[jefftk]

> Most US states cap speed limits around schools at 15mph when children are present.

Are you sure? The ones I've seen have usually been 20 or 25mph.

Looking on Image Search (https://www.google.com/search?q=school+zone+speed+limit+sign) and limiting just to the ones that are photos of real signs by the side of the road, the first 10 are: 25, 30, 25, 20, 35, 15, 20, 55, 20, 20. So only one of these was 15.

[enlightens]

Here's a random elementary school in Santa Monica with a 15mph sign https://www.google.com/maps/place/McKinley+Elementary+School...