Restricted areas, size limits and warning triangles

Road rules and advice for heavy vehicle drivers in NSW. Understand restricted areas, height and length limits, and using warning triangles.

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Restricted areas for road trains and B-doubles

All approved routes are listed in the road train permit notice, and appear on the road train map. You must carry all required permit notices.

B-doubles can operate on all approved road train routes as well as on the state-wide network of B-double routes. You must carry the required permit notices.

Height and length limits

For detailed information see heavy vehicle road access.

Light traffic roads

If a weight restriction sign is displayed for a road, you must not use that road if the total weight of your vehicle, including its load, is the same as or heavier than the weight shown on the sign.

Road signs indicating weight restrictions on heavy vehicle use
Road signs indicating weight restrictions on heavy vehicle use

Load limit sign

You must not drive past a BRIDGE LOAD LIMIT (GROSS MASS) sign or GROSS LOAD LIMIT sign if the total of the gross mass (in tonnes) of your vehicle, and any vehicle connected to it, is more than the gross mass indicated in the sign.

No trucks sign

Drivers of long or heavy vehicles, except buses, must not drive past a NO TRUCKS sign unless the vehicle is equal to or less than the mass or length specified on the sign.

When the sign does not provide detailed information, no truck (ie GVM greater than 4.5 tonnes) is permitted to drive past the sign, unless the driver's destination lies beyond the sign and it is the only route.

'No trucks' road sign
'No trucks' road sign

Trucks must enter sign

Heavy vehicles drivers must enter the area indicated by information on or with this sign.

Trucks must enter signage
'Trucks must enter' road sign

Warning triangles

A vehicle, or a vehicle and trailer, with a GVM of more than 12 tonnes, must carry 3 portable warning triangles to use if the vehicle breaks down.

If a vehicle required to carry warning triangles stops, or the load being carried by the vehicle falls onto the road and is not visible for 200m in all directions, the driver must put:

  • the first triangle 50-150m from the front of the vehicle or fallen load
  • the second triangle 50-150m from the rear of the vehicle or fallen load
  • the third triangle at the side of the vehicle or fallen load, in a position that gives sufficient warning to other road users of the position of the vehicle or fallen load.
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