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Modified Vehicles

Vehicle owners may modify their vehicle for improved efficiency, or to reduce running costs and emissions. Modifications can be broadly classified in three categories:

  • Structural modifications include changes to the vehicle form, such as lightweighting and aerodynamic drag reduction.
  • Mechanical modifications involve changing the way a vehicle operates, through upgrade or replacement of key components such as engines and transmissions.
  • Alternative fuel conversions involve modification of conventionally fuelled vehicles to operate on other fuels, such as LPG, natural gas or electricity.

Vehicle Standards and Legislation

The standard of vehicles on South Australian roads is set by the Road Traffic (Vehicle Standards) Rules 1999 under the Road Traffic Act 1961. Vehicle standards apply to motor vehicles, trailers and combinations operating on roads and road-related areas. Standards are generally related to the Australian Design Rules (ADRs).

Heavy vehicles

Modifications to heavy vehicles are set out under a National Code of Practice published as a Vehicle Standards Bulletin, with the intent of assuring continued compliance with applicable ADRs.

The Code of Practice provides advice for those performing modifications on procedures that, if followed, result in ongoing ADR compliance.

Light vehicles

Low emission modifications to light vehicles typically include alternative fuel conversions, most commonly to LPG or electricity. The Australian Government offers a significant rebate for LPG conversion. The South Australian Government also provides detailed information specific to electric vehicle conversion.

This page provides an overview only. Click here for up to date details on vehicle standards in South Australia.