Simulate traffic light system

Main.cs

using System;

namespace TrafficLights
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var trafficLightController = TrafficLightController.getInstance();
            Console.WriteLine("Press Ctrl C to stop");
            trafficLightController.Start();
            bool done = false;
            while(!done) {
                // Let the controller do it's thing
            }
        }
    }
}

TrafficLight.cs

using System;

namespace TrafficLights {
	
	public enum TRAFFIC_LIGHT_STATE {
		RED,
		GREEN,
		ORANGE
	};
	
	public class TrafficLight {
		public TrafficLight(TRAFFIC_LIGHT_STATE state, string name) {
			this.State = state;
			this.Name = name;
		}
		
		public TRAFFIC_LIGHT_STATE State { get; private set; }
		
		public string Name { get; private set; }
		
		public void Update(TRAFFIC_LIGHT_STATE newState) {
			this.State = newState;
		}
		
		public void Display() {
			switch(State) {
				case TRAFFIC_LIGHT_STATE.RED:
					Console.WriteLine("{0}:RED", Name);
				break;
				
				case TRAFFIC_LIGHT_STATE.GREEN:
					Console.WriteLine("{0}:GREEN", Name);
				break;
				
				case TRAFFIC_LIGHT_STATE.ORANGE:
					Console.WriteLine("{0}:ORANGE", Name);
				break;
			}
		}
			
	}
	
}

TrafficLightController.cs

using System;
using System.Timers;
using System.Collections.Generic;

namespace TrafficLights {
	
	public class TrafficLightController {
		
		const int TIMER_TICK_IN_SECONDS = 1000;
		const int SWITCH_TO_GREEN_IN_SECONDS = 5;
		const int SWITCH_TO_ORANGE_IN_SECONDS = 8;
		const int SWITCH_TO_RED_IN_SECONDS = 10;
		
		TrafficLightController() {
			counter = 0;
			timer = new Timer(TIMER_TICK_IN_SECONDS);
			timer.Elapsed += onOneSecondElapsed;
			trafficLights = new List<TrafficLight>();
			trafficLights.Add(new TrafficLight(TRAFFIC_LIGHT_STATE.RED, "Traffic Light 1"));
			trafficLights.Add(new TrafficLight(TRAFFIC_LIGHT_STATE.RED, "Traffic Light 2"));
		}
		
		static public TrafficLightController getInstance() {
			if (instance == null) {
				instance = new TrafficLightController();
			}
			
			return instance;
		}
		
		public void Start() {
			timer.Enabled = true;
		}
		
		public void Stop() {
			timer.Enabled = false;
		}
		
		static void onOneSecondElapsed(Object source, ElapsedEventArgs e) {
			displayLights();
			
			counter++;
			if (counter == SWITCH_TO_GREEN_IN_SECONDS) {
				switchLights(TRAFFIC_LIGHT_STATE.GREEN);
			} else if (counter == SWITCH_TO_ORANGE_IN_SECONDS) {
				switchLights(TRAFFIC_LIGHT_STATE.ORANGE);
			} else if (counter == SWITCH_TO_RED_IN_SECONDS) {
				switchLights(TRAFFIC_LIGHT_STATE.RED);
				counter = 0;
			}
		}
		
		static void displayLights() {
			foreach(var light in trafficLights) {
				light.Display();
			}
		}
		
		static void switchLights(TRAFFIC_LIGHT_STATE newState) {
			foreach(var light in trafficLights) {
				light.Update(newState);
			}
		}
		
		static TrafficLightController instance; 
		
		static Timer timer;
		
		static int counter;
		
		static List<TrafficLight> trafficLights;
	}
	
}