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

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.

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.

NEW YORK — Shares of Tesla stock rallied April 29 after CEO Elon Musk paid a surprise visit to Beijing over the weekend and reportedly won tentative approval for its driving software.

DETROIT— The U.S. government’s auto safety agency is investigating whether last year’s recall of Tesla’s Autopilot driving system did enough to make sure drivers pay attention to the road.

The federal government awarded Fort Worth, Texas, $2 million to test weather sensors on autonomous freight truck routes.

DETROIT — The driver of a Ford electric SUV involved in a February fatal crash in Texas was using the company's partially automated driving system before the wreck, investigators said.

HANOVER, Germany — Volkswagen Commercial Vehicles is to test its self-driving ID Buzz AD electric van for the first time under realistic conditions and with passengers on board.