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New Heavy Vehicle Chart

The NHVR recently released a new chart outlining the different heavy vehicle combinations – 39 in all, including information on a vehicle’s class, length and its weight limits.

This chart is extremely user-friendly and assists those, especially when choosing truck spares.

This new heavy vehicle chart has been designed to be user-friendly, to help everyone understand and comply with the new national heavy vehicle regulations. It is important that everyone has a much better understanding of the industry overall, especially for operators to gain a better understanding of the conditions needed to access the road network.

The new chart has been designed with 6 categories including general access semitrailer combinations, general access rigid trucks, Class 2 B-double combinations, Class 3 rigid truck and trailer combination, Class 2 type 2 road trains and Class 2 type 1 road trains.

The Australian Trucking Association has supported the NHVR chart agreeing that this document will complement the ATA/ITC Truck Impact Chart (TAP) – which is used to compare different truck combinations.

The chart also supports the NHVR’s National Harmonisation Programme that works with the heavy vehicle industry on national notices for road trains, agricultural vehicles and combinations, B-Doubles and higher mass limits.

General Mass and Dimension Limits

The National Heavy Vehicle mass and dimensions limit fact sheets includes information on –

  • General Mass Limits including detailed information on axle mass limits and axle spacing, and information on the methods used to assess compliance with heavy vehicle mass requirements
  • 1-Tonne Tri-axle mass transfer allowance
  • General dimension requirements
  • Heavy vehicle dimension assessment – compliance and enforcement
  • Width – width limit for vehicles is 2.5 meters (exclusions apply)
  • Height – the height limit for heavy vehicles is 4.3 meters unless it is a vehicle used for carrying livestock, for carrying cars or is a double decker bus
  • Length – length varies according to the truck – general access vehicles, trailers, refrigerated van trailers, car carriers and livestock carriers and semi-trailers all have their own individual length specifications
  • Rear overhang and rear overhang line – the rear overhang of a vehicle is the distance between the rear of the vehicle and the rear overhang line of the vehicle
  • Rear overhang on rigid trucks – Lesser of 3.7 meters or 60% of the wheelbase
  • Rear overhang on semi-trailers and dog trailers – Lesser of 3.7 meters or 60% of *S* dimension
  • Rear overhang on a pig trailer – the rear overhang on a pig trailer is not to exceed the lesser of the length of the road carrying area, forward of the rear overhang line or 3.7 metres
  • Dimensions relating to specific trailer types – these include Livestock carriers, refrigerated van trailers and car carriers.

More detailed information on the new guidelines can be found at

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