The growing power of automation and computers means robots are likely to replace human truck drivers in the United States someday. Two experts say robot truckers are coming but will take years to fully take over. But others point to huge autonomous vehicles operating in mining and successful tests of self-driving cars, and predict it may happen much sooner. As VOA’s Jim Randle reports, 3.5 million humans drive trucks in the United States, and some of their jobs may be at risk.