Indeed enforcement of lack of it is the problem.

Where I live on a fairly busy narrow one way street, there is a shop with a set back door and at one time the shop owner would park his van on the pavement hard up against the shop front but the set back door would allow him to get out of the van.

Pedestrians however would have to go into the road to get passed and although complained about, there seemed nothing official that could be done about it, or nothing they were willing to do.