Vehicle and Traffic (Heavy Vehicle Charges) Regulations 2017

For the purposes of these regulations (other than the definitions of single axle group, tandem axle group, twinsteer axle group, tri-axle group and quad-axle group) – 2 axles less than one metre apart are to be regarded as one axle; and 3 axles not more than 2 metres apart are to be regarded as 2 axles; and 4 axles not more than 3.2 metres apart are to be regarded as 3 axles.

A reference to a distance in subregulation (1) is a reference to the horizontal distance between the centre-lines of – in the case of subregulation (1)(a), the 2 axles; and in any other case, the outermost axles.