How to Build a Traffic light System in Vanilla JavaScript

In this video, I’ll show you how to create a working traffic light system using pure JavaScript. We’ll simulate how real traffic lights work—cycling through red, yellow, and green—with smooth timing and logic control.

🧠 What You’ll Learn: How to use setInterval() for timed light changes DOM manipulation to change colors dynamically Structuring a simple state machine in JavaScript

💻 No libraries, no frameworks – just clean Vanilla JavaScript!

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🌍 Source code: https://keepsnip.com/source/javascript-traffic-light-system