A sophisticated in-car computer could soon make it impossible for motorists to speed.
The system detects the speed limit and automatically slows the car if it is being driven too quickly.
It pinpoints a vehicle’s exact location via satellite and accesses a database of every road’s speed limit to determine how fast the vehicle should be travelling.
The Intelligent Speed Adaption system will be unveiled today as part of the largest-ever pilot of its kind.
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It is seen as a blueprint for a nationwide scheme which could add around £500 to the cost of a car.
But critics last night claimed that it was further evidence of state interference.
They say it undermines motorists’ freedom and claim it could hinder, rather than aid, road safety.
The trial is being carried out by Transport for London (TfL) which runs buses, trains, the Underground and major roads in the capital.