public Drivability isDriveable(Vehicle c) {
		if (c.getOrientation()== _lightControl.getState().getAllowedOrientation()) {
			if (_lightControl.getState().isYellow()) {
				return Drivability.Caution;
			}
			return Drivability.Driveable;
		} else {
			return Drivability.NotDriveable;
		}
	}