matkin2007 said:

Buy a snooper 3zero camera detector if you need to speed, detects lazer, radar and fixed cameras by satellite. It's kept me out of trouble

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Better would be to stay alert, and look well ahead, and moderate the speed to the conditions. Mostly speed detection is done where situations are higher risk, or there is a history of speeding.

Lazer camera detectors will alert you if the lazer beam hits it, but the beam is quite precise so can be missed by the detector.

Radar cameras are mostly taking readings from behind you as you pass. The only radar to be detected will be that reflected to your detector from other objects. With no oncoming traffic, you may not get the warning.

Fixed camera data needs to be updated, but not such a problem as new cameras are rare.

Average speed cameras will not be seen by any detector, or be on any database, but your eyes should be enough, both for the cameras and the speedometer.

portland_bill said:

Better would be to stay alert, and look well ahead, and moderate the speed to the conditions. Mostly speed detection is done where situations are higher risk, or there is a history of speeding.

Lazer camera detectors will alert you if the lazer beam hits it, but the beam is quite precise so can be missed by the detector.

Radar cameras are mostly taking readings from behind you as you pass. The only radar to be detected will be that reflected to your detector from other objects. With no oncoming traffic, you may not get the warning.

Fixed camera data needs to be updated, but not such a problem as new cameras are rare.

Average speed cameras will not be seen by any detector, or be on any database, but your eyes should be enough, both for the cameras and the speedometer.

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Actually you will find that average speed tests (specs) are on the database. I update the device around once a month.

Even my TomTom knows where the average speed cameras are (when I bother to update it that is).

Usual ACPO guideline is 10% +2 mph, so you can theoretically get away with 79mph etc. However, the reason for the leniency is inaccurate speedos and it's very difficult to stay at exactly a speed as indicated by the speedo whilst paying attention to everything else.

Many areas actually work on 10% + 5mph, as they'd catch many people at the ACPO rate.

Can't say for the M25, but all other mandatory limits on motorways (speed with a red ring around it) are enforced by effectively a digital version of a Gatso camera, ie you only get done at the location of the camera. Average speed camera are usually at road works sites, although there are a few at permanent reduced limits on other areas.

Contrary to popular belief, all the cameras are well signposted and there is no appetite to catch people speeding - to get the motorway to flow, you need people to do the displayed limit, so there's no benefit in getting £60 off an odd motorist if it results in congestion.

DueUno said:

so there's no benefit in getting £60 off an odd motorist if it results in congestion.

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From end July this year, all the £60 fines went up to £100. Points stay at 3 per offence.