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Traffic signal hardware (Dcmthrr)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Control system applications (Dcm)
            Traffic control (Dcmt)
                 Related Term (Associative): Traffic (Bt)
                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)
                    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)
                        Guideposts (Dcmthrc)
                        Highway delineators (Dcmthre)
                             Use For: Roadside delineators
                        Traffic cones (Dcmthrg)
                        Traffic signs (Dcmthrk)
                             Use For: Highway signs
                             Related Term (Associative): ; 
                        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)
                            Traffic signals (Dcmthrrs)
                                 Use For: Highway traffic signals; Traffic control signals; Traffic lights
                                 Related Term (Associative): ; Ramp metering (Dcmthcfr)
                        Road markings (Dcmthru)
                             Use For: Carriageway markings; Pavement markings; Traffic markings
                             Related Term (Associative): 
                        Speed control humps (Dcmthrx)
                             Use For: Road humps (Artificial); Speed bumps