Frequently Asked Questions - Mass, Dimension and Loading

The questions and responses on this page have been identified through stakeholder engagement with industry, local government agencies and representatives throughout all states and territories, and reflected the agreed position at the time of writing. For further advice and information please contact us.

Operators operating at Concessional Mass Limits (CML) have access to the same network that their particular vehicle class is permitted to operate under General Mass Limits, except where prohibited by a load limit specified for a road, bridge or causeway by a sign or notice.

See our Concessional Mass Limits page for more information.

No, but operating under Concessional Mass Limits (CML) requires the operator and vehicle to be enrolled under the NHVAS Mass Mangement module and it is a requirement of this scheme that you ensure the suspension is maintained.

See our Concessional Mass Limits page for more information.

For access to QLD and NSW HML routes you will need a certified tracking system fitted to the vehicle. In SA you require IAP if you do not complete and carry a HML route compliance certificate.

See Intelligent Access Program for more information.

Yes. See Higher Mass Limits page for more information.

The following axle mass limit increases apply for vehicles fitted with road-friendly suspensions operating at Higher Mass Limits (HML):

  • 0.5 tonne increase on tandem axle groups to 17 tonnes 
  • 2.5 tonne increase on tri-axle groups to 22.5 tonnes 
  • 1 tonne increase on single drive axles on buses to 10 tonnes 
  • 1 tonne increase on six-tyred tandem axles to 14 tonnes 
  • 0.7 tonne increase on steering axles of long combination vehicle prime movers (i.e. road trains and similar) fitted with wide single tyres, regardless of suspension type.

Before operating under HML, we strongly recommended you check the HML transition notice relevant to the jurisdiction you will be operating in to ensure that you conform to potential minor variations from the national policy.

See Higher Mass Limits for further information.

Under Concessional Mass Limits, the Gross Vehicle Mass of vehicles with tandem and tri-axle groups are set at 5% above General Mass Limits (GML), subject to:

  • a maximum increase of 1 tonne for a vehicle or vehicle combination with an allowable gross vehicle mass not exceeding 55 tonnes (e.g.: 6-axle semi-trailer)
  • a maximum increase of 2 tonnes for vehicle combinations with an allowable gross vehicle mass exceeding 55 tonnes (e.g.: 9-axle B-Double)
  • an upper limit on axle and axle group mass as given in the table of Concessional Mass Limits.

Note: In Queensland, as a means of providing more flexibility to operators, the mass limits that apply in CML are extended to include the following mass limit increases:

  • In Queensland a maximum increase of 3 tonnes for vehicle combinations with an allowable gross mass exceeding 85 tonnes but not exceeding 120 tonnes
  • In Queensland a maximum increase of 4 tonnes for vehicle combinations with an allowable gross mass exceeding 120 tonnes.

See our Concessional Mass Limits page for more information.

 

 

A comprehensive list of the mass limits under the HVNL can be found on our General mass and dimension limits page.