Wis. Admin. Code § Trans 251.01
(2) “Axle-group” means one or more axles which support one end of a vehicle.
Note: Normally a motor vehicle or a trailer will have 2 axle-groups and a semi-trailer only one axle-group under this definition, but a trailer may also have only one axle-group if it is located near the center of the trailer with the trailer and load balanced over it.
History: Cr. Register, January, 1982, No. 313, eff. 2-1-82.