OK I know stats can be fiddled to basically back up whatever you want but these seem pretty clear cut to me.
http://www.bbc.co.uk/news/uk-scotland-11584778
Quote:
The introduction of cameras on Scotland's roads has led to a fall in the number of fatal and serious accidents, new figures have suggested.
Data from the chief statistician revealed the average number of people killed or seriously injured had fallen by 56% at camera sites between 2007-09.
That compares with a 38% drop in such accidents across all Scotland's roads over the same period.
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Seems to be that whilst they aren't popular with some motorists, mostly the ones who seem unable to see a bright yellow box coming up and modify their speed accordingly

, they do seem to be working in their main function which is saving lives and reducing accidents.