Jah P has sent in a link to one of his photos: the school run outside Sefton Park School.
The sign says that "Parking near the school entrance is dangerous and selfish". This is why one of the parents is clearly unloading in the middle of the road. It leaves the pavements clear, stops cars speeding past the school and acts as a form of traffic calming that encourages cycle dropoffs.
(for more details, see the Ashley Grange Residents Organisation)