In my home town in Germany (and probably other cities as well, only I've realised I've never really paid attention to that subject while visiting other cities),

In my home town in Germany (and probably other cities as well, only I've realised I've never really paid attention to that subject while visiting other cities), the little tactile arrow marking the crosswalk direction plus a tactile buzzer for blind people is mounted together with those buttons, so even when a certain direction and its parallel crosswalk always get green by default (and therefore there's no need ever to push a button), a button housing still gets installed for the buzzer and arrow. The only difference is that those kind of non-buttons are painted a different colour, plus with the older style of buttons that you physically have to push in order to operate a switch, on those non-buttons the push-plate is fixed in place and cannot actually be pushed. (Some people occasionally still try to.) With the newer style of button that operates via some sort of electronic touch sensor and therefore has no moveable parts to begin with, the only distinction might be the colour? (Not sure, because the intersection I regularly pass by on the way to work still uses the old-style buttons…)