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California’s transport refrigeration unit rule illegally imposes a national requirement on all motor carriers that enter the state, attorneys for American Trucking Associations and the Truckload Carriers Association told a federal appeals court.

Canada-based transportation firm Trimac Income Fund said it lost C$700,000 in the first quarter, or 5 cents per unit, compared with a profit of C$600,000, or 2 cents, a year ago.

SAN DIEGO — A “perfect storm” of a nose-diving economy, high fuel prices and governmental missteps have all combined to ravage the trucking industry and the companies that supply its equipment, according to Jim Hebe, senior vice president of North American sales for Navistar Inc.

Details of the Environmental Protection Agency’s record $10.5 billion fiscal 2010 budget proposal — a 37% increase — quickly set off a partisan debate in Congress last week over the agency’s plans to regulate greenhouse gas emissions.

The average price of retail gasoline soared last week, jumping 16.2 cents a gallon to a U.S. average of $2.24, leapfrogging diesel, which rose 3.1 cents to $2.216. Gasoline prices exceeded diesel for the first time in nearly two years.

The debate over future surface transportation policy is likely to be directed by Congress, rather than the Obama administration, several industry lobbyists said following the recent release of nu-merous documents.

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.