I mean, my first thought was "i wonder if you could drive across that." But I'm also smart enough to not be the first person to try... maybe the second though
Today, someone jumped over the construction barriers on an escalator that was under construction. They fell into the open hole in the escalator, got seriously hurt, and then had the audacity to complain to metro police officers that there was a hole in the escalator for some reason. The police had the grace to not admonish him for being a moron. Both ends were blocked with construction barriers ~4.5 feet high by 3.5 feet deep, and the elevator was right by them, lol. It was very difficult for someone to even vault over in the first place.
I visited Iceland, not too long ago. The tour guides, politely, made a point of illustrating how much of a rude menace tourists can be with their rental cars. We got a pass, of course, as we were on a tour bus every time this happened. The message was clear: use the world-class public transit and charter busses/tours where possible.
My perspective as a tourist: the cops really are needed in situations like this.