When the driver approaches such a sign the brakes are applied gently if the car is going too fast. The system then allows the car to speed up once it is out of the restricted area. To prevent the vehicle from accelerating above a speed limit, the ignition timing is altered and two of the fuel injectors can be disengaged. Funding is coming from the Department of the Environment, Transport and the Regions, which admits development is in the very early stages, but has huge potential.
A spokesman said: 'A good percentage of motorists don't massively exceed the speed limit and would not be too opposed to the adoption of this technology. It would also present the opportunity to companies to manage risk more effectively and enhance their public image by taking a responsible attitude to speed.'