the ones for young drivers are slightly different, they monitor driving behaviour and are becoming more popular becuase they offer greater savings over policy's without. a few of my 6th formers have them, and it knows if they are speeding, how much they drive at night, how much they drive etc, and it helps them analysis the insurance for next year. so if they are good its alot less and if they are a liability it goes up. it also mean sif they have an accident the inusrance company have a better idea of whos at fault etc.
give it a few more years and cameras in the front will be alot more common.