Braking Systems for B-Doubles and Road Trains - Tasmania


You must comply with one of the following Australian Design Rules if you manufacture a prime mover used in a B-double or a vehicle used in a road train:

  • second edition ADR 35A or
  • third edition ADR 35.

If you operate a prime mover in a B-double that fulfils one of the following conditions, you must have also had an anti-lock braking system complying with third edition ADR 64:

  • built after 1989
  • first used in a B-double after 1993 or
  • is used in a B-double that includes a road tank vehicle carrying dangerous goods.

If you operate or modify a heavy trailer used in a B-double or road train, you must comply with ADR 38.

Australian Design Rule 35 specifies the breaking requirements on commercial motor vehicles and larger passenger vehicles.

Australian Design Rule 64 specifies additional design and construction requirements for hauling vehicles designed to be used in road trains and B-doubles.

Australian Design Rule 38 specifies requirements for braking under both normal and emergency conditions for trailer brake systems.

Please consult the Contact Officer for more information and to ascertain the level of compliance that may be required.

Service type

Code of Practice

A code of practice is a set of rules which details how people in a certain industry should behave. A code of practice can be defined as a result of legislation or by industry regulators and bodies.

Act(s) name

Heavy Vehicle National Law (Tasmania) Act 2013 Tasmania

Regulation(s) name

Heavy Vehicle National Law (Tasmania) Regulations 2014 Tasmania

Administering agency

National Heavy Vehicle Regulator

Contact details

Contact Email, Phone and Address Details for this service in simple two column table format, header then data.

Please use these contact details for help or more information:

General Enquiries

National Heavy Vehicle Regulator

Operating address: Level 9, Green Square North Tower
515 St Pauls Terrace
Fortitude Valley
Queensland 4006
Mailing address: PO Box 492
Fortitude Valley
Queensland 4006
Phone: 1300 696 487
Fax: 07 3309 8777