Many traffic lights around the world use buried loops of wire as Hall effect sensors (for example, to register when a car is waiting to make a left turn). So th

Many traffic lights around the world use buried loops of wire as Hall effect sensors (for example, to register when a car is waiting to make a left turn). So that would pass the sense-think-act test, I'd say, even without considering Smart Traffic Lights[1]. 1: https://en.wikipedia.org/wiki/Smart_traffic_light https://en.wikipedia.org/wiki/Smart_traffic_light