Heavy vehicle average speed enforcement

Heavy vehicle average speed enforcement involves measuring the average speed of heavy vehicles over long distances.

Frequently asked questions

  • Average speed enforcement is a traffic safety system based on digital camera technology with automatic number plate recognition.
  • Average speed enforcement works by measuring the amount of time it takes a heavy vehicle (a mass greater than 4.5 tonnes) to drive between two camera sites and then calculates the average speed of the vehicle.

    If the vehicle’s average speed is higher than the speed limit for the length of road, the driver will receive a speeding infringement.

    All average speed enforcement lengths are certified by a registered land surveyor to ensure the accuracy of average speed calculations. The distance used when calculating a vehicle’s average speed across an average speed enforcement length will be the shortest practicable distance to ensure there is no possibility a driver’s speed can be overestimated.

    Average speed enforcement promotes area-wide suppression of speeding because speed enforcement is sustained over a length of road rather than a single point. Overseas research has shown 50% reduction in fatal and serious crashes after average speed cameras were installed.

  • Average speed enforcement is currently only used to enforce heavy vehicle speeding.
  • Average speed enforcement targets heavy vehicles because they are often involved in serious road crashes. Heavy vehicles make up only 3% of vehicle registrations and 7% of kilometres travelled by NSW vehicles however are involved in almost 20% of road fatalities.

    Average speed enforcement is also more suited to the long distances heavy vehicles travel.

    Research from the National Transport Council has suggested that if all heavy vehicles complied with speed limits, there would be a 29% reduction in heavy vehicle crashes.

  • Average speed enforcement lengths have been selected using criteria developed by the NSW Centre for Road Safety. Site selection is based upon several factors including the frequency of heavy vehicle crashes, heavy vehicle speeds and road conditions.
  • Average speed enforcement is used to enforce existing speeding offences. However, an additional demerit point will be incurred by heavy vehicle driver’s detected speeding through an average speed enforcement area. This is because offences detected by average speed enforcement demonstrate a continued intention to speed.
  • Yes, average speed enforcement lengths are signposted with one advance warning sign on each approach which display a camera image and the text 'AVERAGE SPEED SAFETY CAMERA AHEAD'.
  • It is not intended that average speed enforcement replaces police enforcement on heavy vehicle routes. NSW Police enforce a wide range of offences including speeding and for the safety of road users it is necessary that this enforcement continues in average speed enforcement lengths.

    Speeding infringements and suspensions issued by NSW Police will continue to apply regardless of whether the driver also receives a speeding infringement from the average speed camera.

  • Average speed cameras are subject to rigorous testing, certification and calibration in accordance with legislated requirements.

    Roads and Maritime has developed strict operational guidelines for speed cameras to ensure they are robust and accurate.

  • Average speed enforcement lengths enforce the sign posted speed limit along that length. Where there are multiple posted speed limits, the ‘average speed limit’ will be calculated.

    The ‘average speed limit’ is calculated by measuring the part of an average speed enforcement length that each of the different speed limits applies to. The distance of each part and their respective speed limits are used in a legislated formula that will calculate the ‘average speed limit’ allowed for by the average speed enforcement length.

  • Average speed cameras record photographs of vehicles as they pass the start and end points of an enforcement length. The cameras also record the licence plate of the vehicle and the exact time the camera took the photograph.
  • Yes, average speed enforcement can be used to prove speed limiter non-compliance.
  • If you were not driving the vehicle at the time of the offence, you should provide the name and details of the driver by completing the statutory declaration form provided with the penalty notice and forward it to the State Debt Recovery Office for processing.

    If you wish to view the photographs of your offence, you can view these on the Revenue NSW website free of charge.

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