FineFlip Guide
Mobile Speed Camera: Can You Challenge It?
Mobile speed cameras — operated from vans, tripods, or handheld by officers — are responsible for a significant proportion of UK speeding fines. Unlike fixed cameras, they rely on a human operator and portable equipment, which introduces more potential for error. This guide explains how they work and when you can challenge the evidence.
Caught by a mobile camera?
Operator error and calibration issues are more common with mobile units. FineFlip checks your case.
Check my appeal freeTypes of mobile speed cameras
Mobile speed detection uses several technologies: laser guns (LTI 20/20, Ultralyte), radar devices, and van-mounted camera systems (often using laser or video). Each has different strengths, weaknesses, and challenge points.
The cosine effect
Laser and radar devices measure speed most accurately when pointed directly at an approaching or receding vehicle. When the device is positioned at an angle to the road, the "cosine effect" can produce artificially low or high readings. If the operator was positioned at a significant angle, the reading may not be reliable.
Common appeal grounds
- Operator was not properly trained or certified for the device
- Device calibration certificate was expired or unavailable
- No deployment log or the log has inconsistencies
- The cosine angle exceeds acceptable limits
- The laser locked onto a different vehicle in traffic
- Weather conditions (rain, fog) affected the reading
- The NIP was served late
How to request evidence
Write to the camera partnership or police force and request: the operator's training certificate, the device serial number and calibration records, the deployment log showing setup time, location, and angle, and any photographs or video from the session.
Related guides
Frequently asked questions
Are mobile speed cameras accurate?
Mobile speed cameras using laser technology (LTI, Ultralyte) are generally accurate when used correctly. However, operator error, incorrect positioning, the cosine effect, and lack of calibration can all produce inaccurate readings.
Do mobile speed camera vans need to be visible?
There is no legal requirement for speed camera vans to be visible or signed. The previous practice of making cameras visible was a policy choice, not a legal obligation. However, if the van was positioned in a deceptive location, this may support mitigation arguments.
Can I request the operator's training records?
Yes. Under disclosure obligations, you can request the operator's training certificate, the device calibration record, and the deployment log for the session when your reading was taken.