What do the yellow rectangular plates with a red border on the rear of a truck mean?

Question

DentroTest · Accepted Answer

Plate V-6, “Long vehicle”, is placed on the rear of the vehicle (one centered plate or two symmetrical ones) and is yellow, reflective, with a fluorescent red border. It indicates that the vehicle or combined vehicle has a length of more than 12 meters (General Vehicle Regulations, Annex XI). Saying that it identifies a slow vehicle of less than 40 km/h is an error: a slow vehicle, which by construction cannot exceed 40 km/h, is identified with V-5, “Slow vehicle”. And saying that it indicates a vehicle registered and inspected in Spain is also an error: nationality is indicated with the V-7 sticker, “Spanish nationality sticker”, and the technical inspection with the roadworthiness test (ITV) sticker.

What do the yellow rectangular plates with a red border on the rear of a truck mean?

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