Topics / Safety / Three-axle bus mass limits review

Investigating whether mass limits should be increased for three axle buses.

Three-axle bus mass limits review

  • Scoping > 
  • Analysing issues > 
  • Analysing options > 
  • Implementing


This project will identify whether there is a need to increase the mass limits that apply to three-axle buses and assess the potential implications.

For some time, there has been a mismatch between regulatory provisions for determining bus occupancy numbers and those setting maximum axle mass limits. Bus mass has increased for several reasons, including the increased average weight of the Australian population over recent years and the increased tare weight of buses as a result of regulatory requirements for specific safety and environmental improvements.

Next steps

Request for tender

Following a tender process, the NTC are appointing an external consultant to collect data to help inform its assessment of the appropriateness of a gross mass limit for three-axle buses.

The tender process closed on 19 March 2018 and we are now in the process of analysing the proposals submitted. 



In February 2014, the NTC released a discussion paper Mass Limits for Two-Axle Buses, which identified and discussed options to facilitate an increase in mass limits for buses fitted with two single axles.

The same concerns – increased tare mass of vehicles due to modern regulatory requirements, and the increase in average mass of Australians – affect the operation of three-axle buses.

However there are also other issues associated with three-axle buses, which are more widely used in long haul, tourist and charter operations, where a component of their gross mass is likely to include passenger baggage and small parcel freight.

Find out more


Get involved

Contact us

Project Manager Melanie Learson
Last Updated: 20/3/2018