I floated an idea similar to this on another site years ago. However mine was just that young drivers should be limited to certain power cars/bikes.
Of course there is many things this doesn't solve.
They can still fly off corners, hit kids that run out the road, etc etc.
However, I do think that a lot of young ones (especially boys, but girls seem to be increasing quickly) drive as fast as they can go.
And how many people test out their car when they get one, see how fast it can go..quite a few methinks
Of course education is always better, but since that doesn't seem to be arriving anytime soon, it always wise to put other measures in which might help reduce accidents.
Various pitfalls:
Would the driver suddenly drive at silly speeds when they get an 'uprated' licence (and thus a faster car).
Would it make some of them drive illegally, i.e. without insurance, tax etc because they want to drive a car they cannot legally use?
Would it be used as an excuse to stop looking into other measures of road safety?
Bonuses:
Could well stop accidents where inexpirenced drivers are going too fast to control it (yes, I know they can in pretty much anything given the right conditions, but if they are limited to xx speed it's less likely to happen than at xxx speed).
Assuming they had proper ID, police would know right away if someone was driving too powerful a car.
*might* bring insurance down for younger people (ha).
I'm sure there is various other pluses and minuses.