But it does cause it because every car needs to get checked off. When I was a kid in the 80s, there were still quite a few kids that got picked up, but no one was picking them up from the door. They'd park somewhere around the school within a block or two.
I dunno... I grew up in the 80s/90s and most of us took the bus or walked if we lived within a mile or so. A parent drop-off/pick-up was the exception - going to a doctor appointment after school or something.
My school said you must be at least 2 miles away before they would route buses for pickups. There were exceptions which my neighborhood qualified as there were no sidewalks, and we would have to cross a single lane bridge to cross a 50 foot creek with no pedestrian path. I lived in the boonies, and it was faster for me to cut through cow pastures in a straight line than walking the roads. We just had to make sure the rancher's bull was not going to notice us (or sneakily hang a red handkerchief on one of your buddies' backpack).