Why do only some pedestrian crossings make sounds or play music?

I discovered recently that some only do it when you push the button for blind people by mistake, but I don’t think that covers all of them. Any theories?


Why does my gym have no smoking signs in the poolside showers?

I really do mean in the showers, not just in the shower room! It’s under a hotel, so the only thing I can imagine is that once in the halcyon smoking days of the 80s hotel guests would sit around the pool on loungers (even though it is indoor, but I saw someone doing that in the Iidabashi Konami Sports today) having a puff. That is strictly my imagination, though. Any better theories?