Also see a lack of banning motorcycles. Tho, I probably think this because small 100cc bikes are super common in my country and the bad habit of them to get in sidewalks.
Motor vehicles are already banned from the sidewalk by traffic rules. There is no sign here saying "No murder" either, doesn't mean it's allowed. My city also specifically bans bicycles off the sidewalk too, but since a bicycle is defined in the code as having at least two wheels, unicycles are NOT included. This is settled court precedent here after some clown challenged the ticket he got for riding one and won. Rollerblading and skateboarding is fine.
Unless this city has specific laws banning bicycles/rollerblading/skateboarding, this sign has no legal power except as an advisory by the property owner. Ironically, violating this sign will be judged as tresspassing, not a traffic infraction. You are on the property at the invitation of the owner under presumption of following their rules. No follow = no invitation = tresspassing :(
No, I am from Venezuela. It isn't that level of common, but sometimes you see a biker decide the bottleneck is too much to go between and change to the sidewalk. There is also a few places where it is supposed to be people walking only but some will just get in there for no reason.
The worst offenders of this are the cops and military, because they usually aren't on small displacement bikes but massive 1000cc Vstrom and KLRs.
That guy on the unicycle, folks, let me tell you, he knows what he's doing, okay? Believe me, he knows that even though the sign doesn't say he can't, he still isn't allowed to do that. Tremendous knowledge, tremendous. But you know what? He's just getting off on a technicality, folks, instead of actually following the rules. Sad! Maybe he should be a lawyer, because that's what they do, they find those loopholes. Nobody knows loopholes better than me, folks. Believe me