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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.

BOSTON — Volvo Trucks joined the argument over allowing longer, heavier trucks on U.S. highways, saying Congress should allow them on the interstate system to relieve congestion, increase productivity, conserve fuel and cut greenhouse gas emissions.

Legislation introduced by two prominent members of the Senate Finance Committee could go a long way toward taking the air out of some politicians’ stampede to raise short-term revenue by leasing out or selling public highways and other public assets.

Several companies that blend diesel exhaust fluid, the urea solution used in truck engines with selective catalytic reduction systems, have had their blends certified by the American Petroleum Institute.

The U.S. Environmental Protection Agency last week took the first step toward creating a national cap-and-trade system, proposing a new rule that would establish a federal system for reporting carbon dioxide emissions and other greenhouse gases produced by large stationary and mobile sources.

President Obama called on Congress to approve legislation creating a cap-and-trade system aimed at reducing carbon emissions. Obama spoke on Feb. 24 to Congress in a joint session and invited spectators, who included the chairman of American Trucking Associations.

National Retail Systems has deployed 115 trucks to comply with the Clean Truck Program requirements set forth by the ports of Los Angeles and Long Beach, the company said Tuesday.

ARLINGTON, Va. — A top Navistar Inc. official said the company is pursuing its own solution to meet the 2010 U.S. emission standards, because it doesn’t believe the fuel savings claimed by competitors will justify the higher costs and more complicated systems associated with the new engines.

Paccar Inc.’s parts dealers are offering the company’s Engine Control Systems Purifilter, an aftermarket passively regenerating diesel particulate filter approved by the California Air Resources Board for installation and use in a wide variety of Class 8 trucks.