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The accuracy of the Global Positioning System could be compromised as early as next year if the U.S. Air Force cannot meet an ambitious schedule for space and ground infrastructure deployment, according to a new report from the Government Accountability Office.

Retail diesel prices in the United States hit their highest mark since December, as increasing crude oil costs work deeper into the fuel supply.

The average price of a gallon of diesel fuel jumped 7.8 cents last week to $2.352 a gallon, the highest level since December, while gasoline rose another 8.9 cents as crude oil pushed near $70 a barrel, the Department of Energy reported.

Truck and engine manufacturer Navistar Inc. has challenged the Environmental Protection Agency’s authority to certify heavy-duty diesel engines using selective catalytic reduction to meet the agency’s 2010 emission standards, saying EPA skipped an important regulatory step.

Air and freight forwarder UTi Worldwide reported a decline in net income and revenue for its fiscal first quarter, due the ongoing recession.

California has set up a loan program for truckers to meet looming stricter emissions requirements next year, but some carriers say the industry is in such a difficult state that they may not last long enough to get the loans, the Santa Cruz (Calif.) Sentinel reported Tuesday.

Onboard scale manufacturer Air-Weigh said that Kalyn Siebert, a subsidiary of Heil Trailer International, has made the Air-Weigh’s trailer scales standard on its heavy-haul trailers.

Truckers who pull refrigerated trailers into and around California have less than two months to prep for a rule that requires the small diesel engines that power older reefers to meet a state emission standard.