Shadow police reform minister David Ruffley has said speeding fines are 'a nice little earner' for the Labour government.
His comments came after the Tories revealed that a million more speeding tickets are being issued every year compared with a decade ago, raising £100 million a year in fines.
Official figures showed 1,773,412 fixed penalty notices were given to drivers in 2006, up from 712,753 in 1997.
Mr Ruffley called on ministers to tell the public what they are doing with cash taken from motorists.
He said: "Ministers' failure to answer that question confirms the view that for this government the British motorist is 'a nice little earner'.
"The Government needs to rethink ways of improving road safety, including cracking down on uninsured drivers," he added.
A spokesman for the Department for Transport said: "Safety cameras are there to save lives, not make money.
"Independent research has shown there are 1,745 fewer deaths and serious injuries at camera sites each year.
"The Government is clear that the best safety camera is the one which takes no fines at all, but succeeds in deterring drivers from speeding."
Revenue from cameras had begun to decline, he pointed out.
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