Yes, true, until you reach a situation where the vast precentage of the population has been caught speeding.
Just because people haven't been caught speeding doesn't mean they don't speed. Put more camera's up, lower the speed limit on rural roads, set up more average speed sections, change the speed limit up and down on the same road and watch the number of convictions rise further.
'Recently released figures reveal that in 2004 there were 13.5 million motoring offenses - that's about 1 for every 2 cars in the country. Of these there were 11 million fixed penalty notices which includes just over 2 million issued from speed cameras.
The increase in speed camera tickets is 6% higher than in 2003 and double that from 2001 raking in £130 million in fines during 2004.
These numbers are likely to increase as 233 new camera sites have been approved for 2006-2007'
'A total of 1,462,235 speeding fines were handed out to drivers in England and Wales in 2007 - the most recent data available.
At £60 each, that raised some £87,734,100 for Government coffers - the equivalent of £240,367 a day'