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Definition: self-driving rig

A semi-trailer truck (tractor trailer) that is driverless from the start of the trip to the end. On the highway, the self-driving rig is autonomous; however, when it travels on city and side roads, it is driven from a central station by remote drivers with computer screens. Self-driving rigs are expected to become mainstream by 2020 and thereafter. How many of the nearly 1.7 million truck drivers in the U.S. will be retrained as drivers at a computer terminal remains to be seen. See self-driving car.