Centre for Road Safety

Our video has simple steps you can take to ensure your vehicle is not overheight. Read a transcript.



In NSW, any heavy vehicle that is higher than 4.3m must comply with restricted travel conditions and use an approved road network. NSW has more bridges and tunnels with low clearances of less than 4.6m than any other state in Australia. Vehicles higher than 4.3m must not travel under or through them.

Drivers of overheight vehicles that try to use major Sydney motorways, such as the Sydney Harbour Tunnel, put other road users at risk and cause major damage to our roads. Since 1 July 2015, there have been bigger penalties for overheight offences, including an increase in fines from $2200 to more than $3700.

Know your vehicle height and road routes

Restricted travel conditions and approved road networks apply to:

  • Vehicles constructed to a height that exceeds 4.3m
  • Vehicles carrying a load that together with the vehicle, exceeds an overall height of 4.3m
  • Vehicles that have a variable height, such as a tipper or the boom of a crane, where its overall travel height exceeds 4.3m
  • Loads that have a variable height, such as an excavator transported on a trailer, where the overall height exceeds 4.3m


How high is your vehicle?

Total vehicle height What you should do
4.3m and under Plan your routes and take notice of low clearance signs, as some infrastructure, such as railway bridges, have a clearance height of less than 4.3m
Between 4.3m and 4.6m Take a network of roads approved for vehicles up to 4.6 m in height. Use the Roads and Maritime website
Restricted Access Vehicle Maps
Above 4.6m Get a specific permit for the journey from the National Heavy Vehicle Regulator (phone 1300 696 487)


Simple steps you should take before you start your journey:

  • Make sure you know the combined height of your vehicle and its load before driving. Check the height of your load using a height stick, measuring tape, laser technology or electronic measuring device
  • Take notice of safety systems in your vehicle - alerts, warnings and locks can help you avoid overheight vehicle incidents
  • Do not rely on GPS navigation systems
  • As a last resort to avoid getting stuck, look out for clearance signs on the roadside to warn you of low bridges or tunnels ahead.