Abstract: A lighting control circuit having particular adaptability to tractor-trailer truck usage where a considerable increase of illumination is provided for the best interests of safety. The circuitry provides non-blinking left and right turn signal lights which supplement the blinking of the existing turn signal lights. Additionally, backup lights are programmed into the circuit operation. Through the use of a four-way flasher control, all the lights on the vehicle are caused to serve flashing, signaling an/or blinking purposes, except those provided by the invention which remain non-blinking.