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American Trucking Associations said it has joined other trade associations in asking Congress to help prevent excessive speculation in commodities markets.

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

Navistar Inc. could face an uphill battle in its challenge to the Environmental Protection Agency’s 2010 truck exhaust regulations, industry analysts and other manufacturers said.

WASHINGTON — Victor Mendez, the Obama administration’s choice to head the Federal Highway Administration, said safety and productivity would be among the factors he would consider when examining possible changes to federal truck size-and-weight limits.

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.

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.

President Obama will nominate Anne Ferro, president of the Maryland Motor Truck Association, to head the Federal Motor Carrier Safety Administration, the White House announced last week.

Despite the lack of a new, long-promised federal stopping-distance rule for heavy-duty trucks, brake companies are making — and original equipment manufacturers are offering — a growing array of electronic systems designed to help truckers stop faster and maintain more control.

YRC Worldwide Inc. last week said it was consolidating top management of its less-than-truckload services as it also pursues moves to conserve cash, such as selling its headquarters and negotiating a proposed pension deal for its unionized employees.