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Variable message signs (Dcmthrkkv)

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): 
                        Traffic signs (Dcmthrk)
                             Use For: Highway signs
                             Related Term (Associative): ; 
                            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)