It's really a responsibility/competency issue, not an age issue, so changing the driving age to 18 won't "fix" anything. Only parents can judge if their child is responsible and competent enough to be trusted with a car. And since you have to co-sign for a driver's license for anyone under 18, the parents can determine if and when their child gets a license prior 18.
The "black box" IS really cool! Just read an article about it this past week. It has a flash memory card in it that records driving data, and you just plug the card into the home computer. It also gives an audio warning when the driver exceeds a certain speed or drives erratically. I think it costs around $299.
Yeah, it does sound like Big Brother, but knowing MY child, it would be a useful deterent just knowing that I could "check out" her driving "record" at any time!