Speed camera detectors: what they actually detect
Last updated August 2026 · McFlash editorial team
Radar detectors and speed cameras are often sold as one topic. They are not. Whether a detector helps depends entirely on how the camera measures your speed.
Camera types and whether a detector helps
| Type | How it measures | Detector helps? |
|---|---|---|
| Mobile radar van | Emits K or Ka radar | Yes |
| Handheld LiDAR | Infrared laser pulse | Alert usually arrives after measurement |
| Fixed pole camera | In-road loops or piezo strips | No signal to detect |
| Average-speed zone | Plate reads at two points | No |
| Red-light camera | Loop triggered by signal phase | No |
What to use for each
- Live enforcement (officers with radar or LiDAR): a radar detector is the right tool — it hears the emission.
- Fixed and red-light cameras: a navigation app with a camera database, because their locations are static and known.
- Average-speed zones: simply hold the posted limit end to end; nothing else works.
Used together, an app covers the static hardware and a detector like McFlash covers the live radar an app has not been told about yet.
FAQs
- Can a radar detector detect speed cameras?
- Only cameras that actively emit radar, such as some mobile radar vans. Fixed cameras that use in-road induction loops or piezo sensors emit nothing, so no detector can hear them.
- Do detectors work on average-speed zones?
- No. Average-speed systems read your plate at two points and calculate the time between them. There is no signal to detect — the only defence is holding the limit through the whole zone.
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