Self-Driving Trucks Could Be on Highways in 3 to 4 Years

“A lot of the technology is driver assist or safety enhancement, said Max Fuller, executive chairman of U.S. Xpress, Inc., the fourth largest trucking company in the U.S.  “If you look at [autonomous vehicles], it will come in pieces.”
He anticipates Level 4 autonomous capability in three to four years. The National Highway Traffic Safety Administration defines a Level 4 autonomous vehicle as one that can drive itself in most situations, with some exceptions, such as weather or construction, where a human may need to take control.