Taxis and buses face automatic speed limiting

"Thousands of taxis, buses and council vehicles could be fitted with devices that prevent them from exceeding the speed limit."

"The technology — known as Intelligent Speed Adaptation (ISA) — is being tested by Transport for London in a trial starting this summer on all roads inside the M25."

"Drivers of vehicles with ISA will be able to select an option that prevents them from accelerating over the limit. The vehicle will also automatically slow down if the driver fails to reduce his speed when he passes a sign marking a lower limit."

"The device uses satellite tracking and a digital road map to detect the local speed limit."