What does a rear V-6 plate with a reflective yellow background and fluorescent red border indicate on a vehicle or combination?

Correct answer

That it is more than 12 metres long

It indicates that the vehicle or combination is more than 12 metres long under Annex XI of the General Vehicle Regulations. The background is reflective yellow and the border fluorescent red. It is fitted at the rear under the sign’s requirements; by itself it does not identify dangerous-goods transport or solely special vehicles. The full description distinguishes the plate from an unspecified yellow rectangle.