IT IS the ultimate back seat driver. Motorists face having their cars fitted with a “spy” device that stops speeding.

The satellite-based system will monitor the speed limit and apply the brakes or cut out the accelerator if the driver tries to exceed it. A government-funded trial has concluded that the scheme promotes safer driving.

Drivers in London could be among the first to have the “speed spy” devices fitted. They would be offered a discount on the congestion charge if they use the system.

The DfT says it has no plans to make speed limiters mandatory but admits that it is considering creating a digital map of all Britain’s roads which would pave the way for a national ISA system.

“no plans to make speed limiters mandatory” – Yeah, right.