M25 and the M11 will be equipped with Point to Point speed devices from August 1st 2009*
Once you enter the M11 for instance, you pass a camera that takes a photo of your car and registration number and records the exact time, upon exit another camera takes a photo of your car and registration number, and records the exact time you leave the motorway.
The Cameras are set at fixed points. With both the start time and finish time, a computer is able calculate the time it has taken for you to travel between the two fixed points, and works out your average speed and how many miles you may have travelled over the national speed limit and If you have completed the clocked journey too fast you are given a speeding ticket.
At the present time the national speed limit for motorways is 70 M.P.H. For every minute that you drive over the speed limit you will incur a fine of £30, and one point on your licence. The fines will be issued automatically there will be a variance of 10% for 3 months, which gives a top speed of 77mph until the end of October 2009.
There will be cameras fitted at all exit points along the motorways. Remember that now with the new legislation; fighting speed camera fines is almost impossible. You must prove the device is faulty and if you are not a technician working on them, you have no chance of beating the fine.