20mph maybe lower ?
Seriously?

20 yes, im all for that, especially during term times, but lower... It would be far safer to close the road completely.

Im honestly not sure people know what a real 20mph looks like.

Personally I would start making school zones safer by not allowing parents to ignore the zig zags, double park, park on corners, or other selfish behaviour.
Take the school run cars off the road, and suddenly there is a lot less traffic, a lot less rushing about, and the roads feel safer.

Summer holidays at the moment.... do you see much queuing traffic at the moment.

The school run mentality needs to end. Children should be going to local school or using public transport to get to them. OR a decent school bus system needs to be put in place.