Pedestrian use button placed at traffic lights so that mere citizens are deluded that they actually have some sort of control over the sequence of said traffic signals where in actual fact the system is of 1950s vintage & will change colour every ten minutes regardless.
"Ah! the lights are against me, but what's this? A control button! I'll press this & the little white man will flash & I'll be on my way. Isn't technology great!" Another cruel trick from our heartless government,a placebo button.