apparatus for synchronizing vehicle braking indicators to reduce braking reaction times of following vehicles includes a transmitter and signaler on each vehicle for producing rearwardly directed ir and visible radiation , respectively , in response to operation of vehicle brakes ; and a forwardly oriented receiver for detecting a counterpart of the ir radiation . the apparatus substantially eliminates typical following divers &# 39 ; reaction times of one to two seconds per car , giving extra braking room of 100 to 200 feet per car at 70 mph . the signaler can activate conventional brake lights of the vehicle and / or auxiliary brake lights , preferably for a limited signaling duration . the receiver can be responsive to a vehicle speedometer signal for operation only at or above a predetermined speed such as 10 mph .