private Vehicle parseLine(String line) throws InvalidFormatException {
		String[] parts = line.split("\t");

		if (parts.length != 5 || parts.length != 7) {
			throw new IllegalArgumentException("Wrong number of components");
		}

		String type = parts[0];
		if ("car".equals(type)) {
			return newCar(parts);
		} else if ("motorbike".equals(type)) {
			return newMotorbike(parts);
		} else if ("truck".equals(type)) {
			return newTruck(parts);
		}
		throw new InvalidFormatException ("Unknown type of vehicle");
	}