[arp242]

I've walked over wet concrete. It wasn't really signed very clearly (there were some cones on the corners, but that doesn't automatically mean "wet concrete"), it's really not that obvious unless you're looking for it, and I was late and in a hurry.

Looking at those pictures, I think loads of people could have made that mistake for quite a few of them, as it often doesn't seem indicated very clearly, and in some situations going through the wet concrete was the only way the car could go from a parked position.