Prepare your semi to be Ready for the Road Ahead with bright flashing lights for emergency or warning situations, with the OTR 3-5/8" Permanent Mount Strobe Light. With an alternating pattern that provides enhanced visibility, this replacement light alerts other drivers, workers, or spectators of a delicate situation. Manufactured with a sturdy outdoor body to perform its best in all types of weather conditions. FleetPride is your First Click in Heavy Duty .