Use of Auxiliary Brakes in Heavy Vehicles

This report reviews the use of auxiliary brakes by drivers of heavy vehicles on long and steep descents. The research was in response to several serious incidents involving runaway trucks on long, steep grades and continued noise complaints from the community.

The research included a substantial literature review, surveys of truck drivers and local governments, field testing, and the development of a simulation program to assess differential speed limits on long steep grades.

It is important heavy vehicle drivers understand how to correctly use the auxiliary brake system for their own safety and the safety of other road users. The report proposes a driver training framework which includes elements of safe, efficient and polite driving.

It also recommends that Australian regulators consider mandatory auxiliary brake system performance requirements for certain categories of heavy vehicles.