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Facilities (P)
     Use For: Complexes; Installations
    Structures (Pb)
         Use For: Buildings
        Structures by building system (Pbc)
            Cast in place structures (Pbca)
            Composite structures (Pbcb)
            Concrete structures (Pbcc)
            Continuous structures (Pbcd)
            Earthquake resistant structures (Pbce)
            Elevated structures (Pbcf)
            Flexible structures (Pbcg)
            Framed structures (Pbch)
                 Use For: Planar structures
            Gravity structures (Pbci)
            Hinged structures (Pbcj)
            Honeycomb structures (Pbck)
                Cellular structures (Pbckl)
            Inflatable structures (Pbcm)
            Modular structures (Pbcn)
                 Use For: Modular construction
            Multistory structures (Pbcp)
                 Use For: High rise construction; Multistorey buildings; Multistory buildings
            Prefabricated structures (Pbcq)
            Rigid structures (Pbcr)
            Steel structures (Pbcs)
            Skewed structures (Pbct)
            Suspended structures (Pbcu)
                Aerial tramways (Pbcud)
                     Related Term (Associative): Cable railroads (Nbbcgp); Wire rope (Rbmdxqrw)
            Tubular structures (Pbcv)
            Web stiffened structures (Pbcw)
            Weldments (Pbcx)
                 Use For: Welded structures
            Wood structures (Pbcy)
            Smart structures (Pbcz)
        Structural parts (Pbp)
             Related Term (Associative): Equipment (Qt)
            Structural members (Pbpb)
                 Related Term (Associative): Materials by shape or form (Rbmdx)
                Arches (Pbpba)
                Ceilings (Pbpbb)
                Chimneys (Pbpbc)
                Conduits (Pbpbd)
                    Ducts (Pbpbdc)
                        Acoustic ducts (Pbpbdcb)
                        Diffusers (Pbpbdce)
                    Open channels (Pbpbdo)
                Floors (Pbpbe)
                Foundations (Pbpbf)
                    Abutments (Pbpbfb)
                         Related Term (Associative): 
                    Anchor walls (Pbpbfd)
                    Anchorages (Pbpbff)
                         Use For: Anchorage (Structures)
                         Related Term (Associative): Bridge anchorages (Pdybbfc)
                    Bedding (Pbpbfh)
                    Floating foundations (Pbpbfj)
                    Footings (Pbpbfk)
                        Isolated footings (Pbpbfkj)
                        Mats (Footings) (Pbpbfkm)
                        Spread footings (Pbpbfks)
                        Strip footings (Pbpbfku)
                    Mat foundations (Pbpbfm)
                         Use For: Raft foundations
                    Mattresses (Foundations) (Pbpbfp)
                    Piers (Supports) (Pbpbfq)
                         Related Term (Associative): Columns (Pbpbvvd); Bridge piers (Pdybbfp)
                    Pile foundations (Pbpbfs)
                    Strip foundations (Pbpbfx)
                Frames (Pbpbg)
                     Related Term (Associative): 
                    Statically determinate frames (Pbpbgd)
                         Use For: Perfect frames; Statically determinate structures
                    Statically indeterminate frames (Pbpbgj)
                         Use For: Redundant frames; Statically indeterminate structures
                Joints (Engineering) (Pbpbh)
                    Backing strips (Pbpbhb)
                    Ball and socket joints (Pbpbhc)
                    Butt joints (Pbpbhd)
                    Construction joints (Pbpbhe)
                    Bolted joints (Pbpbhf)
                    Contraction joints (Pbpbhh)
                    Expansion joints (Pbpbhk)
                         Use For: Isolation joints
                         Related Term (Associative): 
                    Lap joints (Pbpbhp)
                    Longitudinal joints (Pbpbhs)
                    Sawed joints (Pbpbht)
                    Seams (Pbpbhu)
                    Transverse joints (Pbpbhv)
                Lattices (Pbpbj)
                Openings (Pbpbk)
                    Building entrances (Pbpbkb)
                    Building exits (Pbpbkc)
                        Emergency exits (Pbpbkce)
                    Doors (Pbpbkd)
                        Casings (Pbpbkdc)
                    Grilles (Pbpbkg)
                    Vents (Pbpbkv)
                    Windows (Buildings) (Pbpbkw)
                Ramps, corridors and stairs (Pbpbl)
                    Corridors (Pbpblc)
                    Ramps (Pbpblr)
                    Stairs (Pbpbls)
                        Half spaces (Building) (Pbpblsh)
                Rooms (Pbpbm)
                    Basements (Pbpbmb)
                    Control rooms (Pbpbmc)
                    Engine rooms (Pbpbme)
                    Hospital emergency rooms (Pbpbmh)
                Roofs (Pbpbp)
                     Use For: Roofing
                    Domes (Pbpbpd)
                Shells (Structural forms) (Pbpbt)
                     Use For: Shell structures; Structural shells
                Slabs (Pbpbu)
                    Slab on grade (Pbpbus)
                Structural supports (Pbpbv)
                    Bents (Pbpbva)
                         Use For: Bent caps
                    Brackets (Pbpbvb)
                    Breakaway supports (Pbpbvc)
                         Use For: Slip bases
                    Buttresses (Pbpbvd)
                    Concrete forms (Pbpbve)
                        Sliding forms (Pbpbves)
                    Falsework (Pbpbvf)
                        Scaffolds (Pbpbvfs)
                             Related Term (Associative): 
                    Lateral supports (Pbpbvg)
                    Horizontal supports (Pbpbvh)
                        Braces (Pbpbvhb)
                        Stringers (Pbpbvhj)
                        Struts (Pbpbvhu)
                    Tie rods (Pbpbvr)
                    Timbering (Pbpbvt)
                    Vertical supports (Pbpbvv)
                        Beams (Pbpbvvb)
                             Related Term (Associative): 
                            Box beams (Pbpbvvbb)
                            Curved beams (Pbpbvvbc)
                            I beams (Pbpbvvbj)
                            Leaf springs (Pbpbvvbm)
                            T beams (Pbpbvvbt)
                            Thrie beams (Pbpbvvbw)
                            Tiebacks (Pbpbvvby)
                        Cantilevers (Pbpbvvc)
                        Columns (Pbpbvvd)
                             Use For: Pillars
                             Related Term (Associative): Piers (Supports) (Pbpbfq)
                        Girders (Pbpbvvg)
                            Box girders (Pbpbvvgb)
                            Plate girders (Pbpbvvgp)
                        Lagging (Earthwork) (Pbpbvvj)
                        Piles (Supports) (Pbpbvvm)
                             Use For: Pilings
                            Anchor piles (Pbpbvvmb)
                            Batter piles (Pbpbvvmd)
                            Bearing piles (Pbpbvvmg)
                                End bearing piles (Pbpbvvmge)
                                Friction piles (Pbpbvvmgf)
                            Sheet piling (Pbpbvvms)
                                 Use For: Sheet piles
                            Pile groups (Pbpbvvmv)
                            Pile caps (Pbpbvvmw)
                        Poles (Supports) (Pbpbvvp)
                        Posts (Pbpbvvq)
                        Sign supports (Pbpbvvr)
                        Studs (Pbpbvvs)
                            Scantlings (Pbpbvvss)
                        Trusses (Pbpbvvt)
                Walls (Pbpbw)
                    Cutoff walls (Pbpbwc)
                        Grout curtains (Pbpbwcg)
                    Diaphragm walls (Pbpbwd)
                    Parapets (Pbpbwp)
                    Shear walls (Pbpbws)
                    Thin walls (Pbpbwt)
                         Use For: Thin wall structures
                Welds (Pbpbx)
                     Related Term (Associative): Weld strength (Rkmabw)
                    Butt welds (Pbpbxb)
                    Fillet welds (Pbpbxf)
                Structural members by elevation (Pbpby)
                    Substructures (Pbpbyb)
                    Superstructures (Pbpbyp)
            Environmental and sanitary systems in buildings (Pbpv)
                 Related Term (Associative): Heating, cooling and ventilation equipment (Qtpm)
                Air conditioning systems (Pbpvb)
                     Use For: Climate control
                Cooling systems (Pbpvc)
                    Refrigeration systems (Pbpvcr)
                Electrical systems (Pbpve)
                     Use For: Electric systems
                    Electrical wiring (Pbpvew)
                Heating systems (Pbpvh)
                    Electric heating (Pbpvhe)
                Insulation systems (Pbpvj)
                Lighting systems (Pbpvm)
                     Related Term (Associative): Lighting equipment (Qtpn)
                Plumbing systems (Pbpvp)
                    Toilet facilities (Pbpvpt)
                         Use For: Lavatories
                Ventilation systems (Pbpvv)
            Transportation systems in buildings (Pbpy)
                Elevators (Pbpym)
                     Use For: Lifts (Elevators)
                Escalators (Pbpys)
    Specialized facilities (Pd)
        Construction sites (Pdc)
             Use For: Construction zones
            Work zones (Pdcw)
                 Related Term (Associative): Highway maintenance (Fmuh)
        Underground structures (Pdv)
             Use For: Subsurface structures; Underground facilities
             Related Term (Associative): Pipelines (Pmnp); Underground utility lines (Pmptmu); Highway facilities (Pmr)
            Underground parking garages (Pdvp)
            Tunnels (Pdvt)
                 Related Term (Associative): 
                Parts of tunnels (Pdvtb)
                    Tunnel lining (Pdvtbm)
                    Tunnel shafts (Pdvtbr)
                        Crossheadings (Pdvtbrc)
                             Use For: Cross holes
                    Tunnel supports (Pdvtbs)
                        Shields (Tunnels) (Pdvtbss)
                Tunnels by use (Pdvtr)
                    Pedestrian tunnels (Pdvtrn)
                    Pressure tunnels (Pdvtrp)
                    Railroad tunnels (Pdvtrr)
                         Related Term (Associative): Railroad facilities (Pmu)
                        Subways (Pdvtrrs)
                             Use For: Underground railways
                             Related Term (Associative): 
                    Vehicular tunnels (Pdvtrv)
                        Toll tunnels (Pdvtrvt)
            Wells (Pdvw)
        Excavations, mines and oil fields (Pdw)
            Excavations (Pdwe)
                 Use For: Cuts
                Pits (Pdwep)
                Quarries (Pdweq)
                     Related Term (Associative): Aggregates (Rbmddc)
                    Gravel pits (Pdweqg)
                Trenches (Pdwet)
                    Trench backfill (Pdwetb)
                    Slurry trenches (Pdwetw)
            Mines (Pdwm)
                Coal mines (Pdwmc)
            Oil fields (Pdwp)
                Observation wells (Pdwpk)
                Oil pools (Pdwpp)
                     Use For: Oil reservoirs
                Oil wells (Pdwpw)
        Embankments and retaining walls (Pdx)
            Embankments (Pdxe)
                 Use For: Cut slopes; Road embankments; Soil embankments
            Retaining walls (Pdxr)
                 Related Term (Associative): Soil nailing (Fcbysw)
                Crib walls (Pdxrc)
                Earth walls (Pdxre)
                Reinforced concrete retaining walls (Pdxrr)
                Sheet pile walls (Pdxrs)
            Components of embankments and retaining walls (Pdxt)
                Embankment foundations (Pdxte)
                Fills (Pdxtf)
                     Use For: Earth fills
                     Related Term (Associative): Backfilling (Fcfxeeb)
                    Flowable fill (Pdxtff)
                         Use For: Controlled low strength material
                         Related Term (Associative): Soil cement (Rbmdbcs)
                    Hydraulic fills (Pdxtfh)
                    Rockfills (Pdxtfr)
                         Use For: Rock fills
                Relieving platforms (Pdxtr)
        Bridges and culverts (Pdy)
             Related Term (Associative): Highway facilities (Pmr)
            Bridges (Pdyb)
                Bridge members (Pdybb)
                     Use For: Bridge elements
                    Bridge approaches (Pdybbc)
                    Bridge substructures (Pdybbf)
                        Bridge abutments (Pdybbfb)
                        Bridge anchorages (Pdybbfc)
                             Related Term (Associative): Anchorages (Pbpbff)
                        Bridge bearings (Pdybbfe)
                             Use For: Bearings (Bridges)
                             Related Term (Associative): Bearings (Qtbmyd)
                            Bridge bearing pads (Pdybbfep)
                        Bridge foundations (Pdybbff)
                        Bridge piers (Pdybbfp)
                             Use For: Bridge pilings
                             Related Term (Associative): Piers (Supports) (Pbpbfq)
                        Bridge waterways (Pdybbfw)
                    Bridge superstructures (Pdybbs)
                         Use For: Superstructures (Bridge)
                        Bridge cables (Pdybbsc)
                        Bridge decks (Pdybbsf)
                             Use For: Bridge slabs; Bridge surfaces
                        Bridge railings (Pdybbsr)
                             Use For: Bridge rails
                        Bridge towers (Pdybbss)
                Types of bridges (Pdybm)
                    Types of bridges by design (Pdybmd)
                        Arch bridges (Pdybmdb)
                        Cantilever bridges (Pdybmdc)
                            Cable stayed bridges (Pdybmdcc)
                                 Use For: Stayed cable bridges; Stayed girder bridges
                        Covered bridges (Pdybmdd)
                        Curved bridges (Pdybmde)
                        Girder bridges (Pdybmdg)
                            Box girder bridges (Pdybmdgb)
                            Continuous girder bridges (Pdybmdgc)
                                 Use For: Continuous spans
                            Plate girder bridges (Pdybmdgp)
                        Long span bridges (Pdybmdh)
                        Jointless bridges (Pdybmdi)
                             Use For: Integral abutment bridges
                             Related Term (Associative): 
                        Movable bridges (Pdybmdj)
                            Bascule bridges (Pdybmdjb)
                                 Related Term (Associative): 
                            Drawbridges (Pdybmdjd)
                            Lift bridges (Pdybmdjm)
                            Swing bridges (Pdybmdjs)
                        Narrow bridges (Pdybmdm)
                        Pontoon bridges (Pdybmdn)
                             Use For: Floating bridges
                             Related Term (Associative): Floating structures (Pmhyf)
                        Prefabricated bridges (Pdybmdp)
                            Bailey bridges (Pdybmdpb)
                        Skew bridges (Pdybmdr)
                        Suspension bridges (Pdybmds)
                             Related Term (Associative): 
                        Trestles (Pdybmdt)
                        Truss bridges (Pdybmdv)
                        Viaducts (Pdybmdx)
                    Types of bridges by material (Pdybmm)
                        Concrete bridges (Pdybmmc)
                            Prestressed concrete bridges (Pdybmmcp)
                            Reinforced concrete bridges (Pdybmmcr)
                        Metal bridges (Pdybmmm)
                            Steel bridges (Pdybmmms)
                        Masonry bridges (Pdybmmp)
                        Wooden bridges (Pdybmmw)
                             Use For: Timber bridges
                    Types of bridges by use (Pdybmu)
                        Historic bridges (Pdybmuf)
                             Related Term (Associative): History (TCH)
                        Highway bridges (Pdybmuh)
                             Use For: Elevated highways
                            Causeways (Pdybmuhc)
                            Toll bridges (Pdybmuht)
                        Military bridges (Pdybmum)
                        Footbridges (Pdybmup)
                             Use For: Foot bridges; Pedestrian bridges
                             Related Term (Associative): Walkways (Pmrtpw)
                        Railroad bridges (Pdybmur)
                             Use For: Elevated railroads
                             Related Term (Associative): Railroad facilities (Pmu)
                            Elevated guideways (Pdybmurt)
                                 Use For: Elevated mass transit
            Culverts (Pdyr)
                Types of culverts (Pdyrd)
                    Box culverts (Pdyrdb)
                    Concrete culverts (Pdyrdc)
                        Concrete arch culverts (Pdyrdcc)
                        Reinforced concrete culverts (Pdyrdcr)
                    Metal culverts (Pdyrdm)
                        Aluminum culverts (Pdyrdmb)
                        Corrugated metal culverts (Pdyrdmf)
                    Pipe culverts (Pdyrdp)
                        Corrugated pipe culverts (Pdyrdpc)
                Parts of culverts (Pdyru)
                    Culvert inlets (Pdyruj)
                    Culvert outlets (Pdyrup)
            Wildlife crossings (Pdyw)
    Facilities and structures by use (Pf)
        Activity centers (Pfb)
             Use For: Major activity centers
            Kiosks (Pfbk)
                 Related Term (Associative): Traveler information and communication systems (Dsfp)
        Commercial buildings (Pfc)
            Office buildings (Pfcp)
                Data processing centers (Pfcpd)
            Restaurants (Pfcr)
                 Use For: Eating places
                Fast food restaurants (Pfcrf)
                    Drive in restaurants (Pfcrfd)
            Shopping facilities (Pfcs)
                 Use For: Shops
                Convenience stores (Pfcsb)
                Shopping centers (Pfcsc)
                     Use For: Malls; Shopping centres
                    Transit malls (Pfcsct)
        Control centers (Pfd)
            Control centers by function (Pfde)
                Airport control towers (Pfdec)
                Command centers (Pfdeg)
                Radar stations (Pfdep)
                Traffic control centers (Pfder)
                     Use For: Traffic management centers; Traffic operations centers; Transportation management centers
                     Related Term (Associative): Advanced traffic management systems (Dcmthca)
            Parts of control centers (Pfdp)
                Control rooms (Pfdpc)
        Correctional facilities (Pfe)
            Jails (Pfej)
                 Use For: Gaols
            Prisons (Pfep)
        Dwellings (Pff)
             Use For: Houses; Residential buildings
             Related Term (Associative): Housing (Kjf)
            Apartment buildings (Pffb)
            Mobile homes (Pffm)
                 Use For: House trailers
            Single family dwellings (Pffs)
        Health care facilities (Pfg)
             Use For: Medical centers; Medical facilities
            Diagnostic centers (Pfgc)
            Hospitals (Pfgh)
                Hospital emergency rooms (Pfghh)
        Hotels (Pfh)
            Motels (Pfhm)
        Industrial buildings (Pfk)
             Related Term (Associative): Industrial areas (Vwx)
            Factories (Pfkf)
                Mills (Pfkfm)
            Industrial plants (Pfkp)
                 Related Term (Associative): Electric power plants (Pmpp)
                Asphalt plants (Pfkpb)
                     Use For: Drum plants
                Coal gasification plants (Pfkpd)
                     Use For: Demonstration plants; Gas generators
                Coal liquefaction plants (Pfkpe)
                Concrete plants (Pfkpf)
                LNG plants (Pfkph)
                Mixing plants (Pfkpm)
                     Use For: Batch plants
                Petroleum refineries (Pfkpp)
                Pilot plants (Pfkpr)
                Steel plants (Pfkps)
        Maintenance facilities (Pfl)
             Use For: Maintenance structures
        Military facilities (Pfm)
            Command centers (Pfmc)
            Naval shore facilities (Pfmn)
            Radar stations (Pfmr)
        Public buildings (Pfo)
            Theaters (Pfot)
                 Use For: Theatres
        Recreational facilities (Pfq)
            Amusement parks (Pfqb)
                 Use For: Theme parks
            Casinos (Pfqc)
            Parks (Pfqn)
                National parks (Pfqnn)
            Playgrounds (Pfqp)
            Sports facilities (Pfqs)
                Stadiums (Pfqss)
        Research and educational facilities (Pfr)
             Related Term (Associative): Research (Xkb)
            Elementary schools (Pfre)
            Libraries (Pfrk)
                 Related Term (Associative): Information services (Xsj)
            Museums (Pfrl)
            Laboratories (Pfrm)
                 Use For: Testing laboratories
                Test facilities (Pfrmt)
                     Related Term (Associative): Experimental roads (Pmrccpe)
                    Test chambers (Pfrmtt)
                        Anechoic chambers (Pfrmttb)
                    Types of test facilities (Pfrmty)
                        Model basins (Pfrmtym)
                        Proving grounds (Pfrmtyp)
                        Test sections (Pfrmtyt)
                        Water tunnels (Test facilities) (Pfrmtyu)
                        Wind tunnels (Pfrmtyw)
            Universities and colleges (Pfru)
                Campuses (Pfruc)
            High schools (Pfrw)
        Storage facilities (Pfs)
            Grain elevators (Pfsg)
            Repositories (Pfsr)
            Silos (Pfss)
            Storage tanks (Pfst)
            Warehouses (Pfsw)
        Temporary structures (Pft)
        Waste disposal facilities (Pfw)
             Use For: Waste disposal sites
            Junkyards (Pfwj)
                 Use For: Scrap yards
            Landfills (Pfwm)
                Sanitary landfills (Pfwms)
            Radioactive waste facilities (Pfwr)
        Weather stations (Pfx)
        Minor structures (Pfy)
            Fences (Pfyf)
                Snow fences (Pfyfs)
            Garages (Pfyg)
            Gates (Pfyj)
            Shelters (Pfys)
                Windbreaks (Pfysw)
            Towers (Pfyt)
    Transportation, hydraulic and utility facilities (Pm)
        Intermodal facilities (Pme)
            Transportation buildings (Pmeb)
            Transportation corridors (Pmec)
                 Use For: Corridors (Transportation); Traffic corridors
            Intermodal terminals (Pmet)
                 Use For: Depots (Transportation); Terminals (Transportation)
                 Related Term (Associative): 
                Freight terminals (Pmetf)
                    Cargo facilities (Pmetfc)
                        Loading facilities (Pmetfcm)
                        Unloading facilities (Pmetfcu)
                Passenger terminals (Pmetp)
                     Use For: Transportation centers
                     Related Term (Associative): Ferry terminals (Pmhbmpmtg)
            Transit centers (Pmeu)
                Transfer centers (Pmeut)
            Intermodal yards (Pmey)
        Air transportation facilities (Pmf)
             Use For: Aeronautical facilities; Aviation facilities; Civil aviation facilities
            Airports (Pmfc)
                 Use For: Aerodromes
                 Related Term (Associative): Hubs (Bbhead)
                Types of airports (Pmfcb)
                    Air bases (Pmfcbb)
                         Use For: Military airfields
                    General aviation airports (Pmfcbg)
                    Heliports (Pmfcbh)
                    International airports (Pmfcbj)
                    Offshore airports (Pmfcbp)
                         Use For: Floating airports
                         Related Term (Associative): Offshore terminals (Pmhys)
                    Private airports (Pmfcbq)
                    STOL ports (Pmfcbs)
                    Utility airports (Pmfcbu)
                    V/STOL airports (Pmfcbv)
                Airport facilities (Pmfcg)
                    Airport terminals (Pmfcgc)
                         Use For: Terminal flight facilities
                        Aprons (Airports) (Pmfcgcb)
                        Air cargo terminals (Pmfcgcc)
                        Concourses (Airports) (Pmfcgcd)
                        Departure lounges (Pmfcgcf)
                        Aircraft gates (Pmfcgcg)
                        Intra airport transportation facilities (Pmfcgcj)
                            Airbridges (Pmfcgcjc)
                                 Use For: Jetways
                            Mobile lounges (Pmfcgcjm)
                        Airport parking facilities (Pmfcgcp)
                        Satellite terminals (Airports) (Pmfcgcs)
                             Use For: Flight stations; Off airport terminals; Satellite emplaning structures
                        Airport ticket counters (Pmfcgct)
                    Hangars (Pmfcgf)
                    Landing fields (Pmfcgm)
                         Use For: Aircraft landing areas
                        Airport runways (Pmfcgmr)
                             Use For: Airport pavements; Runways (Aeronautics)
                             Related Term (Associative): Airstrips (Pmfk); Pavements (Pmrcpp)
                            Intersecting runways (Pmfcgmrj)
                            Parallel runways (Pmfcgmrp)
                        Taxiways (Pmfcgmt)
            Air traffic control facilities (Pmfg)
                 Use For: Ground stations
                Air route traffic control centers (Pmfgc)
                Airport control towers (Pmfgf)
                Flight service stations (Pmfgs)
            Airstrips (Pmfk)
                 Use For: Landing strips
                 Related Term (Associative): Airport runways (Pmfcgmr)
                Emergency airstrips (Pmfke)
            Landing mats (Pmfl)
            Airways (Pmfm)
        Communication facilities (Pmg)
            Radio stations (Pmgr)
            Telecommuting centers (Pmgt)
        Hydraulic structures (Pmh)
            Harbors (Pmhb)
                 Use For: Harbours
                Types of harbors (Pmhbc)
                    Deepwater harbors (Pmhbcd)
                         Related Term (Associative): Deep draft ships (Qbhww)
                    Marinas (Pmhbcm)
                         Use For: Small craft harbors
                Components of harbors (Pmhbm)
                    Ports (Pmhbmp)
                        Types of ports (Pmhbmpc)
                            River ports (Pmhbmpcm)
                                 Use For: Inland ports; Inland terminals
                            Seaports (Pmhbmpcp)
                            Superports (Pmhbmpcs)
                                 Use For: World ports
                        Port structures (Pmhbmpm)
                            Wharves (Pmhbmpmb)
                                Types of wharves (Pmhbmpmbd)
                                    Quays (Pmhbmpmbdf)
                                    Piers (Wharves) (Pmhbmpmbdr)
                                Wharf components (Pmhbmpmbr)
                                    Aprons (Wharves) (Pmhbmpmbrb)
                                    Berthing facilities (Pmhbmpmbrf)
                                    Bollards (Pmhbmpmbrg)
                                    Fenders (Wharves) (Pmhbmpmbrj)
                                         Use For: Dock fenders
                                    Gantry cranes (Pmhbmpmbrm)
                                    Dolphins (Piles) (Pmhbmpmbrr)
                                    Waterfront structures (Pmhbmpmbrt)
                                        Transit sheds (Wharves) (Pmhbmpmbrtt)
                            Docks (Pmhbmpmf)
                                Drydocks (Pmhbmpmfd)
                                     Use For: Dry docks; Graving docks
                                Floating docks (Pmhbmpmff)
                            Moorings (Pmhbmpmm)
                                Mooring buoys (Pmhbmpmmb)
                                Offshore moorings (Pmhbmpmmd)
                                     Use For: Deep sea moorings
                                Single point moorings (Pmhbmpmmp)
                                     Use For: Spm mooring systems
                            Marine terminals (Pmhbmpmt)
                                 Use For: Port terminals
                                Bulk cargo terminals (Pmhbmpmtb)
                                Coal terminals (Pmhbmpmtd)
                                Container terminals (Pmhbmpmtf)
                                     Use For: Container ports
                                Ferry terminals (Pmhbmpmtg)
                                     Related Term (Associative): ; Passenger terminals (Pmetp)
                                Grain terminals (Pmhbmpmth)
                                LASH terminals (Pmhbmpmtj)
                                LNG terminals (Pmhbmpmtm)
                                Offshore terminals (Pmhbmpmtp)
                                Ore terminals (Pmhbmpmtq)
                                Petroleum terminals (Pmhbmpmtr)
                                     Use For: Tanker terminals
                                VLCC ports (Pmhbmpmtv)
                    Shipyards (Pmhbmy)
            Coast and river protective works (Pmhd)
                 Use For: Bank protective works; Coastal structures; River protective works; Shore protective works
                Berms (Pmhdb)
                Breakwaters (Pmhdc)
                    Floating breakwaters (Pmhdcf)
                    Rubble mound breakwaters (Pmhdcr)
                Bulkheads (Hydraulics) (Pmhdd)
                Dikes (Pmhdh)
                    Spur dikes (Pmhdhs)
                Groins (Hydraulics) (Pmhdj)
                Jetties (Pmhdk)
                Levees (Pmhdm)
                Polders (Pmhdp)
                Revetments (Pmhdr)
                Riprap (Pmhdt)
                Sea walls (Pmhdv)
            Lighthouses (Pmhe)
            Canals and waterways (Pmhj)
                Canals (Pmhjc)
                    Interoceanic canals (Pmhjcj)
                Waterways (Pmhjw)
                    Inland waterways (Pmhjwj)
                    Intracoastal waterways (Pmhjwn)
                Parts of canals and waterways (Pmhjy)
                    Banks (Waterways) (Pmhjyb)
                         Use For: Riverbanks; Streambanks
                    Canal linings (Pmhjyd)
                    Channels (Waterways) (Pmhjye)
                        Benching (Pmhjyeb)
                        Channel linings (Pmhjyem)
                        Streambeds (Pmhjyes)
                             Use For: Riverbeds
                    Flumes (Pmhjyh)
                    Locks (Waterways) (Pmhjyn)
                        Lock chambers (Pmhjync)
                        Lock gates (Pmhjyng)
                        Lift gates (Locks) (Pmhjynm)
                    Stilling basins (Pmhjys)
                    Substrates (Waterways) (Pmhjyu)
            Dams (Pmhm)
                Types of dams (Pmhmb)
                    Arch dams (Pmhmbb)
                    Cofferdams (Pmhmbc)
                    Concrete dams (Pmhmbd)
                    Earth dams (Pmhmbe)
                    Gravity dams (Pmhmbg)
                    Rockfill dams (Pmhmbr)
                    Weirs (Pmhmbw)
                Parts of dams (Pmhmr)
                    Dam foundations (Pmhmrf)
                    Fish ladders (Pmhmrh)
                    Sluices (Pmhmrm)
                    Spillways (Pmhmrp)
            Irrigation and drainage structures (Pmhp)
                Drainage structures (Pmhpd)
                    Catch basins (Pmhpdb)
                    Detention basins (Pmhpdc)
                         Use For: Storm water retention basins; Stormwater retention basins
                         Related Term (Associative): Groundwater recharge (Jbhvr)
                    Ditches (Pmhpdd)
                         Use For: Channels (Drainage)
                    Drainage canals (Pmhpde)
                    Drains (Pmhpdf)
                        Edge drains (Pmhpdfe)
                        Filter drains (Pmhpdff)
                        Horizontal drains (Pmhpdfh)
                        Sand drains (Pmhpdfr)
                        Subdrains (Pmhpdfs)
                             Use For: Subsurface drains; Underdrains
                        Vertical drains (Pmhpdfv)
                        Wick drains (Pmhpdfx)
                    Drainage basins (Pmhpdh)
                         Use For: Water catchment areas
                         Related Term (Associative): Watersheds (Vmw)
                    Drainage blankets (Pmhpdj)
                    Grates (Pmhpdm)
                    Gutters (Pmhpdp)
                    Manholes (Pmhpdq)
                         Use For: Sewer access holes; Utility access holes
                    Sewers (Pmhpds)
                        Storm sewers (Pmhpdss)
                             Use For: Storm drains
                    Sumps (Pmhpdu)
                    Swales (Pmhpdv)
                Irrigation structures (Pmhpj)
                    Irrigation canals (Pmhpjj)
                    Laterals (Irrigation) (Pmhpjm)
            Water supply and distribution structures (Pmhs)
                Water supply structures (Pmhsf)
                    Aqueducts (Pmhsfb)
                    Desalination plants (Pmhsff)
                         Use For: Desalting plants
                    Reservoirs (Pmhsfr)
                    Water pipelines (Pmhsft)
                        Piping systems (Pmhsftp)
                    Water tunnels (Pmhsfw)
                    Water wells (Pmhsfy)
                Water distribution structures (Pmhsm)
                    Water mains (Pmhsmf)
                    Water towers (Pmhsmn)
                    Waterworks (Pmhsmt)
                         Use For: Water works
            Sewerage structures (Pmhv)
                 Use For: Sanitary facilities
                Sewage holding tanks (Pmhvs)
                Sewage treatment plants (Pmhvt)
                Sanitary sewers (Pmhvu)
            Offshore structures (Pmhy)
                 Use For: Deep water structures
                Caissons (Pmhyc)
                Floating structures (Pmhyf)
                     Related Term (Associative): Pontoon bridges (Pdybmdn)
                Moored structures (Pmhym)
                Offshore platforms (Pmhyp)
                     Use For: Ocean platforms
                    Offshore drilling platforms (Pmhypd)
                         Use For: Drilling platforms
                Offshore power plants (Pmhyq)
                     Use For: Floating power plants
                Offshore terminals (Pmhys)
                     Related Term (Associative): Offshore airports (Pmfcbp)
                Underwater structures (Pmhyu)
                    Underwater foundations (Pmhyuf)
                    Underwater pipelines (Pmhyup)
                         Use For: Offshore pipelines; Submarine pipelines
                    Underwater tunnels (Pmhyut)
                         Use For: Subaqueous tunnels
        Pipeline facilities (Pmn)
            Pipelines (Pmnp)
                 Use For: Pipe lines
                 Related Term (Associative): Underground structures (Pdv)
                Pipelines by product carried (Pmnpp)
                    Capsule pipelines (Pmnppb)
                         Use For: Tube transportation
                         Related Term (Associative): Pneumatic conveyors (Qtphep)
                    Coal pipelines (Pmnppc)
                    Gas pipelines (Pmnppg)
                        Natural gas pipelines (Pmnppgn)
                            LNG pipelines (Pmnppgnm)
                    Petroleum pipelines (Pmnppp)
                    Slurry pipelines (Pmnpps)
                    Sulfur pipelines (Pmnppu)
                         Use For: Sulphur pipelines
                    Water pipelines (Pmnppw)
                Pipelines by location (Pmnpt)
                    Underwater pipelines (Pmnptu)
                         Use For: Offshore pipelines; Submarine pipelines
            Pipeline pumping stations (Pmns)
        Electric utility facilities (Pmp)
            Electric power plants (Pmpp)
                 Use For: Power plants
                 Related Term (Associative): Industrial plants (Pfkp)
                Combined cycle power plants (Pmppc)
                Fossil fuel power plants (Pmppf)
                Geothermal power plants (Pmppg)
                Hydroelectric plants (Pmpph)
                Nuclear power plants (Pmppn)
                Offshore power plants (Pmppp)
                     Use For: Floating power plants
                Solar power plants (Pmpps)
                Steam power plants (Pmppt)
                Tidal power plants (Pmppu)
                Thermal power plants (Pmppv)
                     Use For: Ocean thermal power plants
                    Cooling towers (Pmppvc)
            Electric power transmission facilities (Pmpt)
                Transmission lines (Pmptm)
                     Use For: Electric lines; Electric transmission lines; Power lines; Telephone lines
                     Related Term (Associative): Contact wire (Pmuc)
                    Grids (Transmission lines) (Pmptmg)
                         Use For: Grid systems
                    Overhead utility lines (Pmptmp)
                    Underground utility lines (Pmptmu)
                         Related Term (Associative): Underground structures (Pdv)
                Utility poles (Pmptp)
                     Use For: Electric utility poles
                Electric substations (Pmpts)
                     Use For: Substations
                Electric transmission towers (Pmptt)
            Street lighting (Pmpv)
                 Use For: Highway lighting; Roadway lighting
                 Related Term (Associative): ; Lighting equipment (Qtpn)
                Lighting columns (Pmpvc)
                     Use For: Lighting standards
                    High mast lighting (Pmpvch)
                Luminaires (Pmpvm)
        Highway facilities (Pmr)
             Related Term (Associative): Underground structures (Pdv); Bridges and culverts (Pdy)
            Roads (Pmrc)
                Types of roads (Pmrcc)
                    Principal types of roads (Pmrccd)
                        Alleys (Pmrccdb)
                        Expressways (Pmrccde)
                             Use For: Express highways; Limited access highways
                        Freeways (Pmrccdf)
                             Use For: Controlled access highways; Motorways
                        Highways (Pmrccdh)
                            Arterial highways (Pmrccdhb)
                                 Use For: Arterial streets; Boulevards; Main roads; Thorofares; Thoroughfares; Through highways
                            Depressed highways (Pmrccdhc)
                            Divided highways (Pmrccdhd)
                                 Use For: Dual carriageways; Dual highways
                        Streets (Pmrccds)
                             Use For: City streets
                            Cul de sacs (Pmrccdsc)
                            Dead end streets (Pmrccdsd)
                            One way streets (Pmrccdsp)
                    Types of roads by environment (Pmrcce)
                        Forest roads (Pmrccef)
                        Mountain roads (Pmrccem)
                        Parkways (Pmrccep)
                        Rural highways (Pmrccer)
                        Scenic highways (Pmrcces)
                             Use For: Scenic byways; Scenic corridors
                             Related Term (Associative): Scenic easements (Cqegs)
                        Urban highways (Pmrcceu)
                             Related Term (Associative): 
                    Types of roads by jurisdiction (Pmrccj)
                        County roads (Pmrccjc)
                        Federal aid highways (Pmrccjf)
                        International roads (Pmrccjj)
                        Interstate highways (Pmrccjm)
                        Primary highways (Pmrccjp)
                             Use For: Trunk roads
                        Private roads (Pmrccjq)
                            Driveways (Pmrccjqd)
                                 Related Term (Associative): Access control (Transportation) (Cqea)
                        Public roads (Pmrccjr)
                        Secondary roads (Pmrccjs)
                        State highways (Pmrccjt)
                        Toll roads (Pmrccjv)
                             Related Term (Associative): ; Road pricing (Cfspr)
                    Types of roads by number of lanes (Pmrcck)
                        Two lane highways (Pmrcckb)
                             Use For: Two lane roads
                             Related Term (Associative): 
                        Three lane highways (Pmrcckf)
                        Four lane highways (Pmrcckm)
                        Multilane highways (Pmrcckr)
                    Types of roads by network (Pmrccn)
                        Access roads (Pmrccnb)
                             Related Term (Associative): 
                            Frontage roads (Pmrccnbf)
                        Approach roads (Pmrccnd)
                             Use For: Slip roads
                        Beltways (Pmrccnf)
                             Use For: Belt highways; Circumferential highways; Loops (Highways); Ring roads
                        Bypasses (Pmrccnj)
                        Highway corridors (Pmrccnm)
                             Use For: Traffic corridors
                        Radial highways (Pmrccnr)
                    Types of roads by purpose (Pmrccp)
                        Automated highways (Pmrccpb)
                             Use For: Automatic highways; Electronic roads; Intelligent highways; Smart highways; Smart roads
                             Related Term (Associative): Advanced vehicle control systems (Dcmvgyc)
                        Commercial strips (Pmrccpc)
                        Experimental roads (Pmrccpe)
                             Related Term (Associative): Test facilities (Pfrmt)
                            Test tracks (Pmrccpet)
                                Circular test tracks (Pmrccpetc)
                        Farm roads (Pmrccpf)
                             Use For: Agricultural roads
                        Haul roads (Pmrccph)
                        Logging roads (Pmrccpk)
                        Recreational roads (Pmrccpp)
                        Residential streets (Pmrccpr)
                        Service roads (Pmrccps)
                             Related Term (Associative): 
                    Unpaved roads (Pmrccu)
                        Earth roads (Pmrccue)
                             Use For: Dirt roads
                        Gravel roads (Pmrccug)
                    Types of roads by traffic volume (Pmrccv)
                        High volume roads (Pmrccvh)
                             Use For: High traffic roads
                        Low volume roads (Pmrccvm)
                Geometric segments (Pmrck)
                    Highway curves (Pmrckc)
                         Use For: Bends (Roads); Road curves
                        Transition curves (Pmrckct)
                             Use For: Easement curves
                    Highway grades (Pmrckg)
                         Use For: Grades (Roads)
                        Downgrades (Roads) (Pmrckgd)
                        Upgrades (Roads) (Pmrckgu)
                Parts of roads (Pmrcp)
                    Barriers (Roads) (Pmrcpb)
                         Related Term (Associative): Barricades (Qtpsb)
                        Anti glare screens (Pmrcpbc)
                             Use For: Anti dazzle screens; Glare screens
                        Crash cushions (Pmrcpbe)
                             Use For: Impact attenuators
                            Truck mounted attenuators (Pmrcpbet)
                        Guardrails (Pmrcpbg)
                             Use For: Guard fences; Guard rails; Guiderails
                            Guardrail terminals (Pmrcpbgt)
                            Guardrail transition sections (Pmrcpbgv)
                        Medians (Pmrcpbm)
                             Use For: Central reserves; Median strips
                            Median barriers (Pmrcpbmb)
                            Median openings (Pmrcpbmp)
                        Noise barriers (Pmrcpbn)
                             Use For: Sound barriers; Traffic noise barriers
                    Curbs (Pmrcpc)
                         Use For: Kerbs
                    Interchanges and intersections (Pmrcpj)
                         Related Term (Associative): Crosswalks (Pmrtpc); Railroad grade crossings (Pmuj)
                        Intersections (Pmrcpjf)
                             Use For: Cross roads; Junctions (Traffic)
                            Types of intersections (Pmrcpjfc)
                                At grade intersections (Pmrcpjfcb)
                                     Use For: Grade crossings (Highways)
                                Channelized intersections (Pmrcpjfcd)
                                Four leg intersections (Pmrcpjfcf)
                                Offset intersections (Pmrcpjfcg)
                                Signalized intersections (Pmrcpjfch)
                                     Use For: Signalised intersections
                                    Isolated intersections (Pmrcpjfchi)
                                T intersections (Pmrcpjfcj)
                                     Use For: T junctions
                                Traffic circles (Pmrcpjfcm)
                                     Use For: Circular intersections; Gyratory intersections; Rotary intersections
                                    Roundabouts (Pmrcpjfcmr)
                                         Use For: Modern roundabouts
                                Three leg intersections (Pmrcpjfcp)
                                Unchannelized intersections (Pmrcpjfcr)
                                Unsignalized intersections (Pmrcpjfct)
                                     Use For: Uncontrolled intersections; Uncontrolled junctions
                                     Related Term (Associative): ; 
                                Y intersections (Pmrcpjfcv)
                                     Use For: Bifurcates (Intersections); Fork junctions
                            Intersection elements (Pmrcpjfr)
                                Dilemma zone (Pmrcpjfrd)
                                     Related Term (Associative): ; Yellow interval (Traffic signal cycle) (Dcmthcskjy); Reaction time (Mxrra)
                                Gore area (Pmrcpjfrf)
                                Grade separations (Pmrcpjfrj)
                                    Overpasses (Pmrcpjfrjp)
                                         Use For: Flyovers
                                    Underpasses (Pmrcpjfrju)
                                Traffic islands (Pmrcpjfrt)
                                     Related Term (Associative): 
                        Interchanges (Pmrcpjs)
                            Types of interchanges (Pmrcpjsc)
                                Cloverleaf interchanges (Pmrcpjscc)
                                Diamond interchanges (Pmrcpjscd)
                                    Single point urban interchanges (Pmrcpjscds)
                                Trumpet interchanges (Pmrcpjsct)
                            Interchange elements (Pmrcpjsr)
                                Merging area (Pmrcpjsrm)
                                     Related Term (Associative): Merging control (Dcmvgp)
                                Ramps (Interchanges) (Pmrcpjsrr)
                                     Use For: Ramp freeway junctions
                                    Off ramps (Pmrcpjsrrf)
                                         Use For: Exit ramps
                                    On ramps (Pmrcpjsrrn)
                                         Use For: Entrance ramps
                    Traffic lanes (Pmrcpm)
                         Use For: Carriageways; Roadway; Traveled way
                        Approach lanes (Pmrcpma)
                        Auxiliary lanes (Pmrcpmb)
                        Bicycle lanes (Pmrcpmc)
                             Related Term (Associative): 
                        General purpose lanes (Pmrcpmd)
                        Climbing lanes (Pmrcpme)
                             Use For: Creeper lanes
                        Contraflow lanes (Pmrcpmg)
                        Downgrade lanes (Pmrcpmh)
                        Express lanes (Pmrcpmi)
                        High occupancy vehicle lanes (Pmrcpmj)
                             Use For: Carpool lanes; Diamond lanes; HOV lanes; Priority lanes
                            Bus lanes (Pmrcpmjb)
                            High occupancy toll lanes (Pmrcpmjh)
                                 Use For: HOT lanes
                                 Related Term (Associative): Road pricing (Cfspr)
                        Lane drops (Pmrcpmk)
                        Managed lanes (Pmrcpml)
                        Median lanes (Pmrcpmm)
                        Reversible traffic lanes (Pmrcpmr)
                        Speed change lanes (Pmrcpmt)
                            Acceleration lanes (Pmrcpmtb)
                            Deceleration lanes (Pmrcpmtd)
                            Passing lanes (Pmrcpmtp)
                        Truck lanes (Pmrcpmv)
                        Turning lanes (Pmrcpmx)
                            Left turn lanes (Pmrcpmxm)
                                Two way left turn lanes (Pmrcpmxmt)
                            Right turn lanes (Pmrcpmxr)
                    Pavements (Pmrcpp)
                         Related Term (Associative): Airport runways (Pmfcgmr)
                        Types of pavements (Pmrcppb)
                            Reclaimed asphalt pavements (Pmrcppbc)
                            Types of pavements by surface load distribution (Pmrcppbd)
                                Flexible pavements (Pmrcppbdf)
                                Rigid pavements (Pmrcppbdr)
                            Types of pavements by material (Pmrcppbm)
                                Asphalt pavements (Pmrcppbmb)
                                    Full-depth asphalt pavements (Pmrcppbmbf)
                                         Related Term (Associative): Perpetual pavements (Pmrcppbr)
                                Asphalt concrete pavements (Pmrcppbmd)
                                     Use For: Asphaltic concrete pavements
                                Bituminous pavements (Pmrcppbmf)
                                     Related Term (Associative): ; ; 
                                Bituminous concrete pavements (Pmrcppbmh)
                                Brick pavements (Pmrcppbmj)
                                Composite pavements (Pmrcppbmk)
                                     Related Term (Associative): 
                                Concrete pavements (Pmrcppbmm)
                                    Precast concrete pavements (Pmrcppbmmn)
                                         Use For: Block pavements
                                    Prestressed concrete pavements (Pmrcppbmmp)
                                    Reinforced concrete pavements (Pmrcppbmmr)
                                        Continuously reinforced concrete pavements (Pmrcppbmmrc)
                                             Use For: CRCP
                                    Roller compacted concrete pavements (Pmrcppbmms)
                                Mosaic pavements (Pmrcppbmp)
                                Soil cement pavements (Pmrcppbms)
                                Wooden pavements (Pmrcppbmw)
                                     Use For: Plank roads
                            Porous pavements (Pmrcppbp)
                                 Use For: Porous asphalt; Porous concrete
                            Perpetual pavements (Pmrcppbr)
                                 Use For: Long life pavements
                                 Related Term (Associative): Zero maintenance systems (Fmmz); Full-depth asphalt pavements (Pmrcppbmbf)
                        Pavement components (Pmrcppp)
                            Pavement joints (Pmrcpppj)
                            Pavement layers (Pmrcpppm)
                                Surface course (Pavements) (Pmrcpppmb)
                                     Use For: Blanket course; Road surfaces
                                     Related Term (Associative): Tire/pavement noise (Jfnbtt)
                                    Binder course (Pmrcpppmbb)
                                    Friction course (Pmrcpppmbf)
                                    Overlays (Pavements) (Pmrcpppmbp)
                                         Use For: Overlay course
                                        Bituminous overlays (Pmrcpppmbpb)
                                             Use For: Asphalt overlays
                                        Concrete overlays (Pmrcpppmbpc)
                                            Whitetopping (Pmrcpppmbpcp)
                                    Seal coats (Pmrcpppmbs)
                                         Use For: Surface dressing; Surface finish; Waterproofing course
                                    Wearing course (Pavements) (Pmrcpppmbw)
                                    Surface course irregularities (Pmrcpppmby)
                                         Related Term (Associative): Pavement cracking (Smfdp)
                                        Potholes (Pavements) (Pmrcpppmbyp)
                                             Use For: Chuckholes
                                        Ruts (Pavements) (Pmrcpppmbyr)
                                             Use For: Wheeltracks
                                             Related Term (Associative): Rutting (Smbr)
                                Base course (Pavements) (Pmrcpppme)
                                     Use For: Pavement bases; Roadbase
                                     Related Term (Associative): ; 
                                    Bituminous bases (Pmrcpppmeb)
                                    Concrete bases (Pmrcpppmec)
                                    Granular bases (Pmrcpppmeg)
                                Subbase (Pavements) (Pmrcpppmg)
                                Pavement interlayers (Pmrcpppmi)
                                Subgrade (Pavements) (Pmrcpppmr)
                                     Use For: Highway subgrade; Pavement subgrades; Roadbeds
                    Roadside (Pmrcpr)
                         Related Term (Associative): 
                        Clear zones (Pmrcprc)
                             Use For: Roadside recovery areas
                             Related Term (Associative): ; Backslopes (Vgfhsb); Foreslopes (Vgfhsf)
                        Roadside memorials (Pmrcprm)
                             Related Term (Associative): Traffic crash victims (Mswvat)
                        Roadside structures (Pmrcprs)
                            Mailboxes (Pmrcprsm)
                    Road shoulders (Pmrcps)
                         Use For: Shoulders (Roads); Verge
                         Related Term (Associative): Backslopes (Vgfhsb); Foreslopes (Vgfhsf)
                        Paved shoulders (Pmrcpsp)
                             Use For: Hard shoulders
                        Dropoffs (Pavements) (Pmrcpsw)
                    Weaving sections (Pmrcpw)
            Highway facilities for nonmotorized users (Pmrt)
                Bicycle facilities (Pmrtc)
                     Related Term (Associative): Bicycle parking (Brddx)
                    Bicycle crossings (Pmrtcc)
                         Related Term (Associative): 
                    Bicycle lanes (Pmrtcg)
                         Related Term (Associative): 
                    Bikeways (Pmrtcm)
                         Use For: Bicycle paths; Bicycle routes; Bicycle trails; Cycle tracks; Cycling paths
                         Related Term (Associative): 
                Pedestrian areas (Pmrtp)
                     Use For: Auto free zones; Pedestrian facilities; Pedestrian precinct; Pedestrian trafficways; Traffic free zones
                    Crosswalks (Pmrtpc)
                         Use For: High intensity activated crosswalk (HAWK); High-Intensity Activated Crosswalk; Pedestrian crossings
                         Related Term (Associative): Interchanges and intersections (Pmrcpj)
                        School crossings (Pmrtpcd)
                             Related Term (Associative): 
                        Midblock crossings (Pmrtpck)
                        Panda crossings (Pmrtpcp)
                        Zebra crossings (Pmrtpcz)
                    Moving sidewalks (Pmrtpm)
                         Use For: Moving pavement
                    Pedestrian malls (Pmrtpp)
                         Use For: Pedestrian streets
                    Sidewalks (Pmrtps)
                         Use For: Pavement (Sidewalks)
                    Trails (Pmrtpt)
                    Walkways (Pmrtpw)
                         Use For: Footways; Paths; Pedestrian walkways; Walks
                         Related Term (Associative): Footbridges (Pdybmup)
            Highway facilities for motorized users (Pmru)
                Bus and high occupancy vehicle facilities (Pmrub)
                     Related Term (Associative): 
                    Bus garages (Pmrubg)
                    Bus lanes (Pmrubm)
                    Bus stops (Pmrubs)
                         Use For: Stop (Public transportation)
                        Bus bays (Pmrubsb)
                             Use For: Bus berths; Lay bys
                        Farside (Bus stops) (Pmrubsk)
                        Nearside (Bus stops) (Pmrubsn)
                        Bus stop shelters (Pmrubss)
                    Bus terminals (Pmrubt)
                         Use For: Bus stations
                    Busways (Pmrubw)
                         Related Term (Associative): Guided buses (Qbddhpbkq)
                    High occupancy vehicle lanes (Pmruby)
                         Use For: Carpool lanes; HOV lanes
                Inspection stations (Pmruj)
                Parking facilities (Pmrup)
                     Use For: Car parks; Parking areas; Parking places
                    Parking garages (Pmrupg)
                        Underground parking garages (Pmrupgu)
                             Related Term (Associative): 
                    Parking lots (Pmrupm)
                Roadside rest areas (Pmruq)
                     Use For: Rest areas
                Service stations (Pmrur)
                     Related Term (Associative): Truck stops (Pmruus)
                Toll facilities (Pmrus)
                    Toll booths (Pmrusb)
                    Toll plazas (Pmrusp)
                Traffic control centers (Pmrut)
                     Use For: Traffic management centers; Traffic operations centers
                Truck facilities (Pmruu)
                    Escape lanes (Pmruue)
                         Use For: Truck escape ramps
                        Arrester beds (Pmruueb)
                    Truck lanes (Pmruuk)
                    Truck loading facilities (Pmruum)
                    Truck stops (Pmruus)
                         Related Term (Associative): Service stations (Pmrur)
                    Truck terminals (Pmruut)
                    Weigh stations (Pmruuw)
                        Motor vehicle scales (Pmruuws)
                        Weigh in motion scales (Pmruuww)
                Turnouts (Pmruv)
        Railroad facilities (Pmu)
             Related Term (Associative): Railroad tunnels (Pdvtrr); Railroad bridges (Pdybmur)
            Contact wire (Pmuc)
                 Use For: Trolley wire
                 Related Term (Associative): Transmission lines (Pmptm)
                Catenaries (Railroads) (Pmucc)
            Railroad tracks (Pmud)
                 Use For: Tracks
                Types of track (Pmudb)
                    Ballastless track (Pmudbb)
                    Curved track (Pmudbc)
                    Concrete slab track (Pmudbe)
                    Double track (Pmudbf)
                    Guideways (Pmudbg)
                    High speed track (Pmudbh)
                    Jointed track (Pmudbj)
                    Multiple track (Pmudbm)
                    Narrow gage track (Pmudbn)
                    Single track (Pmudbs)
                    Tangent track (Pmudbt)
                    Track panels (Pmudbv)
                    Unconventional track (Pmudbx)
                Lines of track (Pmude)
                    Branch lines (Pmudeb)
                    Main lines (Pmudem)
                Track components (Pmudk)
                    Ballast crib (Pmudkb)
                    Crossovers (Pmudkd)
                    Frogs (Railroads) (Pmudkh)
                    Rail (Railroads) (Pmudkr)
                         Use For: Railroad rails
                        Types of railroad rail (Pmudkrb)
                            Curved rail (Pmudkrbb)
                            Continuous welded rail (Pmudkrbc)
                                 Use For: Continuous rail; CWR
                            Corrugated rail (Pmudkrbd)
                            Heat treated rail (Pmudkrbh)
                            Reaction rails (Pmudkrbr)
                            Steel rails (Pmudkrbs)
                            Third rail (Pmudkrbt)
                            Welded rail (Pmudkrbw)
                        Rail components (Pmudkrk)
                            Rail joints (Pmudkrkj)
                            Railhead (Pmudkrkr)
                    Sidings (Railroads) (Pmudks)
                    Switches (Railroads) (Pmudkt)
                         Use For: Switchgear
                    Railroad ties (Pmudku)
                         Use For: Cross ties; Sleepers; Ties
                        Concrete ties (Pmudkuc)
                            Prestressed concrete ties (Pmudkucp)
                        Steel ties (Pmudkus)
                        Wood ties (Pmudkuw)
                    Tie pads (Pmudkv)
                    Tie plates (Pmudkw)
                    Turnouts (Pmudkx)
            Railroad grade crossings (Pmuj)
                 Use For: Grade crossings; Highway rail intersections; Highway railroad grade crossings; Level crossings
                 Related Term (Associative): Interchanges and intersections (Pmrcpj); Light rail transit grade crossings (Pmuyc)
                Grade crossing surfaces (Pmujs)
            Railroad buildings (Pmur)
                Railroad stations (Pmurp)
                    Rail transit stations (Pmurpr)
                        Subway stations (Pmurprs)
                Railroad terminals (Pmurt)
                Railroad maintenance facilities (Pmurv)
                    Car shops (Railroads) (Pmurvc)
                    Locomotive shops (Pmurvm)
                    Wheel shops (Railroads) (Pmurvw)
            Railroad yards (Pmut)
                Classification yards (Pmutc)
                    Hump yards (Pmutch)
            Rail transit facilities (Pmuy)
                 Use For: Rapid transit facilities
                Light rail transit grade crossings (Pmuyc)
                     Related Term (Associative): Railroad grade crossings (Pmuj)
                Guideways (Pmuyg)
                     Use For: Transitways
                    Line extensions (Rail transit) (Pmuyge)
                         Use For: Rapid transit extensions
                Rail transit stations (Pmuys)
                     Related Term (Associative): Transit oriented development (Epdrdt)
                    Subway stations (Pmuyss)
    Structural deterioration and defects (Pt)
         Related Term (Associative): Pavement distress (Estyd)
        Deterioration (Pte)
             Related Term (Associative): ; Deterioration by environmental action (Jby); Corrosion (Scph)
            Aging (Materials) (Pteb)
                 Use For: Ageing (Materials)
            Wear (Ptew)
                 Related Term (Associative): 
        Defects (Ptq)
             Use For: Flaws; Irregularities
             Related Term (Associative): Deformation (Smb); Failure (Smf)

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