private String setVehicleMsg(Vehicle v, String source, String target) {
		String str = "";
		if (v instanceof Car) {
			if (((Car) v).isSmall()) {
				str += "S";
			} else {
				str += "C";
			}
		} else {
			str += "M";
		}
		return "|" + str + ":" + source + ">" + target + "|";
	}