Most school zones in the US are 20mph (32km/h). Some states will have 25mph and, for example, a highway going through a school zone that usually 65mph may go to 35-50mph when the school zone is active but this is an exception, not the rule and is done on a case by case basis.
Remember though, American roads are much larger tha European roads. Most of these school zones that go that slow there’s really no need for it.
Most school zones in the US are 20mph (32km/h). Some states will have 25mph and, for example, a highway going through a school zone that usually 65mph may go to 35-50mph when the school zone is active but this is an exception, not the rule and is done on a case by case basis.
Remember though, American roads are much larger tha European roads. Most of these school zones that go that slow there’s really no need for it.
What. Aren’t those supposed to be grade-separated and have no pedestrians.