How Do Traffic Lights Know When to Change?

Ever wondered how traffic lights seem to know exactly when to change? It’s not just a simple timer. Modern traffic systems use hidden sensors, real-time data, and intelligent control algorithms to detect vehicles, measure wait times, and balance traffic flow across multiple directions. From inductive loops under the road to coordinated “green waves” across entire cities, this video breaks down how traffic lights actually work—and why they sometimes make you wait even when the road looks empty. #TrafficLights #HowItWorks #Engineering