Who does that prevent kids either walking to school themselves
Depends on the kids. Averse though I am to cotton-woolling them, I don’t think many people would be happy to send five or six year olds to school unaccompanied.
or being dropped off near the school (within say 500m) but not directly outside the gates?
Nothing (although it doesn’t solve anything, 500m is still well within the blast radius at our local one…).
I didn’t realise it’d be necessary to exhaustively list every parameter that might conceivably make driving a child close to school of a morning to be justified 🙂 However, you’re making the same point I am, which is that such circumstances are somewhat rare.
(Our walk to school goes past houses from which people drive…)