A device which stops cars speeding is being tested by British drivers, according to reports.

The Sun newspaper, which tried the device, said the Intelligent Speed Adaptation system applies the brakes if motorists go too fast — and will not allow them to accelerate.

It is hoped that ISA could save lives, prevent many drivers from losing their licences — and even see the end of speed cameras and road humps if most cars were fitted out, the report said.

The system, which reportedly costs around £200, uses onboard computers and satellite positioning to identify the speed limit of every road a car is using.

If a driver tries to exceed it, the accelerator pedal vibrates, there are a series of bleeps and the pedal resists any attempt to accelerate – road speed limits are flashed up on the dashboard, the Sun said, adding that 20 motorists in Leeds are testing the system for six months using Skoda Fabias, in a government-approved trial organised by the city’s university.

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The paper said the cars were adapted by the MIRA Research Centre in Nuneaton, Warwickshire, and the system can be switched off once installed — and may eventually be offered to buyers as an optional extra.

According to the Sun, however, the Association of British Drivers claimed ISA will make roads more dangerous. Chairman Brian Gregory reportedly said: “This is a lunatic idea. Driving discipline would deteriorate as people allowed the satellite to control them. Overtaking would become impossible. And drivers would have no control in an emergency situation.”

A government transport spokesman reportedly denied that the system may become mandatory on all cars – he said: “Motorists can choose if they want the system — it won’t be forced on anybody. It could save them losing their licences and it could save lives.”

An ISA trial in Sweden involving 10,000 drivers ended with 75% wanting to keep it in their vehicles, the Sun added.

The paper’s motoring editor tried the device and said it prevented him from receiving two speed camera fines, quickly slowing the car to the legal limit for the areas in question.