I wasn't condoning someone parking on the yellow zigzags but rather understanding why someone might actually do what they could in order to get their child to school on time avoiding slippery pavements. I got stuck up there last year with a buggy and child finding that I could not get up the hill without an accident and getting back down again or across the road was impossible. If most of the kids had already gone in and it was morning rather than afternoon then the risks of parking on the zig zags doing so were probably minimal in practice.