Why Do We Press Pedestrian Crossing Buttons?

Have you ever stood at a pedestrian crossing, pressed the button, waited patiently… and then pressed it again, just in case? And why is it that someone always walks up behind you and presses the exact same button? Apparently, you weren't doing it properly. But here's the real question: Do pedestrian crossing buttons actually do anything? In this episode of Wait… Why Do We Do That?, Steve investigates one of life's most frustrating little mysteries. Are those buttons genuinely controlling the ...