How many and what color must a trailer's tail lamps be?

A trailer must have two tail lamps that are red in color. This requirement is established to ensure visibility and safety on the road. Red lamps are universally recognized as signaling the rear of a vehicle, helping other drivers to identify the presence of the trailer, especially at night or in low visibility conditions.

Two tail lamps provide additional safety by offering redundancy; if one lamp fails, the second one remains operational, enhancing the visibility of the trailer. This is critical in preventing accidents and ensuring that other drivers maintain a safe distance when overtaking or following the trailer.

In contrast, having only one tail lamp, having either yellow tail lamps or an incorrect number fails to meet the safety standards set forth for trailers, as yellow is typically used for turn signals, not for tail lamps. This reinforces the importance of having two red tail lamps for proper identification and safety on the roads.