Pressure-sensitive sensors in each lane emit a highly precise signal when a pair of wheels (a vehicle axle) pass a certain spot in the road. A speed meter registers these signals and calculates the speed for each axle and sends these data to the camera equipment. The speed meter is checked and certified every year by the Norwegian Metrology Service, and the speed camera is not able to take photographs without valid certification.
The speed camera takes a picture if the speed of the first axle is higher than a set limit (the photo limit). The photograph is checked manually by the Norwegian Public Roads Administration and then transferred to the police.
For spot-speed control, a photo zone is marked in the road where the photograph is taken. The photo zone is 80 cm wide and is marked by two white lines, sometimes with a centre line (photo line) in addition. In the photograph, the front wheels of the vehicle should be in the photo zone.
The camera is installed in the speed camera box and consists of a digital camera, a flash lamp, and a computer.
- Vehicles that drive at legal speed are not photographed.
- All photographs and data are encrypted and can only be opened with the correct decryption key.
If you have been photographed by a speed camera and have questions about this, you should contact the police in the district where you were photographed. You can reach the police on tel. 02800.