Mass limits
General Mass Limit (GML)
The GML are the mass limits that apply for all heavy vehicles unless they are operating under an accreditation or an exemption under the Heavy Vehicle National Law.
Information about GML is available on the National Heavy Vehicle Regulator (NHVR) website.
Concessional Mass Limit (CML)
Only those transport operators accredited under the Mass Management module of the National Heavy Vehicle Accreditation Scheme (NHVAS) are eligible to operate under CML.
Information about CML and the NHVAS is available on the NHVR website.
Higher Mass Limits (HML)
HML provides a significant increase in the productivity of road freight transport vehicles.
In NSW, vehicle types eligible to operate at HML are:
- Short combinations (standard six axle semi-trailer)
- B-doubles
- Type 1 Road trains: A-doubles, B-triples, AB-triples up to 36.5m in length and Modular B-triples
HML eligibility requirements
Vehicles must:
- not exceed the manufacturer's gross vehicle mass for the rigid truck or gross combination mass for the prime mover
- have all axles in the combination operating at HML fitted with road friendly suspension (with the exception of the steer axle) certified in accordance with the Commonwealth Vehicle Standards Bulletin (VSB) 11
- comply with all conditions and mass limits for the vehicle contained in the New South Wales Higher Mass Limits Declaration
- comply with all conditions for the vehicle type contained in the relevant National Class 2 Heavy Vehicle Authorisation
- be enrolled in the Intelligent Access Program (IAP) or Telematics Monitoring Application (TMA)
| Notice | |
| Supporting Documents | New South Wales Higher Mass Limits Declaration 2025 - Information Sheet |
| Network | The HML networks on the National Network Map. Conditions applied to the GML networks for the relevant vehicle also apply to the HML network. |
| Permit | Operators seeking to travel on roads that are not on the approved network must obtain a permit. Information on applying for a permit is available on the NHVR website. |
Further information about HML is available on the NHVR website.