Originally Posted by
Pantz
I think those buttons here are a way to determine priority. The light might switch even if you don't push the button, but less priority is given to your crossing. They do have sensors under the roads near most intersections to determine the priority for the car lanes, but those sensors obviously don't work for pedestrians so they have the buttons instead. To be honest I thought this was standard behaviour, but reading up on it some big cities (NYC being the only confirmed example I can find) seem to have some placebo buttons.
Clever intersection programming is pretty integral to well functioning traffic (and saves everyone both time and gas), so I'm surprised if so many of you guys' cities have fully automated pedestrian crossings! Of course, it makes more sense in a super dense place like NYC where there are always pedestrians waiting to cross.