Any mechanically propelled vehicle, registered in the UK, that requires insurance for use on the public highway as specified under the Road Traffic Act 1988 and does not exceed any of the following dimensions when fully loaded:
- Caravans and trailers - 8 metres in length (including A-frame)
- Motorhomes - 8 metres in length or 7.5 tonnes in weight
- All other vehicles - 7 metres in length, 2.3 metres in width, 3 metres in height or 3.5 tonnes in weight
All vehicles must also meet the criteria specified in Section B - Vehicles.