A heavy vehicle is defined in the Heavy Vehicle National Law (HVNL) as a vehicle that has a gross vehicle mass (GVM) or aggregate trailer mass (ATM) of more than 4.5 tonnes. The GVM of a vehicle is the maximum it can weigh when fully loaded, as specified by the manufacturer.
For example, heavy vehicles include:
- B-double freight trucks
- road trains
- passenger buses
- vehicle carriers
- livestock and other agricultural vehicles
- mobile cranes and other special purpose vehicles.