What color must tail lamps be?

Tail lamps must be red because red is universally recognized as the standard color for signaling a vehicle's presence and indicating that it is stopping or braking. This convention helps ensure safety on the road by providing a clear, consistent signal to drivers behind the vehicle. The use of red tail lamps complies with traffic regulations, which specify that these lights must emit red light when the vehicle's taillights are illuminated. This consistency in color helps reduce confusion and enhances the visibility of vehicles, especially in low-light conditions.

Other colors, such as yellow or green, are designated for different functions, such as turn signals or hazard lights, while white is typically used for front lights or reverse lights. By adhering to the standard of red for tail lamps, drivers can better communicate their actions to others on the road, contributing to overall traffic safety.