Waze's icons aren't as self-explanatory as the ones on Google Maps, but once you know what they're indicating, the app ...

Every car speeding by and person crossing the street is living out their own story, traveling in their own direction, under the same three-light system. We encounter traffic lights nearly every day, ...

Red and green traffic lights have been around since the 1800s, when British traffic officers used to rotate gas lamps that burned red and green to control the movement of mostly horse-drawn vehicles.