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this post was submitted on 28 May 2026
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This is more a chart demonstrating bad road design or regulation, and the incompetence of the enforcement. Either the roads are designed in such a way that huge numbers of people feel safe driving at these speeds (because the speed limit is too low, or the road designed unsafely) or there is a large number of unsafe drivers who only stopped in the presence of cameras, and who went right back to unsafe driving without issue.
This is a chart demonstrating that speed cameras are sometimes an effective intervention for an otherwise badly designed road.
...thus proving the effectiveness of cameras...
Only if you have cameras on literally every road. No substantial action is being taken, so they go right back to dangerous driving as soon as they aren't on-camera, as this graph seems to indicate.
Deal
It's quite difficult to retroactively adjust the traffic speed, without causing knock on issues.
A road might have been designed to cope with 50, but hidden junctions, or pedestrians might knock it down to a 30. Making it feel like a 30 is quite different.
I'd personally prefer other, more polite methods. In the UK, the signs showing your current speed in either green (good) or red (too fast) are remarkably effective. I accept that speed cameras are needed when the other methods fail.
Proviso, the cameras should be blatantly obvious, with no ambiguity over the limit. It should only catch people both deliberately speeding, and not paying enough attention to spot the risks of speeding.