These self-driving, robo-valets look like large, rectangular boxes, about the width of a small SUV. They essentially act as a forklift, sliding metal arms underneath your car to lift it by the tires. Stanley Robotics told The Verge the system is much more efficient at parking than humans are -- though that's not exactly a high bar. The robot valets can fit 50 percent more cars in the same area, by parking them closer together and a few cars deep.

For now, Stanley Robotics will cover 500 parking spaces, but the company told The Verge it eventually wants to service 6,000 spots. There's no word yet if the company will launch this at other airports, but it has held trial runs at Düsseldorf International Airport in Germany and Charles De Gaulle Airport in Paris. Another test is planned for London's Gatwick airport later this year.