You can check out how the system works in the video below. The idea is that a regular semi will pick up a delivery load from a shipper and drive it to a transfer hub. There, one of Uber's self-driving trucks, and a safety driver, will take the trailer and transport it over the longest leg of the trip. Once the truck nears the delivery destination, it will again head to a transfer hub where a conventional truck and driver will pick up the trailer and take it to its final stopping point. Shipment details are handled by Uber Freight -- the app the company launched last May that connects shippers and truck drivers.

Uber made its first delivery with a self-driving truck in 2016, when one of its semis transported 2,000 cases of Budweiser from Fort Collins, Colorado to Colorado Springs. Since then, Embark has joined the self-driving semi shipment game, delivering Frigidaire appliances between Texas and California in 2017 and making a long-haul trip from California to Florida earlier this year.

Uber's self-driving trucks are a result of the company's acquisition of Otto in 2016, a deal that eventually led to a major legal dispute with Waymo. Uber and Waymo agreed to a settlement last month and are reportedly now considering a partnership.