Which item is a type of traffic control preemption device?

• A. Strobe light activated preemption device
• B. Solar powered horn
• C. Daytime running lights
• D. Rearview camera

Answer: (A)

Traffic control preemption devices are systems that let an emergency vehicle override traffic signals to create a green path for its approach. A strobe light activated preemption device is designed to trigger the intersection controller when it detects a specific strobe flash from the emergency vehicle, changing the signal timing to clear the way. This direct link to the traffic signal makes it a true preemption device. The other options don’t interact with the traffic control system: a solar powered horn is just an audible alert, daytime running lights are for visibility, and a rearview camera assists with backing up.