Also you are only allowed to drive as fast as to not endanger others. Children are not reliable and predictable. In front of a school during school hours driving at the speed limit is still reckless.
Parents need a way to drop off and pick up their kids, especially if it is a time other than school hours- the kid is sick, has a doctor’s appointment, etc.
Not in most of europe, where kids can usually go to school by themselves, either by walking, biking or public transport. It’s all about city planning.
Helicopter parents driving their children to and from school are a big nuisance and safety concern here.