What color must clearance lamps mounted on the rear or side near the rear of a vehicle be?

Answer: C — Red

Clearance lamps that are mounted on the rear or side near the rear of a vehicle must be red. This requirement aligns with regulations that specify the color coding for vehicle lighting to ensure proper visibility and communication to other drivers on the road. Red is universally recognized as a color indicating the rear of vehicles, helping to distinguish the presence and dimensions of the vehicle, especially in low light conditions. The choice of red for rear clearance lamps is critical for enhancing safety, as it alerts other drivers to the vehicle's presence and its position on the road, reducing the likelihood of collisions. Understanding these color coding rules is essential for CDL holders, ensuring they comply with safety regulations when operating large vehicles that may have different lighting requirements compared to standard passenger vehicles.