Ever heard of the insurance company Progressive? They have a product called "snap shot". It plugs into your car and it does the following: Trip start date and time Duration Distance Max speed Time in different speed bands Number of hard braking events Number of extreme braking events (sometimes classified as accidents) Number of hard acceleration events Time spent at idle Snapshots of speed at defined intervals
Progressive calls this policy a Pay As You Drive program a form of a usage-based insurance. They state that to get the greatest discount a driver needs to brake gently, drive less than the average driver, and minimize driving during rush hours and the time between midnight and 4:00 A.M.