What color must a motorcycle's tail lamp be?

The correct choice for the color of a motorcycle's tail lamp is red. In Texas, as well as in many other jurisdictions, the law specifies that the tail lamp must emit a red light. This requirement is in place for safety reasons, ensuring that the vehicle is visible to other road users, particularly in low-light conditions. The red light on the tail lamp signals to drivers behind the motorcycle that it is present and moving, which helps prevent accidents. Additionally, using red for tail lamps is a universal standard in vehicle lighting, further reinforcing recognition and compliance across different types of vehicles.

The other color options do not comply with the legal standards for tail lamps. White is typically reserved for headlights, amber is used for turn signals or markers, and green is not standard for any tail lamp of motor vehicles.