Semi-trailers, B-doubles and other combinations fitted with quad-axle groups can carry heavy loads more safely on a defined road network.
The NHVR will conduct a comprehensive review and redesign of the existing National Class 2 Heavy Vehicle Road Train Authorisation (Notice) 2015.
A new National Class 2 Heavy Vehicle B-double Notice commenced on 1 February 2019.
Common class 2 heavy vehicles include: freight-carrying vehicles (B-doubles, B-triples, road trains), buses, vehicle carriers, livestock vehicles and Performance-Based Standards (PBS) vehicles.
A road train permit is required for travel on a road outside of the approved road train network.
A PBS permit is required for travel on or off the PBS network for that level of vehicle, unless it complies with the mass, dimension or operating requirements set out in a gazette notice.
A B-double permit is required for travel on a road outside of the approved B-double network.