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State officials figure the Volkswagen diesel emissions testing scandal added an extra 10,000 tons of noxious nitrogen oxide to California’s air. To make up for it, the state will use $423 million of Volkswagen penalty money to cut the same amount of nitrogen oxide by subsidizing the purchase of zero-emission trucks, buses and other vehicles.

More fleets are requesting downsped engines that run at about 1,100 rpm at highway speeds, significantly slower than previous generations of diesels.

Since the Uber accident in March, autonomous car researchers’ eyes have been opening to the need to teach robots how to drive in the dark and avoid people who wander into the road.

Used truck sales in April reached 22,900, up 9% from 21,000 in the same month in 2017, according to ACT Research Co.’s industrywide estimate.

This spring, a struggle for market share in online tire retailing turned into a battle for dominance as giants Goodyear and Bridgestone paired off against Amazon and Sears.

Uber is shutting down testing operations in Arizona and focusing instead on testing in Pittsburgh and San Francisco, according to an internal e-mail from Eric Meyhofer, a Carnegie Mellon University graduate and the head of Uber’s self-driving car operations.

FLAT ROCK, Mich. — Executives with the North American arm of engineering company Robert Bosch showed off an electric-hydraulic steering system for Class 8 trucks that they said will aid in the transition to autonomous commercial vehicles and announced a “breakthrough” in substantially reducing emissions of nitrogen oxide from diesel.

SCHAUMBURG, Ill. — The good news is that heavy truck brake technology is moving forward at a dizzying pace — a clear boon for highway safety. Unfortunately, there is a troubling knowledge gap among a large segment of the technicians responsible for keeping up with those brake maintenance advances — even a lack of basic brake maintenance.

Vehicle component manufacturer Stoneridge reported it would move its operations in Suzhou, China, to a new and larger facility about 11 miles east.

Ryder System Inc. has launched a smartphone app that permits commercial fleet users to get a vehicle into a repair facility for either scheduled or unexpected maintenance and also compare real-time fuel prices.