The Heavy Vehicle National Law (HVNL) regulates the use of heavy vehicles that have a gross vehicle mass of more than 4.5 tonnes. It applies nationally, except for Western Australia and the Northern Territory.
In all jurisdictions where the HVNL applies, legislation is in place that adopts the HVNL as a law of that jurisdiction.
The NTC manages maintenance and improvement of regulatory improvements to the HVNL. The National Heavy Vehicle Regulator (NHVR) administers and enforces it.