What color is the background of the license plate on heavy trailers?
Traffic safety: Plates
Explanation
Heavy trailers, which are those that can carry more than 750 kilograms, must have a specific **license plate**. This plate is placed at the rear of the trailer and is different from the standard license plates used by cars and motorcycles.
The license plate of heavy trailers has a **red background**. This is important to distinguish them from other types of vehicles and lighter trailers, which do not require an additional license plate. Furthermore, the red color helps make them more visible on the road, especially in low-light conditions.

Therefore, the background color of the license plate of heavy trailers is **red**.
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