Drivers may soon be forced to stick to speed limits by satellite technology that automatically slows down speeding cars, The Mail on Sunday can reveal.Radical road safety reforms being considered by the European Commission would require every new vehicle to be fitted with a device that limits engine power for anyone driving too fast.The gizmos use orbiting satellites to pinpoint a car’s position, and intervene if it enters an area with a lower speed limit – such as a controversial 20mph zone – to slow it down.Road safety campaigners say the move will safe hundreds of lives – but critics branded it ‘absurd’ and questioned just how reliable the technology will be.If adopted, the proposals would be the most seismic motoring reforms since it became compulsory to wear front seatbelts 43 years ago. The move could eliminate speeding fines and cost the Treasury an estimaed £130 million a year.While Europe’s proposal to make such devices mandatory from 2030 would not extend to Britain because of Brexit, experts say almost all manufacturers would still install the technology in models sold here because it would be too expensive to make exceptions for UK vehicles. And that would make it easier for the UK to intoduce its own legislation later.The MoS can also reveal that 5,000 of London’s 8,000 buses have already been fitted with speed limiters, with the whole fleet set to be covered by 2031.The technology will familiar to anyone who has rented an e-bike from Lime or a similar company, as they have an onboard GPS system that automatically limits speed in areas such as parks and pedestrianised zones – with an icon of a tortoise displayed to the rider to indicate the restriction.