The Road Vehicles (Construction and Use)(Amendment)(No. 2) Regulations 2010
Regulation 8 of the Road Vehicles (Construction and Use) Regulations 1986 specifies the maximum permitted widths of road vehicles. It is an offence to tow a trailer which exceeds the relevant width. A maximum width of 2.3 metres is (with certain exceptions) specified in the case of a trailer drawn by a motor vehicle having a maximum gross weight of 3500 kg or less.