In Hannover, this is the way for nearly all traffic lights. There are 2 types of switches:
The infamous “beg button” for requesting green, plus there’s often a switch at the bottom that activates a vibration, or makes the switch rotate.
This one has an arrow-shaped button at the bottom to request a beeping sound, plus the arrow also rotates when it was pressed.
The point is, though, depending on the city, state, or country, the default functionality of a traffic light’s button varies. Just tagging “there’s a button” is about as correct as useless without further specifying, what’s supposed to happen when you press it - at least on traffic lights.
I mean … we should probably keep that button_operated=yes simply means that there’s a button, but that information needs refining. And I’m happy @Langlaeufer is kicking off the discussion what and how to tag.