There are four types of speed detection methods used in Queensland. They are:
1. Speed detection devices
The Queensland police can use any of the following speed detection devices:
- Dash-mounted radars used in police patrols cars;
- Hand-held lasers (also known as LIDAR);
- Mobile speed cameras; and
- Fixed speed cameras.
Speed detection devices are the most reliable form of detecting speed, however in many cases the devices have been proven to be inaccurate or not used correctly.
2. Follow speed
The follow speed method is used where the speed of a vehicle is determined by comparing it to the speed of a following police car. This is a highly unreliable method given the variances that can apply.
The estimation method is used where a police officer observes a vehicle and makes an estimation about the vehicle’s speed based on the officer’s experience and knowledge. This method lacks accuracy but may in some cases be sufficient to at least show that a vehicle was exceeding the speed limit.
It should be noted that the more experienced the police officer is, the more accurate their estimation will be and therefore the more likely the court will be to accept their evidence.
4. Speed formula
The final method to detect a driver’s speed is to rely upon the time that a vehicle takes to travel over a known distance. This can be achieved by either using an electronic time switching mechanism or the manual actuation of a timing device. This method is generally used by the police as a last resort.
The formula used to determine a driver’s speed is (D x 3.6) / T where:-
- D is the shortest practicable distance between 2 known points, expressed in metres and rounded down to the next whole number; and
- T is the time that elapsed between the vehicle passing the 2 known points, expressed in seconds.
Frequently Asked Questions
Q: Is it possible to dispute a speeding offence?
A: Absolutely. It does not matter which method was used to detect your vehicle’s speed. If you disagree that you were driving at the speed that is being alleged, you should seek legal advice about contesting the charge.
Please contact us for more information about speed detection methods in Queensland.