From BBC News:
'Black box' insurance for motorists
"Motorists who use their car infrequently, or only make 'safe' journeys, may soon be able to get cheaper car insurance under new system being considered by one UK insurer.
New technology is being piloted which allows the insurance company to keep track of a driver's car use, including the distance travelled, and the weather conditions.
Premiums would then be altered to reflect people's driving habits.
Customers would have a 'black box' device fitted in their car, which would transmit their journey details back to the insurance company."