private void updateLights() {
		
		switch (_state) {
		case GreenNS_RedEW:
			_ewLight.setColor(LightColor.Green);
			_nsLight.setColor(LightColor.Red);
			break;
		case YellowNS_RedEW:
			_ewLight.setColor(LightColor.Yellow);
			_nsLight.setColor(LightColor.Red);
			break;
		case RedNS_GreenEW:
			_ewLight.setColor(LightColor.Red);
			_nsLight.setColor(LightColor.Green);
			break;
		case RedNS_YellowEW:
			_ewLight.setColor(LightColor.Yellow);
			_nsLight.setColor(LightColor.Green);
			break;			
			default:
				
				break;
		}
		
	}