Abstract: The intent of this present invention referred to as the A.S.D. light system is to prevent rear end collisions and therefore improve safety and reduce fatalities on highways and streets. These tail lights indicate whether the vehicle Is accelerating, stopping or decelerating. The A.S.D. light System places an additional light on each side of a vehicle's existing high center brake light. To the immediate left of the brake light is a green light that indicates acceleration. To the immediate right of the brake light is an amber light that indicates deceleration. Although this invention has been described with respect to Specific embodiments, it is not intended to be limited thereto In it's various modifications which will become apparent to the person of ordinary skill in the art and is intended to fall within the spirit and scope of the inventor as described herein taken in conjunction with the accompanying drawings and the appended claim herein.