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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.

Consumer trust in self-driving cars has plummeted after high-profile roadway fatalities, with almost three-quarters of Americans now saying they are too afraid to ride in an autonomous vehicle, according to a new survey.

Well-known manufacturers as well as newcomers to the industry are advancing electric trucks, and both sectors will play important roles in the vehicles’ future, industry experts said.

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

As truck manufacturers begin to add electric-powered models to their product lineups, they are targeting city and regional routes as early applications for these vehicles.

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.

A Senate committee on May 22 unanimously approved a bill that would require the Department of Health and Human Services to provide an explanation for a 15-month delay in issuing mandatory federal hair testing guidelines for safety-sensitive transportation employees such as truck drivers.