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Types of roads by network (Pmrccn)

Facilities (P)
     Use For: Complexes; Installations
    Transportation, hydraulic and utility facilities (Pm)
        Highway facilities (Pmr)
             Related Term (Associative): Underground structures (Pdv); Bridges and culverts (Pdy)
            Roads (Pmrc)
                Types of roads (Pmrcc)
                    Principal types of roads (Pmrccd)
                    Types of roads by environment (Pmrcce)
                    Types of roads by jurisdiction (Pmrccj)
                    Types of roads by number of lanes (Pmrcck)
                    Types of roads by network (Pmrccn)
                        Access roads (Pmrccnb)
                             Related Term (Associative): 
                        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)
                    Unpaved roads (Pmrccu)
                    Types of roads by traffic volume (Pmrccv)