Facts!! Well here are some inconvenient ones to chew on.

Based on it's first survey of the causes of accidents (in 2005), the Department of Transport (DfT) has revealed that exceeding the speed limit is a factor in only 2% of injury crashes involving drivers over the age of 25. For younger drivers, aged 17-25, it is 6%, and for the youngest, aged 17-19, it is 8%.
Travelling too fast for the conditions, rather than exceeding the legal speed limit, is a factor in five, 11 and 14% of crashes respectively.
These are the government's own figures supplied by the DfT to a parliamentary,transport sub-committee.
In September 2006 the DfT revealed that only 5% of accidents involve a vehicle exceeding the speed limit.
Mr 'Reasonable' Mombiot in an article in the Guardian (where else?) last Tuesday, wrote that all critics of official policies, including road safety experts, and serving police officers, are nothing more than "swaggering petrolheads".
Yes he sounds like a balanced and reasonable person doesn't he?
However like smoking, I don't suppose that knowing the facts will change some people's minds.
Giok