Automobile Data Surveillance and the Future of Black Boxes
schneier.com
schneier.com
While the black boxes help a bit, they don't show the corresponding actions of other cars, state of traffic lights, exactly what lane other vehicles were in, reaction times etc.
Video recording is the final piece of the forensic puzzle. The new cars and driverless cars are going to want it to show they are not at fault, the above average drivers need it for the same reason, so we are only left with a small minority who won't believe video is to their benefit.