What is the required color for tail lamps on all passenger cars, trucks, and buses?

The required color for tail lamps on all passenger cars, trucks, and buses is red. This standard is established for safety reasons, allowing other drivers to easily identify the presence and position of vehicles on the roadway, especially at night or in low visibility conditions. Red is universally recognized as a signal that indicates the rear of a vehicle, and it communicates important information to other road users, such as when the vehicle is stopping or slowing down.

Using red for tail lamps helps to create a uniform understanding among drivers, thereby enhancing road safety. In contrast, white or blue tail lamps could be confusing and are not standard for passenger vehicles, as white is typically used for reverse lights and blue may signal emergency vehicles. Amber is commonly used for turn signals or hazard lights, but it does not replace the requirement for red tail lamps.