Speed Camera Calibration
There are a number of possible speeding defences surrounding the correct use and calibration of the speed camera. In general, speed cameras need to be calibrated on an annual basis. If your case goes to court, you can ask for the calibration certificate. In the case of some mobile speed cameras, certain daily checks ned to be carried out by the person operating the speed camera or other device.
Police Officer Evidence
If the speeding prosecution is not based on evidence using a speed recording device, then it is necessary for there two witnesses (these winesses may be police officers). If you were only seen by one police officer and no other police officer or other witness, this may prove to be a valid defence.
Hidden Speed Traps
There would appear to be no legislation stating that speed cameras or officers need to be clearly visible or that warning signs need to be displayed. However, ACPO guidelines state that officers performing speed checks need to be in a position that is clearly visible to the public and should wear fluorescent jackets. In addition, the use of speed camera equipment in such situations should be to confirm that a vehicle which the officer believes to be speeding is in fact speeding. He should not just point it at all oncoming vehicles indiscriminately.
Special Reasons Speeding Mitigation
You may be able to plead exceptional reasons to mitigate (although not defend) your case. Special reasons can apply to, amongst others, fleeing from assault, emergency travel to hospital etc
