While doing this, somone pulls over onto the other side of the road, nips out their Jaguar 880JOM and uses the zebra crossing to cross over. Well, if you do want to cross a road, parking by a zebra crossing is the closest place to stop.
It would be an interesting dataset: the number of vehicles that stop on the crossing lines here. Assuming it's for short stay cars only, you could run a lot of short stays through in a day. Which could actually put pedestrians more at risk than if the crossing wasn't there.