A lot of pupils in America are driven to school these days.
The Atlantic has a very brief navel-gazing article
about it here, but the pertinent quote is below:
I believe one major factor between the British and American experiences comes down to infrastructure. Outside of dense urban areas, your typical American school is going to be built on large plots with room to build parental drop-off zones - like
this school in Florida, which also has a large staging are for school buses.
Meanwhile, your average British school is going to be on a fairly small plot of land on very low density streets with barely enough room for a staff car park let alone a drop-off area. Throw in a complete lack of any enforcement of traffic laws and it's no wonder the school rush is such a nightmare in Britain with all that traffic.