It happens that dennis@home formulated :
In the picture a transit van has reversed into a wall and knocked it off the
deck of the car park.

The question is does the wall have to stop a transit van going through it or
not?
The car park shows no signs of falling down.

It looks to me as if there is a cantelevered section of floor, beyond
the main floor, with a wall on the far edge of the cantelevered
section. It seems the cantelevered section has collapsed under the
extra weight of the van, taking the wall along with it.