From David Mitchell in the Observer (edited):
[L]et's celebrate speeding fines by calling them a tax. It would remove the criminalising stigma to which criminal motorists object so much, and either boost revenues or improve highway code adherence – either way, we can't lose. The country is gasping for cash and getting it from those careless enough to break speeding laws seems at least as fair as hiking income tax for high earners. Economists worry about taxes reducing people's incentive to earn. Well, let's reduce their incentive to drive fast instead. Just think of the huge effort and inconvenience people are prepared to endure to avoid tax – creating offshore companies, living on homophobic islands, even giving to charity. Under this system, they'd just have to slow down in built-up areas.
Within the madness there is a great deal of truth.