On-board video cameras or dashcams (caméras embarquées pour voitures) are increasingly popular. You see them a lot in England. YouTube is awash with lurid footage taken by them in Russia, a country where it's probably wise to use them. They are not often seen in France, but this may change. After all, when did you last visit a car accessory shop that didn't sell dashcams?
To encourage this trend, Prevencia now offers a generous 10% discount on car insurance premiums where the car insured has a dashcam fitted, working and in use.