The OnStar system, being run in partnership with the AA, can pinpoint a vehicle's location to within 30 yards. Trials with Vauxhall begin this spring and the system is due to be launched in November, initially on the Vectra range. The system will enable drivers to reach the information centre - operated by the AA - by pressing a single button on a car phone. Staff at the centre can then send emergency help, provide traffic or route information or talk a driver to an unfamiliar destination. It will also operate on the continent, with instructions in English available for British motorists driving on the continent.

The cost is yet to be finalised, but is likely to be in the region of £500 to £600 excluding installation. However, the AA points out that up to a fifth of driving time on unfamiliar roads is spent getting lost and 350,000 tonnes of fuel are wasted by driving round in circles.