Originally Posted by John Carter

Make the driving test much harder. Simple as that.

And make everyone retake it every 10 years.

Also, introduce a Swiss-style system where people can only go for their test a set number of times (the Swiss system, IIRC, allows for three tests. If failed, you have to go see a specialist who will assess you suitability for driving and has the power to let you try one last time. If you fail that you don't drive.)

This would reduce the amount of cars on the road, but more to the point it would also reduce the number of unsafe drivers on the road, meaning less accidents. Two birds with one stone.