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Freight trains, unlike passenger trains, have resumed running across the tracks beneath a San Clemente, Calif., landslide that continues to threaten San Diego County’s only rail link with the rest of the United States.

California drivers will experience worse highway and road conditions due to lost diesel and gasoline tax revenue in state coffers, according to legislative analysts.

In a slap to California, Ohio has a law taking effect in March banning agencies from adopting that state's emissions regulations and protecting the sale and use of diesel and gas vehicles.

California Gov. Gavin Newsom has proposed significant cuts to clean energy and transportation programs designed to help the state confront the worsening effects of climate change.

General Motors Co. said in a lawsuit that San Francisco unfairly taxed it $108 million over seven years, despite the automaker having very low sales and almost no personnel in the city.

A judge has denied a challenge to the South Coast Air Quality Management District's landmark rule intended to clear Southern California skies of exhaust tied to the logistics industry.

California’s race to have near-total-zero-emission passenger vehicles and heavy trucks will result in a greater need for electricity at higher prices, an ATRI report says.

Two interstate companies operating heavy-duty truck fleets in California agreed to legal settlements with the U.S. Environmental Protection Agency.

Stellantis NV, owner of the Jeep and Ram brands, is petitioning against emissions standards adopted by California and 13 other states that it says give competitors unfair advantages.

The National Transportation Safety Board wants changes in how containerships are anchored off Southern California to help prevent oil pipeline ruptures like the 2021 spill off Huntington Beach.