We have a received a request under the Freedom of Information Act 2000 for the following:
“I am trying to discover how accurate Gatso speed cameras are.
I would like the Home Office to provide me with the following information on Gatso cameras.
What is the working tolerance in miles per hour of Gatso speed cameras at the time of calibration.
What is the allowed overall variation in tolerance over the 12 month period between tests.
What degree of inaccuracy of Gatso speed cameras has been found when undergoing their annual tests.
Gatso speed cameras consist of two parts with individual serial numbers. What is the accuracy and tolerance of the individual parts. Are both parts always kept together and tested together, or is the photographic section used with several different electronic units. In West Yorkshire cameras are moved from site to site and there is only one camera for each 5 road side boxes.
Why is the test data not put on the calibration certificates, copies of which are supplied to the public. The information on certificates supplied by enforcement departments is useless.
Why is there no approved “British Standard” for speed cameras.
When enforcement departments supply photographs of alleged speed offences the speed is shown in miles per hour they do not show any tenths or hundredth of miles per hour, this indicates that they have a wide tolerance and are not accurate. Is the speed shown on photographs rounded up or down to the nearest whole mile per hour”
We released the following information on 21 May 2007.