Variable message sign,Taxi roof LED display,Trailer VMS,Traffic LED sign - Yaham. Yaham-Variable Message Sign (VMS) can be placed in a wide range of places like highways, major road junctions, and urban arteries. Typically installed at the side or above the roadway, the VMS uses text and graphics in monochrome or color.. Variable Message Sign,LED traffic display,Variable Traffic Signs,Passenger Information Display,flight information display,VMS,Yaham,traffic display,Taxi roof LED display,Metro Display,Variable sign,traffic screen,Bus display,led moving signs,mobile VMS