Definitions and specifications for heavy motor vehicles

This section explains important terms and vehicle specifications that heavy vehicle drivers need to know to operate vehicles safely and legally. You may be tested on your knowledge of these during the learner licence theory test for each class of heavy vehicle licence, so it’s important that you study this section carefully.

General heavy motor vehicle definitions and specifications

An overview of general heavy motor vehicle definitions and specifications.

Heavy rigid motor vehicle definitions and specifications

A heavy rigid motor vehicle is a vehicle with two axle sets, a driver’s position, a steering system, motive power and a single rigid chassis.

Heavy combination vehicle definitions and specifications

An overview of heavy combination vehicle definitions and specifications.

Heavy combination motor vehicle types

An overview of heavy combination motor vehicle types.

Stability

Drivers of large vehicles have an obligation to drive considerately and professionally at all times.