Certainly, in many cases each unit has a reserved spot or two but who can see the numbers when the snow is this prolific? While the person in the photo used what appears to be a lovely little café table as placeholder, folding chairs are often the preferred method for marking a claim.
The problem is that the visitor spaces are always the last spaces to get cleared.
As I drove about this afternoon I also noticed that all homeowners associations are not equally up to the task. I saw townhome communities that were cleared and others that looked like they hadn’t seen a plow since Saturday.