General freight carrying vehicles that are longer than 19m require specific networks that are capable of handling these larger vehicles. This is usually managed by declaring route networks in gazette notices, but where a network does not exist, an operator may apply for a permit. There are a number of common class 2 heavy vehicle combinations, including:
- B-doubles are a class 2 heavy vehicle that consist of a prime mover towing two semitrailers, with the first semitrailer being attached directly to the prime mover by a fifth wheel coupling and the second semitrailer being mounted on the rear of the first semitrailer by a fifth wheel coupling on the first semitrailer. A B-double must comply with prescribed mass and dimension requirements.
- B-triples are categorised as road trains and must comply with prescribed mass and dimension requirements. B-triples sometimes have dedicated networks declared that may be different to road train networks.
- Road trains are a class 2 heavy vehicle that consist of a motor vehicle towing two or more trailers (excluding converter dollies supporting a trailer). Road trains must comply with prescribed mass and dimension requirements.
A bus, other than an articulated bus, that is longer than 12.5m but less than 14.5m, that complies with prescribed mass and dimension requirements is a class 2 heavy vehicle. These vehicles are also known as a ‘Controlled Access Bus’.
A vehicle carrier is a combination designed and built to carry vehicles on more than one deck that together with its load is longer than 19m or higher than 4.3m.
A livestock vehicle is a heavy vehicle, or a combination, that is higher than 4.3m and is built to carry cattle, sheep, pigs or horses.
Performance-Based Standards (PBS) vehicles
PBS vehicles are defined as class 2 heavy vehicles. There are four levels within the PBS Scheme, and these vehicles must meet safety and infrastructure standards and are designed to offer higher levels of safety and productivity. PBS vehicles are able to operate on road networks that have been classified as suitable for their level of performance. Visit Performance-Based Standards for more information.