Sorry, I will not change my mind, most collisions are not related to speed, but drivers not paying attention. Speed can be measured and taxed!
"Driver error and inattention is the most common contributory factor in UK road accidents, according to new statistics from the Department for Transport, while speed-related causes contribute to just 14 per cent of all prangs.
The DfT stats attribute 68 per cent of all road accidents to a failure to look, while in the majority (32 per cent) of fatal accidents loss of control is reported as the contributory factor.
Exceeding the speed limit is a contributory factor in five per cent of all accidents; driving too fast for conditions accounts for nine per cent. This makes exceeding the speed limit the sixth most common contributory factor.
Overall, the number of accidents in 2008 fell seven per cent from 2007, to 230,905. The number of people killed in accidents fell by 14 per cent, to 2538.
When asked if it was time to reduce the emphasis on speeding and concentrate on improving driver awareness, a DfT spokesperson said, “To help the police tackle bad driving we have proposed making careless driving a fixed-penalty offence and have also recently announced wide-ranging changes to driver testing and training, to better prepare learner drivers for the road.”
http://www.autocar.co.uk/car-news/motoring/errors-cause-most-uk-accidents