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Companies offering driver-assistance systems and developing autonomous vehicles are entering a new phase of more exacting oversight.

DETROIT — The U.S. government’s highway safety agency has opened another investigation of automated driving systems, this time into crashes involving Waymo’s self-driving vehicles.

General Motors’ troubled Cruise autonomous vehicle unit said May 13 that it will start testing robotaxis in Arizona this week with human safety drivers on board.

As cars and trucks get smarter and more connected, the humble lights that have controlled the flow of traffic for more than a century could also be on the cusp of a major transformation.

NHTSA has opened an investigation into Zoox, the autonomous vehicle subsidiary of Amazon.com Inc., after two incidents in which its SUVs suddenly braked and were rear-ended.

Daimler Truck unveiled plans May 8 to begin operating an autonomous, battery-electric Freightliner eCascadia demonstration truck.

DETROIT — Federal highway safety officials want Tesla to tell them how and why it developed the fix in a recall of more than 2 million vehicles equipped with the company’s Autopilot system.

C.H. Robinson says it has launched an artificial intelligence platform that automates responses to email requests from shippers seeking answers to commonplace inquiries.

PHOENIX — The amount of safety technology available to fleets has exploded over the past 20 years, creating a new intersection of safety, technology and regulation.

Waabi Innovation opened a terminal in Lancaster, Texas, to serve as the center of the company’s operations in the state, which are at the heart of the self-driving truck specialist’s ambitions.