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Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Automation (Dcb)
             Use For: Automated control systems
        Control systems (Dcg)
             Use For: Computer control systems; Computerized control systems
            Actuating systems (Dcga)
            Adaptive control (Dcgb)
                 Use For: Adaptive systems
                 Related Term (Associative): 
                Self organizing systems (Dcgbs)
                     Use For: Self adjusting systems; Self optimizing systems
            Automatic control (Dcgc)
                 Related Term (Associative): Cybernetics (Ttec)
            Command and control systems (Dcgd)
            Electronic control (Dcge)
                 Related Term (Associative): Electronic equipment (Qtbe)
            Feedback control (Dcgf)
                 Use For: Closed loop control systems
            Fluidics (Dcgh)
            Integrated systems (Dcgi)
                 Use For: Integrated control systems
            Intelligent control systems (Dcgj)
            Kalman filtering (Dcgk)
            Linear systems (Dcgl)
                Linear control systems (Dcglm)
            Manual control (Dcgm)
            Nonlinear systems (Dcgn)
            Numerical control (Dcgp)
            Process control (Dcgr)
                Distributed control (Dcgrd)
                Feedforward control (Dcgrf)
            Real time control (Dcgt)
            Remote control (Dcgu)
                Radio control (Dcgur)
            Sliding mode control (Dcgw)
                 Use For: Variable structure systems
        Properties of control systems (Dch)
            Equilibrium (Systems) (Dche)
                 Use For: Network equilibrium
            Fault tolerance (Dchg)
            Interoperability (Dchh)
                 Related Term (Associative): Standards (Xxss)
            Hysteresis (Dchi)
            Linearity (Dchm)
            Sensitivity (Dchp)
            Stability criteria (Dchr)
            Systems availability (Dchs)
            Transfer functions (Dcht)
        Control devices (Dcj)
             Use For: Control equipment; Control system hardware
             Related Term (Associative): Equipment (Qt); Electronic equipment (Qtbe)
            Actuators (Dcja)
            Automatic controllers (Dcjb)
                 Use For: Controllers (Automatic control equipment)
                Fuzzy controllers (Dcjbf)
            Control consoles (Dcjd)
                Control panels (Dcjdd)
            Loops (Control systems) (Dcjm)
                 Use For: Control loops
            Permanent magnets (Dcjp)
                 Use For: Magnetic nails
                 Related Term (Associative): Roadway guidance markers (Dcnsyhr)
            Robots (Dcjr)
                Mobile robots (Dcjrm)
                     Related Term (Associative): Trajectory control (Dcmvr)
            Servomechanisms (Dcjs)
                Servomotors (Dcjss)
            Thyristors (Dcjt)
            Timers (Dcju)
        Control system applications (Dcm)
            Electronic funds transfer (Dcmc)
                 Related Term (Associative): Rate, fare and toll collection (Bbkx)
                Automated toll collection (Dcmcb)
                     Use For: Electronic toll and traffic management; Electronic toll collection; ETTM; Freeflow tolling
                     Related Term (Associative): Automatic vehicle identification (Dmbyvj)
                Automatic fare collection (Dcmcf)
                     Related Term (Associative): Smart cards (Dcmcrs)
                Electronic payment (Parking) (Dcmcp)
                     Related Term (Associative): Pay parking (Brddp)
                Automated accounting equipment (Dcmcr)
                    Magnetic farecards (Dcmcrm)
                    Smart cards (Dcmcrs)
                         Use For: Chip cards; Contactless fare cards; Integrated circuit cards
                         Related Term (Associative): Automatic fare collection (Dcmcf)
            Command guidance (Dcmg)
                 Use For: Command control
            Control in manufacturing (Dcmm)
                Automated guided vehicle systems (Dcmmb)
                     Use For: AGVS
                     Related Term (Associative): Robotics (Ttkns)
                Computer aided manufacturing (Dcmmd)
                Industrial robots (Dcmmr)
            Traffic control (Dcmt)
                 Related Term (Associative): Traffic (Bt)
                Air traffic control (Dcmtb)
                     Use For: Air traffic control systems; Air traffic management
                    Advanced automation system (Air traffic control) (Dcmtbc)
                    Air traffic control radar beacon system (Dcmtbf)
                         Use For: ATCRBS
                        Mode S (Dcmtbfm)
                             Use For: ADSEL; DABS; Discrete address beacon system
                    Aircraft separation (Dcmtbj)
                         Use For: Aircraft conflicts
                    Approach control (Dcmtbm)
                         Use For: Aircraft approach spacing
                    Automated radar terminal system (Dcmtbp)
                         Use For: ARTS (Automated radar terminal system)
                    Enroute traffic control (Dcmtbr)
                         Use For: Air route traffic control
                    Flight information services (Dcmtbt)
                    Flow control (Air traffic control) (Dcmtbu)
                         Use For: Flow management (Air traffic control)
                        Metering (Air traffic control) (Dcmtbum)
                    Free flight (Air traffic control) (Dcmtbv)
                    Radar air traffic control (Dcmtbw)
                         Use For: Radar landing control
                    Terminal air traffic control (Dcmtbx)
                        Airport surface traffic control (Dcmtbxc)
                             Use For: Ground control
                             Related Term (Associative): Runway incursions (Hbbar)
                Highway traffic control (Dcmth)
                     Use For: Street traffic control; Traffic management (Traffic control); Vehicular traffic control
                     Related Term (Associative): ; Highway operations (Bqd); Motor vehicle operations (Brd); Traffic engineering (Ttkfwt)
                    Highway traffic control systems (Dcmthc)
                        Advanced traffic management systems (Dcmthca)
                             Use For: Dynamic traffic management
                             Related Term (Associative): Traffic control centers (Pfder)
                            Integrated corridor management (Dcmthcaj)
                        Congestion management systems (Dcmthcc)
                        Lane closure (Dcmthcd)
                        Freeway management systems (Dcmthcf)
                             Use For: Freeway traffic control
                             Related Term (Associative): Automatic incident detection (Dmbytjb)
                            Mainline metering (Dcmthcfm)
                            Ramp metering (Dcmthcfr)
                                 Use For: Ramp control
                                 Related Term (Associative): Freeway operations (Bqdo); Traffic signals (Dcmthrrs); Merging control (Dcmvgp)
                        Grade crossing protection systems (Dcmthcg)
                             Use For: Active grade crossing warning systems; Grade crossing signals
                        Incident management (Dcmthcj)
                             Related Term (Associative): Freeway operations (Bqdo); Traffic incidents (Bthb); Automatic incident detection (Dmbytjb); Traffic crashes (Hbbgt); Emergency management (Hhgem)
                        Positive guidance (Dcmthcp)
                             Related Term (Associative): Driver information systems (Dsfpd); Human factors (Mxa)
                        Signalization (Dcmthcs)
                             Use For: Signal control; Signalisation
                            Traffic signal control systems (Dcmthcse)
                                 Use For: Automatic traffic signal control; Computer controlled signals; Interconnection (Traffic signals); Linked signals; Synchronization (Traffic signals); Traffic signal coordination; Traffic signal networks
                                Area traffic signal control (Dcmthcseb)
                                Progressive traffic signal control (Dcmthcsep)
                                     Use For: Corridor control
                            Traffic signal cycle (Dcmthcsk)
                                 Use For: Cycle (Traffic signals)
                                Traffic signal intervals (Dcmthcskj)
                                    Change interval (Traffic signal cycle) (Dcmthcskjb)
                                    Clearance interval (Traffic signal cycle) (Dcmthcskjc)
                                        Pedestrian clearance interval (Traffic signals) (Dcmthcskjcp)
                                    Green interval (Traffic signal cycle) (Dcmthcskjg)
                                        Bandwidth (Traffic signals) (Dcmthcskjgb)
                                    Red interval (Traffic signal cycle) (Dcmthcskjr)
                                         Related Term (Associative): Red light running (Huvmr)
                                    Yellow interval (Traffic signal cycle) (Dcmthcskjy)
                                         Use For: Amber phase
                                         Related Term (Associative): Dilemma zone (Pmrcpjfrd)
                                Traffic signal phases (Dcmthcskp)
                                    Phasing by right of way (Dcmthcskpr)
                                        Exclusive phasing (Dcmthcskpre)
                                             Use For: Protected phasing
                                        Permissive phasing (Dcmthcskprp)
                                        Exclusive permissive phasing (Dcmthcskprs)
                                             Use For: Protected permissive phasing
                                    Phases by type of traffic (Dcmthcskpt)
                                        Left turn phase (Dcmthcskptm)
                                            Lead-lag phasing (Dcmthcskptml)
                                        Pedestrian phase (Dcmthcskptp)
                                        Vehicular phase (Dcmthcskptv)
                            Traffic signal indications (Dcmthcsm)
                                 Related Term (Associative): Signal lights (Dsgpk)
                            Traffic signal preemption (Dcmthcsp)
                                 Use For: Preemption (Traffic signals)
                                 Related Term (Associative): Bus priority (Brubp)
                            Traffic signal priority (Dcmthcsr)
                                 Use For: Traffic signal priority systems; Transit signal priority
                            Traffic signal timing (Dcmthcsv)
                                 Use For: Settings (Traffic signals); Traffic signal settings
                                Offsets (Traffic signal timing) (Dcmthcsvp)
                        Speed control (Dcmthct)
                        Work zone traffic control (Dcmthcw)
                             Use For: Construction zone traffic control
                             Related Term (Associative): Drone radar (Dcnsbqd)
                            Tapers (Work zone traffic control) (Dcmthcwt)
                            Temporary barriers (Dcmthcwu)
                                 Use For: Movable barriers
                    Traffic control devices (Dcmthr)
                         Use For: Highway signs, signals and markings; Traffic signs and signals; Traffic signs, signals and markings
                         Related Term (Associative): 
                        Warning devices for persons with disabilities (Dcmthrb)
                            Audible warning devices (Dcmthrbb)
                                 Use For: Aural signals
                            Detectable warning surfaces (Dcmthrbd)
                                 Related Term (Associative): Visually impaired persons (Mmb)
                        Guideposts (Dcmthrc)
                            Mileposts (Dcmthrcm)
                                 Use For: Mileage markers; Milestones
                        Highway delineators (Dcmthre)
                             Use For: Roadside delineators
                        Traffic cones (Dcmthrg)
                        Traffic signs (Dcmthrk)
                             Use For: Highway signs
                             Related Term (Associative): ; 
                            Traffic signs by purpose (Dcmthrkb)
                                Guide signs (Dcmthrkbg)
                                    Direction signs (Dcmthrkbgd)
                                         Use For: Directional signs
                                    Route signs (Dcmthrkbgr)
                                Regulatory signs (Dcmthrkbr)
                                     Related Term (Associative): Traffic regulations (Crftr)
                                    Speed signs (Dcmthrkbrq)
                                    Stop signs (Dcmthrkbrs)
                                        Multiway stop signs (Dcmthrkbrsm)
                                             Use For: All way stop control
                                    Yield signs (Dcmthrkbry)
                                Warning signs (Dcmthrkbw)
                            Traffic signs by characteristics (Dcmthrkk)
                                Illuminated traffic signs (Dcmthrkkj)
                                Overhead traffic signs (Dcmthrkkn)
                                Reflective signs (Dcmthrkkr)
                                Symbol signs (Dcmthrkks)
                                Variable message signs (Dcmthrkkv)
                                     Use For: Changeable message signs; Dynamic message signs
                                     Related Term (Associative): ; Information display systems (Dsbg); Route guidance (Dsfpdr)
                            Traffic signs by audience (Dcmthrks)
                                Pedestrian signs (Dcmthrksp)
                        Traffic signal hardware (Dcmthrr)
                             Use For: Electronic traffic devices
                            Traffic signal controllers (Dcmthrrc)
                                 Use For: Controllers (Traffic signal control equipment); Electronic traffic controls
                                 Related Term (Associative): Electronic controllers (Qtbei)
                                Actuated traffic signal controllers (Dcmthrrcb)
                                    Pedestrian actuated controllers (Dcmthrrcbp)
                                         Use For: Pedestrian control signals
                                    Traffic actuated controllers (Dcmthrrcbt)
                                         Use For: Traffic actuated signals; Traffic responsive signals; Vehicle actuated signals
                                        Full traffic actuated controllers (Dcmthrrcbtf)
                                             Use For: Full actuation operation
                                        Semi traffic actuated controllers (Dcmthrrcbts)
                                             Use For: Semiactuated traffic signal controllers
                                Pretimed traffic signal controllers (Dcmthrrcp)
                                     Use For: Fixed time controllers; Fixed time traffic signals; Pretimed control
                            Traffic signals (Dcmthrrs)
                                 Use For: Highway traffic signals; Traffic control signals; Traffic lights
                                 Related Term (Associative): ; Ramp metering (Dcmthcfr)
                                Parts of traffic signals (Dcmthrrsb)
                                    Signal head (Dcmthrrsbh)
                                        Signal face (Dcmthrrsbhf)
                                             Use For: Signal lamps
                                Types of traffic signals (Dcmthrrsk)
                                    Audible pedestrian signals (Dcmthrrskb)
                                    Flashing traffic signals (Dcmthrrskf)
                                         Related Term (Associative): Highway beacons (Dcnsyhh)
                                    Lane use control signals (Dcmthrrskm)
                        Road markings (Dcmthru)
                             Use For: Carriageway markings; Pavement markings; Traffic markings
                             Related Term (Associative): 
                            Center lines (Dcmthruc)
                                 Use For: Centerlines
                            Edge lines (Dcmthrue)
                                 Use For: Edge markings
                            Lane lines (Dcmthrum)
                                 Use For: Lane markings
                            Raised road markings (Dcmthrur)
                                 Use For: Road studs
                                Reflectorized road markings (Dcmthrurr)
                                     Use For: Reflecting road studs
                            Rumble strips (Dcmthruu)
                        Speed control humps (Dcmthrx)
                             Use For: Road humps (Artificial); Speed bumps
                    Warrants (Traffic control devices) (Dcmthw)
                Railroad traffic control (Dcmtr)
                    Grade crossing protection systems (Dcmtrg)
                    Railroad signaling (Dcmtrs)
                        Block signal systems (Dcmtrsb)
                            Automatic block signal systems (Dcmtrsbb)
                        Centralized traffic control (Dcmtrsc)
                    Railroad traffic control devices (Dcmtry)
                        Railroad signals (Dcmtrys)
                            Cab signals (Dcmtrysc)
                            Wayside signals (Dcmtrysw)
                        Track circuits (Dcmtryt)
                Vessel traffic control (Dcmtv)
                     Use For: Vessel traffic services
                    Harbor traffic control (Dcmtvh)
            Automated vehicle control (Dcmv)
                 Use For: Automated transportation systems; Automatic navigation systems; Automatic transportation systems; Vehicle control; Vehicle guidance
                 Related Term (Associative): ; Vehicle electronics (Qpv)
                Guidance systems (Aircraft) (Dcmvb)
                    Flight control systems (Dcmvbf)
                         Use For: Flight control
                    Automatic landing systems (Dcmvbm)
                    Automatic pilot (Dcmvbp)
                    Unmanned aircraft systems (Dcmvbu)
                         Related Term (Associative): Drones (Qbkd)
                Automated vehicle control for ground vehicles (Dcmvg)
                    Active safety systems (Dcmvgb)
                    Longitudinal control (Dcmvgm)
                         Use For: Longitudinal guidance
                        Automatic braking (Dcmvgmb)
                             Related Term (Associative): Automatic train control (Dcmvgyf); Crash avoidance systems (Dcnsbc); Brakes (Qpk)
                        Automatic headway control (Dcmvgmh)
                             Use For: Vehicle follower control
                             Related Term (Associative): Car following (Bthkc)
                            Asynchronous control (Dcmvgmhb)
                            Quasi synchronous control (Dcmvgmhq)
                            Synchronous control (Dcmvgmhs)
                                 Use For: Moving slot control; Point follower control
                        Automatic speed control (Dcmvgms)
                            Intelligent speed adaptation (Dcmvgmsi)
                                 Use For: ISA
                                 Related Term (Associative): 
                    Merging control (Dcmvgp)
                         Use For: Merge control systems
                         Related Term (Associative): Ramp metering (Dcmthcfr); Merging area (Pmrcpjsrm)
                    Traction control (Dcmvgt)
                         Related Term (Associative): Suspension systems (Qpi)
                        Active suspension systems (Dcmvgtb)
                        Antilock brake systems (Dcmvgtf)
                             Use For: ABS
                    Control of specific ground vehicles (Dcmvgy)
                        Advanced vehicle control systems (Dcmvgyc)
                             Use For: Automated highway guidance; Drive by wire; Electronic vehicle guidance
                             Related Term (Associative): Automated highways (Pmrccpb); Guided buses (Qbddhpbkq); Autonomous land vehicles (Qbddkmb)
                            Automated highway systems (Dcmvgycb)
                                 Use For: Automatic highway systems
                            Driver support systems (Dcmvgycd)
                                 Use For: Advanced Driver Assistance Systems; Driver assistance systems (In vehicle); Electronic co-pilots
                                 Related Term (Associative): ; Automobile driving (Dcnbstyb); Driver vehicle interfaces (Esdhmd)
                            Automatic steering control (Dcmvgych)
                                 Use For: Lateral control; Lateral guidance; Steer by wire
                                 Related Term (Associative): Steering systems (Qpj)
                            Autonomous intelligent cruise control (Dcmvgycj)
                                 Use For: Adaptive cruise control; AICC; Intelligent cruise control
                                 Related Term (Associative): Cruise control (Qpnyff)
                        Automatic train control (Dcmvgyf)
                             Use For: Train control; Unattended train operation (UTO)
                             Related Term (Associative): Automatic braking (Dcmvgmb)
                            Automatic train operation (Dcmvgyfd)
                                 Use For: Driverless train operation
                                Jerk control (Dcmvgyfdj)
                            Automatic train protection (Dcmvgyfm)
                                 Use For: Train safety control systems
                            Automatic train stop system (Dcmvgyfr)
                            Automatic train supervision (Dcmvgyfu)
                            Block control systems (Dcmvgyfx)
                                Fixed block control (Dcmvgyfxf)
                                Moving block control (Dcmvgyfxm)
                            Positive train control (Dcmvgyfy)
                                 Use For: Advanced train control systems
                        Automated guideway transit (Dcmvgyg)
                             Use For: AGT
                            Personal rapid transit (Dcmvgygp)
                                 Use For: PRT
                        Autonomous vehicle guidance (Dcmvgyh)
                Driving automation levels (Dcmvl)
                    Level 0 driving automation (Dcmvla)
                         Use For: No driving automation
                    Level 1 driving automation (Dcmvlb)
                    Level 2 driving automation (Dcmvlc)
                         Use For: Partial driving automation
                    Level 3 driving automation (Dcmvld)
                         Use For: Conditional driving automation
                    Level 4 driving automation (Dcmvle)
                         Use For: High driving automation
                    Level 5 driving automation (Dcmvlf)
                         Use For: Full driving automation
                Trajectory control (Dcmvr)
                     Use For: Path planning (Robotics)
                     Related Term (Associative): Mobile robots (Dcjrm); Robotics (Ttkns)
                Automatic vessel control (Dcmvs)
                     Use For: Guidance systems (Ships)
                    Automatic pilot (Dcmvsb)
                         Use For: Autopilot
                    Dynamic positioning (Dcmvsm)
                    Voyage management systems (Dcmvsv)
                         Use For: Automatic ship systems; Computerized ship control
        Navigation (Dcn)
            Navigation processes (Dcnb)
                Dead reckoning (Dcnbd)
                Homing (Dcnbk)
                Position fixing (Dcnbp)
                Pilotage and driving (Dcnbs)
                     Related Term (Associative): Vehicle operations (Br); Train operation (Dct)
                    Pilotage (Dcnbsc)
                         Use For: Course control; Piloting
                        Aircraft pilotage (Dcnbscb)
                             Use For: Air navigation; Aircraft control; Aircraft guidance; Flying; Navigation (Aeronautics)
                             Related Term (Associative): Air pilots (Mtbb); Flight simulators (Qtpstsf)
                            Flight training (Dcnbscbb)
                                 Related Term (Associative): Training (Cet)
                            Instrument flying (Dcnbscbg)
                                 Use For: IFR
                            Visual flight (Dcnbscbh)
                                 Use For: VFR
                            Landing (Dcnbscbk)
                                Crash landing (Dcnbscbkb)
                                Ditching (Dcnbscbkd)
                            Takeoff (Dcnbscbt)
                                 Use For: Take-off
                            Taxiing (Dcnbscbu)
                            Turning (Aircraft pilotage) (Dcnbscbv)
                        Ship pilotage (Dcnbscs)
                             Use For: Inland navigation; Ship control; Ship handling
                             Related Term (Associative): Ship pilots (Mtjg)
                            Docking (Dcnbscsd)
                                 Use For: Berthing procedures
                            Ice navigation (Dcnbscsj)
                            Maneuvering (Dcnbscsn)
                                 Use For: Manoeuvring; Ship maneuvering
                                Conning (Dcnbscsnc)
                            Mooring (Dcnbscss)
                                Anchoring (Dcnbscssb)
                                     Use For: Embedment (Anchoring)
                    Driving (Dcnbst)
                         Use For: Motor vehicle handling; Vehicle handling; Vehicle navigation
                         Related Term (Associative): ; ; Motor vehicle operations (Brd)
                        Backing (Driving) (Dcnbsta)
                             Use For: Backing up (Driving); Reversing (Driving)
                        Braking (Dcnbstb)
                            Dynamic braking (Dcnbstbd)
                        Ecodriving (Dcnbstc)
                             Use For: Eco-driving
                             Related Term (Associative): 
                        Gear shifting (Dcnbstg)
                        Lane changing (Dcnbstm)
                        Passing (Dcnbstp)
                             Use For: Overtaking
                        Starting (Driving) (Dcnbstr)
                            Cold starts (Driving) (Dcnbstrc)
                                 Use For: Cold starting
                                 Related Term (Associative): 
                            Hot starts (Driving) (Dcnbstrh)
                        Steering (Dcnbsts)
                             Use For: Cornering; Curve negotiation
                             Related Term (Associative): Driver errors (Hbche)
                        Driving specific motor vehicles (Dcnbsty)
                            Automobile driving (Dcnbstyb)
                                 Related Term (Associative): Driver support systems (Dcmvgycd); Automobile navigation systems (Dcnsyhb); Driving simulators (Qtpstsd)
                            Bus driving (Dcnbstyd)
                            Motorcycle driving (Dcnbstym)
                            Truck driving (Dcnbstyt)
                        Driving cessation (Dcnbstz)
                             Related Term (Associative): ; Aged drivers (Mtghdfcu)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
                Navigation systems (Dcnsb)
                    Celestial navigation (Dcnsbb)
                         Use For: Astronavigation; Nautical astronomy
                    Crash avoidance systems (Dcnsbc)
                         Use For: Collision avoidance systems; TCAS; Traffic alert and collision avoidance system
                         Related Term (Associative): ; ; Automatic braking (Dcmvgmb)
                    Doppler navigation (Dcnsbd)
                         Use For: Doppler systems
                    Electronic navigation (Dcnsbe)
                    Hyperbolic navigation (Dcnsbh)
                    Inertial navigation systems (Dcnsbj)
                         Use For: Inertial guidance
                    Radar (Dcnsbq)
                         Related Term (Associative): Radar detectors (Dmgdrr)
                        Continuous wave radar (Dcnsbqb)
                             Use For: CW radar
                        Doppler radar (Dcnsbqc)
                        Drone radar (Dcnsbqd)
                             Related Term (Associative): ; Work zone traffic control (Dcmthcw)
                        Ground penetrating radar (Dcnsbqf)
                        Laser radar (Dcnsbqj)
                             Use For: Ladar; Lidar; Light Detection and Radar; Light Detection and Ranging
                             Related Term (Associative): 
                            Optical radar (Dcnsbqjp)
                                 Use For: OPDAR
                        Search radar (Dcnsbqm)
                            Navigation radar (Dcnsbqmn)
                        Side looking radar (Dcnsbqp)
                        Terrain avoidance radar (Dcnsbqs)
                        Weather radar (Dcnsbqv)
                             Use For: Meteorological radar
                    Radio navigation (Dcnsbs)
                        Loran (Dcnsbsm)
                            Loran C (Dcnsbsmc)
                        Omega navigation system (Dcnsbsp)
                        Very high frequency omnidirectional radio range (Dcnsbsv)
                             Use For: VOR
                    Satellite navigation systems (Dcnsbt)
                         Related Term (Associative): Navigational satellites (Dcnspm)
                        Global Positioning System (Dcnsbtg)
                             Use For: GPS
                             Related Term (Associative): 
                        Maritime mobile satellite system (Dcnsbtm)
                             Use For: Marisat
                        NAVSTAR (Dcnsbtn)
                             Use For: Navigation system using time and ranging
                    Sonic navigation (Dcnsbu)
                         Use For: Acoustic navigation; Sonar navigation
                    Tracking systems (Dcnsby)
                        Automatic tracking (Dcnsbyb)
                        Radar tracking (Dcnsbyr)
                Navigation charts (Dcnsj)
                     Related Term (Associative): Charts (Xxvmc)
                    Aeronautical charts (Dcnsjb)
                    Nautical charts (Dcnsjn)
                Navigation devices (Dcnsp)
                     Related Term (Associative): Instrument panels (Qpeyj)
                    Beacons (Dcnspb)
                        Highway beacons (Dcnspbg)
                            Flashing beacons (Dcnspbgf)
                        Obstruction beacons (Dcnspbj)
                        Radar beacons (Dcnspbp)
                             Use For: Racon; Radar transponders
                        Radio beacons (Dcnspbs)
                            Warning radio beacons (Dcnspbsw)
                    Compasses (Dcnspc)
                        Gyrocompasses (Dcnspcg)
                    Gyroscopes (Dcnspd)
                    Instrument displays (Dcnspe)
                         Related Term (Associative): Radar displays (Dcnspsd); Information display systems (Dsbg)
                        Head up displays (Dcnspeh)
                        Three dimensional displays (Dcnspet)
                    Flight recorders (Dcnspf)
                         Use For: Black boxes (Flight recorders); Flight data recorders
                         Related Term (Associative): Event data recorders (Qpye)
                    Navigation computers (Dcnspg)
                         Use For: Guidance computers; Navigational computers
                        Position indicators (Dcnspgp)
                    Navigation lights (Dcnspj)
                        Pyrotechnics (Dcnspjp)
                    Navigational satellites (Dcnspm)
                         Use For: Maritime satellites
                         Related Term (Associative): Satellite navigation systems (Dcnsbt)
                    Obstruction markers (Dcnspq)
                        Obstruction buoys (Dcnspqb)
                        Obstruction lights (Dcnspqm)
                    Radar devices (Dcnsps)
                        Radar beacons (Dcnspsb)
                             Use For: Racon; Radar transponders
                        Radar displays (Dcnspsd)
                             Related Term (Associative): Instrument displays (Dcnspe)
                            Radar images (Dcnspsdj)
                                Radar clutter (Dcnspsdjc)
                                     Use For: Clutter
                                Plan position indicators (Dcnspsdjm)
                                Radar targets (Dcnspsdjt)
                            Radar maps (Dcnspsdm)
                        Moving target indicators (Dcnspsm)
                             Use For: Moving target detectors
                        Radar receivers (Dcnspsr)
                             Use For: Navigation receivers
                    Radio navigation devices (Dcnspt)
                         Related Term (Associative): Radio equipment (Dsgm)
                        Radio beacons (Dcnsptb)
                            Warning radio beacons (Dcnsptbw)
                        Radio direction finders (Dcnsptd)
                             Use For: Direction finders
                        Emergency locator transmitters (Dcnsptf)
                             Use For: ELT
                        Transponders (Dcnsptt)
                Navigational aids by reference to craft (Dcnsx)
                    Aids to navigation (Dcnsxb)
                        Aids to air navigation (Dcnsxbb)
                            Terminal navigation aids (Dcnsxbbt)
                    Onboard navigational aids (Dcnsxp)
                        Airborne navigational aids (Dcnsxpb)
                             Use For: Avionic navigation aids
                Navigational aids specific to a craft or vehicle (Dcnsy)
                    Aircraft navigational aids (Dcnsyb)
                         Use For: Aeronautical instruments
                        Distance measuring equipment (Dcnsybd)
                             Use For: DME
                        Landing aids (Dcnsybm)
                            All weather landing systems (Dcnsybmc)
                            Glide path systems (Dcnsybmg)
                                 Use For: Glide paths; Glide slope
                            Instrument landing systems (Dcnsybmj)
                                 Use For: Instrument approach system; Instrument landings
                            Microwave landing systems (Dcnsybmm)
                        Stabilized platforms (Dcnsybp)
                        Tactical air navigation system (Dcnsybq)
                             Use For: Tacan
                    Motor vehicle navigational aids (Dcnsyh)
                         Use For: Electronic driving aids
                         Related Term (Associative): Driver information systems (Dsfpd); Vehicle electronics (Qpv)
                        Automobile navigation systems (Dcnsyhb)
                             Use For: Onboard navigation systems (Automobiles)
                             Related Term (Associative): Automobile driving (Dcnbstyb); Route guidance (Dsfpdr)
                        Highway beacons (Dcnsyhh)
                             Related Term (Associative): Flashing traffic signals (Dcmthrrskf)
                        Passing aid systems (Dcnsyhp)
                        Roadway guidance markers (Dcnsyhr)
                             Use For: Guidance references (Highways); Magnetic markers (Highways)
                             Related Term (Associative): Permanent magnets (Dcjp)
                    Ship navigational aids (Dcnsys)
                        Buoys (Dcnsysd)
                            Obstruction buoys (Dcnsysdp)
                        Lightships (Dcnsysm)
                        Sonar (Dcnsyss)
                            Doppler sonar (Dcnsyssd)
                            Sonar domes (Dcnsysst)
                            Sonar transducers (Dcnsyssv)
                        Voyage data recorders (Dcnsysv)
                             Related Term (Associative): Event data recorders (Qpye)
                Distress alerting systems (Dcnsz)
            Obstructions (Navigation) (Dcnu)
                 Use For: Obstacles (Navigation)
                Clearances (Navigation) (Dcnuc)
        Train operation (Dct)
             Use For: Train handling
             Related Term (Associative): Pilotage and driving (Dcnbs); Train crews (Mtgr)
            Locomotive operation (Dctm)
            Retarder control (Dctr)
    Detection and identification (Dm)
        Detection and identification systems (Dmb)
            Identification systems (Dmbj)
                 Related Term (Associative): Detectors (Dmgd)
                Character recognition (Dmbjc)
                    Optical character recognition (Dmbjcp)
                         Use For: OCR
                Machine vision (Dmbjj)
                    Computer vision (Dmbjjc)
                        Robot vision (Dmbjjcr)
                    Image analysis (Dmbjjh)
                         Use For: Image interpretation
                    Image processing (Dmbjjk)
                    Pattern recognition systems (Dmbjjp)
                        Edge detection (Dmbjjpe)
                    Visual texture recognition (Dmbjjt)
                         Use For: Texture analysis (Computer vision)
                Radio frequency identification (Dmbjs)
                     Use For: RFID
            Monitoring (Dmbm)
                 Use For: Monitoring systems
                 Related Term (Associative): Measurement (Gm); Radiation monitoring (Hhrm); Environmental monitoring (Jff)
            Remote sensing (Dmbr)
                 Use For: Remote detectors; Remote sensors
            Surveillance (Dmbt)
            Detection and identification system applications (Dmby)
                Automatic car identification (Dmbyb)
                     Use For: ACI
                Automatic train location (Dmbyc)
                     Use For: Train detectors
                     Related Term (Associative): Car location (Railroads) (Brrce)
                Automatic equipment identification (Dmbye)
                     Use For: AEI
                Driver monitoring (Dmbyp)
                Fault monitoring (Dmbyr)
                     Related Term (Associative): Reliability (Qvr)
                Traffic surveillance (Dmbyt)
                     Use For: Traffic monitoring
                     Related Term (Associative): ; ; Closed circuit television (Dsbpvc)
                    Incident detection (Dmbytj)
                         Related Term (Associative): Freeway operations (Bqdo)
                        Automatic incident detection (Dmbytjb)
                             Use For: AID (Automatic incident detection)
                             Related Term (Associative): Traffic incidents (Bthb); Freeway management systems (Dcmthcf); Incident management (Dcmthcj)
                Automatic vehicle detection and identification systems (Dmbyv)
                    Automatic vehicle classification (Dmbyvc)
                    Automatic vehicle identification (Dmbyvj)
                         Use For: AVI
                         Related Term (Associative): Automated toll collection (Dcmcb)
                    Automatic vehicle location (Dmbyvm)
                         Use For: Automatic location systems; AVL; Vehicle locating systems
                         Related Term (Associative): ; Telematics (Dt)
                    Automatic vehicle monitoring (Dmbyvp)
                         Use For: AVM; Vehicle monitoring
                    Weigh in motion (Dmbyvw)
                         Use For: WIM
                         Related Term (Associative): Vehicle detectors (Dmgdrv); Commercial vehicle operations (Dtvbu); Trucks (Qbddf)
                    Automated clearance (Dmbyvy)
                         Use For: Credentialing (Trucking); Electronic clearance; Mainline automated clearance systems
        Detection and identification technologies (Dmg)
            Detectors (Dmgd)
                 Related Term (Associative): Identification systems (Dmbj)
                Types of detectors (Dmgde)
                    Acoustic detectors (Dmgdeb)
                        Geophones (Dmgdebg)
                             Use For: Velocity transducers
                             Related Term (Associative): Accelerometers (Gumpa)
                        Hydrophones (Dmgdebh)
                        Ultrasonic detectors (Dmgdebu)
                    Infrared detectors (Dmgdee)
                         Use For: Infrared scanning
                    Loop detectors (Dmgdeh)
                         Use For: Induction loop detectors; Induction loops; Inductive loops
                         Related Term (Associative): 
                    Magnetic detectors (Dmgdek)
                    Magnetometer detectors (Dmgdem)
                    Microwave detectors (Dmgdeq)
                    Optical detectors (Dmgdet)
                    Photodetectors (Dmgdeu)
                    Proximity detectors (Dmgdew)
                         Use For: Obstacle detection
                    Scintillation counters (Dmgdex)
                    Video imaging detectors (Dmgdey)
                         Use For: Wide area detector systems
                        Automatic license plate readers (Dmgdeyb)
                Detectors by object of detection (Dmgdr)
                    Explosives detectors (Dmgdre)
                         Use For: Bomb detectors
                         Related Term (Associative): Bombs (Qtpyb); Explosives (Rbmdse)
                    Gas detectors (Dmgdrg)
                    Hot box detectors (Dmgdri)
                         Related Term (Associative): Journal boxes (Qtbmydjb)
                    Pedestrian detectors (Dmgdrp)
                    Radar detectors (Dmgdrr)
                         Related Term (Associative): Radar (Dcnsbq)
                    Speed detectors (Dmgdrt)
                    Vehicle detectors (Dmgdrv)
                         Use For: Traffic actuated detectors; Traffic detectors; Vehicle detecting equipment; Vehicle detection
                         Related Term (Associative): ; Weigh in motion (Dmbyvw)
                        Radar vehicle detectors (Dmgdrvr)
            Landsat satellites (Dmgm)
            Rangefinders (Dmgr)
                Optical rangefinders (Dmgrp)
            Scanners (Dmgs)
                 Use For: Electronic scanners
                 Related Term (Associative): Information processing (Xbk)
                Optical scanners (Dmgsp)
                     Use For: Flying spot scanners; Visual scanners
                    Bar code scanners (Dmgspb)
                         Use For: Bar code readers
                    Image fields in optical scanning (Dmgspy)
                        Bar codes (Dmgspyb)
                            Universal product codes (Dmgspybt)
                        Electronic license plates (Dmgspye)
            Sensors (Dmgu)
                 Use For: Primary detectors
                In vehicle sensors (Dmgum)
                     Use For: Automotive sensors
                     Related Term (Associative): Vehicle electronics (Qpv)
                    Crash sensors (Dmgume)
                         Related Term (Associative): Air bags (Qpqrpb)
                    Tire pressure monitoring systems (Dmgumt)
                Temperature sensors (Dmgut)
            Video (Dmgv)
    Communication (Ds)
         Related Term (Associative): 
        Communication systems (Dsb)
             Use For: Communications networks
             Related Term (Associative): ; Information systems (Xbf)
            Data communications (Dsbb)
                 Use For: Data transmission systems
                 Related Term (Associative): Information processing (Xbk); Data sharing (Xsd)
                Electronic data interchange (Dsbbe)
                     Use For: EDI
                Electronic mail (Dsbbm)
                     Use For: Email
                Image transmission (Dsbbp)
                Self describing data (Dsbbs)
                Transborder data flow (Dsbbt)
            Social media (Dsbc)
                 Related Term (Associative): 
            Digital communication systems (Dsbd)
                Digital subscriber lines (Dsbdd)
                     Use For: DSL
                Multi access systems (Dsbdm)
                     Use For: Multiple access systems
                    Access control (Communications) (Dsbdmc)
                        Carrier sense multiple access (Dsbdmcc)
                        Code division multiple access (Dsbdmcg)
                        Demand assigned multiple access (Dsbdmcn)
                        Frequency division multiple access (Dsbdmcr)
                        Time division multiple access (Dsbdmcu)
                             Use For: TDMA
            Facsimile (Dsbe)
                 Use For: Fax transmission
            Information display systems (Dsbg)
                 Use For: Display systems
                 Related Term (Associative): Variable message signs (Dcmthrkkv); Instrument displays (Dcnspe); Video display terminals (Qtpxmpq)
                Data displays (Dsbgd)
                Digital displays (Dsbgg)
                    Digital video (Dsbgge)
                    Liquid crystal displays (Dsbggm)
                         Use For: LCDs
            Meteor burst communications (Dsbk)
            Microwave communication systems (Dsbm)
                Millimeter wave communication systems (Dsbmm)
            Mobile communication systems (Dsbn)
                 Use For: Connected vehicle technologies
                 Related Term (Associative): Connected vehicles (Dtvc); Computer network protocols (Xbkrf)
                Dedicated short range communications (Dsbnb)
                     Use For: DSRC
                Location based services (Dsbnl)
                Mobile radio (Dsbnm)
                    Mobile telephones (Dsbnmb)
                         Related Term (Associative): Text messaging (Dsmbt)
                    Cellular radio (Dsbnmc)
                        Cellular telephones (Dsbnmcb)
                             Use For: Cell phones
                             Related Term (Associative): Text messaging (Dsmbt)
                            Smartphones (Dsbnmcbs)
                Vehicle to infrastructure communications (Dsbnu)
                     Use For: Roadside to vehicle communications; Vehicle to roadside communications
                     Related Term (Associative): 
                Vehicle to vehicle communications (Dsbnw)
                     Use For: Inter-vehicle communications
                     Related Term (Associative): 
            Radio and television (Dsbp)
                Radio (Dsbpp)
                     Related Term (Associative): Automatic radio information (Dsfpdf); Highway advisory radio (Dsfpdh)
                    Citizen band radio (Dsbppd)
                    Mobile radio (Dsbppm)
                        Cellular radio (Dsbppmc)
                    Radio links (Dsbppr)
                    Radio relay systems (Dsbpps)
                    Radio telephone (Dsbppt)
                         Use For: Radiotelephone
                    Selective calling systems (Dsbppv)
                    Time signals (Dsbppx)
                Television (Dsbpv)
                    Closed circuit television (Dsbpvc)
                         Use For: CCTV
                         Related Term (Associative): Traffic surveillance (Dmbyt); Television cameras (Qtprct)
                    Teletext systems (Dsbpvv)
            Satellite communication (Dsbq)
            Signaling (Dsbr)
                 Use For: Signalling
                Hand signaling (Dsbrh)
            Telecommunications (Dsbs)
                 Use For: Information and communication technologies; Telecommunication systems
                Teleconferencing (Dsbsc)
                SONET (Dsbss)
                     Use For: Synchronous optical network
                Voice communication (Dsbsv)
                     Use For: Oral communication; Verbal communication
                     Related Term (Associative): Speech (Mxbw)
            Telephone (Dsbt)
                Audiotex (Dsbtb)
            Telex (Dsbu)
            Videotext (Dsbv)
            Wireless communication systems (Dsbw)
                 Use For: Device to device communications
                Bluetooth technology (Dsbwb)
                Personal communication networks (Dsbwp)
                     Related Term (Associative): Personal communication devices (Dsgl)
            Wideband communication systems (Dsbx)
                Spread spectrum communications (Dsbxs)
        Communication systems by recipient (Dsf)
            Mass communication (Dsfm)
            Traveler information and communication systems (Dsfp)
                 Use For: Passenger information
                 Related Term (Associative): ; Kiosks (Pfbk); Information systems (Xbf); Crowdsourcing (Xbkcc)
                Advanced traveler information systems (Dsfpb)
                     Related Term (Associative): Real time information (Xbfr)
                Motorist aid systems (Dsfpc)
                     Use For: Driver aid systems; Driver assistance systems (Motorist aid)
                    Automatic crash notification (Dsfpcb)
                         Use For: Automated accident detection; Automated collision notification
                         Related Term (Associative): Emergency communication systems (Hhgec); Event data recorders (Qpye)
                    Emergency road service (Dsfpce)
                    Freeway service patrols (Dsfpcg)
                Driver information systems (Dsfpd)
                     Use For: Driver communications; Highway communications; In vehicle advisory; In vehicle communications; Traffic information systems
                     Related Term (Associative): ; ; Positive guidance (Dcmthcp); Motor vehicle navigational aids (Dcnsyh); Telematics (Dt); Crowdsourcing (Xbkcc)
                    Advanced driver information systems (Dsfpdb)
                         Use For: Computer aided routing system; Dynamic route guidance
                    Automatic radio information (Dsfpdf)
                         Use For: ARI
                         Related Term (Associative): Radio (Dsbpp)
                    Highway advisory radio (Dsfpdh)
                         Use For: HAR
                         Related Term (Associative): Radio (Dsbpp)
                    Road weather information systems (Dsfpdp)
                         Use For: RWIS
                         Related Term (Associative): Weather (Jbmwb)
                    Route guidance (Dsfpdr)
                         Use For: In vehicle route guidance
                         Related Term (Associative): Variable message signs (Dcmthrkkv); Automobile navigation systems (Dcnsyhb)
                        Parking guidance systems (Dsfpdrp)
                             Related Term (Associative): Parking (Brdd)
                Passenger information systems (Dsfpp)
        Communication devices (Dsg)
             Use For: Communication equipment
             Related Term (Associative): Equipment (Qt)
            Communications satellites (Dsgc)
            Optical waveguides (Dsgk)
                 Use For: Optical fiber cables
            Personal communication devices (Dsgl)
                 Related Term (Associative): Personal communication networks (Dsbwp)
            Radio equipment (Dsgm)
                 Use For: Radios
                 Related Term (Associative): Radio navigation devices (Dcnspt)
                Antennas (Dsgmb)
                    Dipole antennas (Dsgmbd)
                    Directional antennas (Dsgmbg)
                    Omnidirectional antennas (Dsgmbn)
                    Radar antennas (Dsgmbs)
                        Phased arrays (Dsgmbsp)
                             Use For: Antenna arrays
                Antenna accessories (Dsgmc)
                    Radomes (Dsgmcr)
                Emergency radio equipment (Dsgme)
                    Call boxes (Driver aid devices) (Dsgmec)
                         Use For: Emergency call systems
                Multiplexers (Dsgmm)
                     Use For: Multiplexors
                Radio receivers (Dsgmr)
                Radio transmitters (Dsgmt)
                     Use For: Transmitters
                Terminal equipment (Radio) (Dsgmv)
                Transceivers (Dsgmw)
                     Use For: Transmitter receivers
                Transponders (Dsgmx)
            Signal devices (Dsgp)
                 Use For: Signal equipment
                Signal lights (Dsgpk)
                     Related Term (Associative): Traffic signal indications (Dcmthcsm)
            Signs (Dsgr)
                 Use For: Signing
                Lettering (Dsgrm)
                Sign sheeting (Dsgrp)
                Symbols (Dsgrs)
            Suppressors (Dsgs)
            Telephone equipment (Dsgv)
                Modems (Dsgvm)
                     Use For: Datasets (Equipment)
            Terminals (Communications) (Dsgw)
            Transducers (Dsgx)
                 Related Term (Associative): 
                Electroacoustic transducers (Dsgxe)
                Piezoelectric transducers (Dsgxp)
                Vibrating wire transducers (Dsgxz)
        Transmission (Dsm)
             Related Term (Associative): Radio frequency (Sfrwbfr)
            Messages (Communications) (Dsmb)
                Communications traffic (Dsmbc)
                Entropy (Communications) (Dsmbe)
                Recording (Dsmbr)
                Signals (Dsmbs)
                    Arrows (Signals) (Dsmbsb)
                    Distress signals (Dsmbsd)
                    Radio signals (Dsmbsr)
                    Strobes (Dsmbst)
                    Warning signals (Dsmbsw)
                         Related Term (Associative): 
                Text messaging (Dsmbt)
                     Use For: Short message service; SMS (Short message service); Texting
                     Related Term (Associative): ; Mobile telephones (Dsbnmb); Cellular telephones (Dsbnmcb)
            Transmission techniques (Dsmm)
                Broadcasting (Dsmmb)
                    Digital audio (Dsmmbb)
                         Use For: Digital radio
                    Digital television (Dsmmbt)
                Fiber optics (Dsmmd)
                     Use For: Fibre optics
                Frequency allocation (Dsmmf)
                Line of sight (Dsmmh)
                Modulation (Communications) (Dsmmj)
                    Amplitude modulation (Dsmmjb)
                    Frequency modulation (Dsmmjf)
                    Pulse modulation (Dsmmjp)
                        Pulse code modulation (Dsmmjpc)
                        Pulse duration modulation (Dsmmjpd)
                             Use For: Pulse width modulation
                Multiplexing (Dsmmm)
                    Time division multiplexing (Dsmmmt)
                        Packet switching (Dsmmmtp)
                             Use For: Packet transmission
                Segmentation (Communications) (Dsmmp)
                Signal processing (Dsmmr)
                    Acoustic signal processing (Dsmmrb)
                Data streaming (Dsmms)
                     Related Term (Associative): Cloud computing (Xbkrja)
                Speech recognition (Dsmmt)
                     Use For: Speech processing systems; Voice recognition
                    Speech synthesis (Dsmmts)
                Telemetry (Dsmmv)
                     Use For: Radio telemetry
            Transmission errors and interference (Dsmr)
                Crosstalk (Dsmrc)
                Interference (Dsmrj)
                     Use For: Electrical interference
                    Atmospheric interference (Dsmrjc)
                         Use For: Atmospherics
                    Electromagnetic interference (Dsmrje)
                    Inductive interference (Dsmrjj)
                    Radio frequency interference (Dsmrjr)
                    Telephone influence factors (Dsmrjt)
                Multipath transmission (Dsmrk)
                Noise (Communications) (Dsmrn)
                    Signal to noise ratio (Dsmrns)
                Splitting (Communications) (Dsmrs)
                Transmission loss (Dsmrt)
    Telematics (Dt)
         Use For: Automotive telematics
         Related Term (Associative): Automatic vehicle location (Dmbyvm); Driver information systems (Dsfpd); Vehicle electronics (Qpv)
        Intelligent transportation systems (Dtv)
             Use For: Advanced transport telematics; ATT; Intelligent vehicle highway systems; ITS (Intelligent transportation systems); IVHS; Road transport informatics; RTI
            Vehicular ad hoc networks (Dtva)
                 Use For: VANETs
            ITS program applications (Dtvb)
                Advanced public transportation systems (Dtvbc)
                     Use For: APTS
                Advanced rural transportation systems (Dtvbf)
                     Use For: ARTS (Advanced rural transportation systems)
                Commercial vehicle operations (Dtvbu)
                     Use For: CVO
                     Related Term (Associative): Trucking (Aeght); Weigh in motion (Dmbyvw)
            Connected vehicles (Dtvc)
                 Related Term (Associative): Mobile communication systems (Dsbn); Intelligent vehicles (Qbddkj)
            ITS program technologies (Dtvm)
                Advanced traffic management systems (Dtvmj)
                     Use For: ATMS
                Advanced traveler information systems (Dtvmn)
                     Use For: ATIS
                    Advanced driver information systems (Dtvmnd)
                         Use For: ADIS
                Advanced vehicle control systems (Dtvmr)
                     Use For: AVCS
            Intelligent transportation systems programs (Dtvx)
                 Related Term (Associative): Research (Xkb)

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