From Boing Boing, a proposal to equip New York Taxis with black boxes, as fitted to aircraft and trains.
If I ruled the world, I’d have these things fitted to all motor vehicles. I know there are privacy issues involved here, so they’d only have to divulge their contents to the police if the vehicle is involved in accident in which someone is killed or seriously injured. But if you were doing 50 in a 30mph limit when you knocked over that cyclist….