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California clean-air regulators propose to force all older highway trucks running within state boundaries to be retrofitted first with diesel particulate filters, costing $8,000 to $20,000 and more, and then with equipment that reduces output of nitrogen oxides, in a complicated, staggered schedule in effect from 2010 through 2022.

The Commercial Vehicle Safety Alliance said 23.9% of the 52,345 vehicles that underwent comprehensive inspections during Roadcheck last month were placed out of service, the lowest percentage in the program’s 21-year history.

U.S. truck tonnage grew by 3.3% in May — the seventh straight monthly increase — according to a preliminary report from American Trucking Associations.

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High fuel prices are dampening demand for diesel and gasoline, and more Americans will stay home this Fourth of July holiday than last year, a truck stop trade group said Thursday.

The U.S. economy’s service sector contracted in June as prices reached a record high and employment reached a record low, the Institute for Supply Management said Thursday.

Heavy-duty components maker ArvinMeritor Inc. said it will buy Trucktechnic, a Belgium-based remanufacturer and distributor of commercial vehicle disc and foundation brakes and components.

U.S. manufacturing levels expanded in June for the first time in five months, the Institute for Supply Management said Tuesday.

An executive with Pilot Travel Centers said the number of diesel fuel thefts has soared this year.