There is a common misunderstanding that caravans and trailers should be attached to a vehicle whilst parked on the public highway� this is not the case. There is also no legal requirement for either to be attached to a vehicle.
There are specific offences relating to nuisance and obstruction under Regulation 103 of the Road Vehicles (Construction and Use) Regulations 1986, including the offence of unnecessary obstruction. This states that no person in charge of a motor vehicle or trailer shall cause or permit the vehicle to stand on a road so as to cause any unnecessary obstruction of the road. Only the Police can enforce this and make the decision as to whether a trailer or caravan is causing an unnecessary obstruction. The outcome of each investigation will depend upon many factors, such as the size of the trailer or caravan, the type of road, its position in the road and the use of the road.