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An Environmental Protection Agency advisory board is reviewing the quality and relevance of scientific and technical information used to justify repealing an Obama administration regulation that limits the production of glider trucks.

PORTLAND, Ore. — New U.S. tariffs on steel and aluminum imports could ultimately raise the price of trucks sold in the United States, top executives at the world’s largest commercial vehicle manufacturer warned.

In China, autonomous trucking is coming faster than expected. Chinese driverless truck startup Fabu Technology said June 12 that its driverless trucks already have taken part in open road tests and it plans to offer intercity cargo transportation this year, which is expected to radically reshape the nation’s freight transportation market.

U.S. retail sales of medium-duty trucks rose 13.7% in May to 20,801, driven by large gains in demand for Class 6 trucks, a highly competitive sector.

Daimler Trucks North America introduced two new connectivity services into its Detroit Connect portfolio, Detroit Connect Direct and a wireless in-cab device connection.

Nikola Motor Co. is starting the hiring process to staff its new Arizona research and development center, slated to open in November.

Allison Transmission Inc. has partnered with multiple North American telematics service providers to deliver transmission-health information by year-end.

Electric car maker Tesla Inc. is laying off about 3,600 workers mainly from its salaried ranks as it slashes costs in an effort to deliver on CEO Elon Musk’s promise to turn a profit in the second half of the year.

ACT Research Co. reported trailer orders in May climbed 30% to 23,300, based on its preliminary estimate. Trailer makers called the ongoing surge unprecedented.

In an abandoned lot on the outskirts of Sacramento, Calif., R1, a domed gray vehicle half the size of a Toyota Corolla, is practicing driving itself. It stops at stop signs, yields to people, and handles sharp turns, as other self-driving vehicles do on test courses in Silicon Valley, Detroit, and China.