Autonomous last mile delivery market is accelerating, propelled by cheaper sensors, supportive regulations, e-commerce and strategic alliances, creat ...

"Retention is a big issue, a big concern, so I do expect we'll be doing a lot more work on this in the future," said USPS' Rick Poland.

As the trucking industry struggles to recruit drivers, driverless trucks won’t need sleep, won’t speed and won’t get road rage. But experts and truck drivers say they are not a panacea.