Its nothing more than a way to raise more money. If it was about road safety, then money would be spent putting patrol cars on the road and in the most high risk areas. The way the school runners drive, especially around infant and junior schools is far more dangerous than someone doing 101mph on an empty motorway.
I know, as a motorcyclist, if I die on the bike, it will most likely be by a car turning right across my path/crossing my path pulling out of a junction. This is nothing to do with speed and more to do with rubbish driving standards. On my 5 mile commute, the most dangerous part is the final 300 yds