http://www.thisislondon.co.uk/news/...nap+motorists+without+them+knowing/article.do
The digital cameras can operate round the clock as they require no film and can photograph the driver's face as well as number plates.
So the first a speeding driver would know about being caught is when a £60 fine popped through their letter box.
Campaigners claim the cameras, which are smaller and less easy to spot than the old-style units, are 'cash cows' that will do little to make roads safer.
Paul Smith, of the Safe Speed road safety campaign, said: "The fact that you do not know you have been flashed adds more uncertainty, which is never a good thing for safety.


