You can buy Traffic Lights System for Unity from the Asset Store
Traffic Lights System
Traffic Lights System SE is Unity package to create simulations of traffic lights in games and other 3D projects made with Unity.
The simulation is divided into user defined phases. Each phase groups traffic light modules which should be switched on at the same time. Also it defines proper timings for lights.
The manager has two modes (two programs):
- Main – which is normal operation
- Malfunction – failure (all light modules from all phases have yellow light blinking).