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LAS VEGAS — Autonomous and electric-powered trucks hold great potential to improve safety and efficiency in the freight transportation sector, but it will take time for these emerging technologies to overcome various market challenges and achieve widespread commercialization, industry executives said.

General Motors-owned Cruise is working to expand its paid service to all of San Francisco and run it 24 hours a day.

TuSimple Holdings Inc., an autonomous trucking startup that’s been the subject of U.S. investigations, said it hasn’t shared self-driving technology with another startup with Chinese ties.

SACRAMENTO, Calif. — As California regulators explore new rules to put self-driving semitrucks on the road, labor unions are rushing to the state Legislature to ask for a new law they say will protect their jobs.

The U.S. Justice Department has requested documents from Tesla Inc. related to its Autopilot and “Full Self-Driving” features, according to a regulatory filing.

A tweet from Elon Musk indicating that Tesla might allow some owners who are testing a “Full Self-Driving” system to disable an alert that reminds them to keep their hands on the steering wheel has drawn attention from U.S. safety regulators.

Starting in 2023, Tesla will effectively be banned from advertising its vehicles as Full Self-Driving in California under a new law signed by Gov. Gavin Newsom.

The U.S. government’s highway safety agency said Dec. 22 it will send teams to investigate two November crashes in California and Ohio involving Teslas that may have been operating on automated driving systems.

General Motors Co.’s Cruise unit started offering rides with its self-driving taxi business in two more cities, expanding beyond San Francisco with cars now operating in Phoenix and in Austin, Texas.

U.S. safety regulators are investigating reports that autonomous robotaxis run by General Motors’ Cruise can stop too quickly or unexpectedly quit moving, potentially stranding passengers.