Update your semi or trailer with bright and clear signal lights, with the Dorman 6-LED Turn Signal Marker Light that ensures you're Ready for the Road Ahead. To make certain vehicles adhere to local or federal standards, this replacement bulb emits a vivid beam to indicate brakes, tail signals, or emergencies. Constructed with a high-efficiency bulb to work for extended periods of time. FleetPride is your First Click in Heavy Duty.