control cab car / traffic control device / control equipment / transportation / vehicular travel / light rail transit equipment / bicycle travel / manually-operated traffic control device / traffic control devices / wireless technologies / light rail transit warning devices / similar audible warning device / electrical device / retroreflective device / hand-signaling devices / transportation modes / active warning devices / particular device / public travel / overhead receiving equipment / /
Organization
Transportation Commission / State transportation agency / National Electrical Manufacturers Association / Oklahoma Oklahoma Department of Transportation Traffic Engineering Division / Malfunction Management Unit / /