well, in areas with these barriers installed there are certainly traffic signs about the restriction.
... which lots of folks (as usually) consider made for 'the others' but not themselves
the black car in the middle of the damage series is an excellent example:
it's much too fast for the situation and the driver ignores people who are about to cross the street on something that looks like a priviledged passway.
the 2nd vans follows too close: there is a simple rule in traffic, that says you have to adjust your speed in such a way that you can stop the vehicle within half the distance you can overview.
just because it is unexpected, doesn't mean something does not happen...
but in any case, you can safely bet that the area is labelled properly
