Cameras that monitor motorists' average speed could replace traditional fixed-point speed traps in a move announced by transport secretary Geoff Hoon.
Mr Hoon told The Sunday Times in an interview that fixed or "spot" cameras, which measure speed at only one point, are seen as "arbitrary" and "unfair".
He claimed that the new high-tech average-speed cameras were fairer to drivers, encouraged safer driving and reduced fuel consumption.
"Spot speed cameras are seen by some people as unfair because when you are driving along you perhaps don't notice your speed," Mr Hoon said.
"What is interesting about average-speed cameras is that (limits) are largely observed by motorists."
He added: "There is an area between my home and my constituency where they are widening the M1 and there are average-speed cameras.
"It reduces fuel consumption. By encouraging that smoother flow of traffic you are getting greater reliability."
The MP for Ashfield also confessed to having been caught speeding himself after doing 42mph on a country road with a 30mph limit. He said he still had a "sense of resentment" after the council raised the maximum speed limit on that road to 40mph a few months later.
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