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Roadway guidance markers (Dcnsyhr)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Navigation (Dcn)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
                Navigational aids specific to a craft or vehicle (Dcnsy)
                    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)