3-Way Junction (T-Intersection) Traffic Light Controller

This project extends the crossroads logic from Project 2 into a three-way T-intersection, with three separate roads taking turns at green instead of just two. Using 9 LEDs and an Arduino Uno, each road gets a full green,yellow,red cycle while the other two stay red, with a mandatory all-red safety pause inserted between every turn to prevent any overlap. It builds directly on the all red safety function introduced in Project 3, showing how the same core safety principle scales cleanly from two directions to three.