The car that calls for help
Called Neo-Trac and sold by Unipart, the system's controls are contained in a black box that is fitted to a car. It pinpoints the exact location of the car using satellite tracking and computerised mapping.
In a crash, it works by using a motion sensor that detects abrupt changes in speed or direction.
If it senses the car has crashed, it immediately sends a message to a tracking centre, where an operator will then alert the police station nearest to the crashed car.
The system can also be used to track a stolen car and disable the car's engine.
There's also an automatic signal booster than operates when the satellite signal is weak, such as in remote areas or in underground car parks.
The Neo-Trac is available from £615 as well as a £185 annual administration fee.
The EU is currently investigating ways of making similar systems mandatory in new cars, although these are not likely to be available until at least 2010.