I drove past a school just after 9am. Roadworks with temporary traffic lights. Right by the yellow zigzag lines, were parents sitting in their cars. Drove back on the road at 2pm and the same parents were sitting in the cars. Don't say they sat in their cars for the 5 hours? If that's the case, where do they go for a wee?
Also another thing which happens at other schools around here. Parents park up in a similar position - right by the yellow zigzags. Then someone picks them up, leaving their car there during school hours. Somehow, the parents get back to the cars when schools finish. So they and their lazy kids don't have far to walk. There are no cars parked like this during weekends and school holidays. Think should be a parking limit in place in both situations