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LOUISVILLE, Ky. — The two largest North American manufacturers of trailer refrigerated units each introduced updated product lines with an emphasis on hybrid power at the Mid-America Trucking Show here.

Passage of this legislation — the Employee Free Choice Act, also known as “card check” — would further erode American business competitiveness in the global marketplace.

The Environmental Protection Agency is poised to declare that greenhouse gas emissions endanger the public’s health and welfare — a move that could accelerate government rulemaking related to air quality.

LOUISVILLE, Ky. — Companies from China and Taiwan, including China’s largest truck manufacturer, formed the biggest foreign contingent at the Mid-America Trucking Show here for the second year in a row, seeing the show as a good way to enter the U.S. market.

WASHINGTON — Members of the Senate Environment and Public Works Committee criticized Transportation Secretary Ray LaHood and the Obama administration for refusing to consider an increase in the federal fuel tax.

Secretary of State Hillary Clinton said the United States is “working very hard to achieve a resolution” to a trade dispute that led to Mexico imposing tariffs on U.S. goods valued at more than $2 billion after President Obama signed a law ending a cross-border trucking plan.

A federal appeals court has thrown out the Port of Los Angeles’ ban on owner-operators and questioned the legality of concession requirements at the adjacent Long Beach port for drayage operators to file financial statements and give hiring preferences to experienced port drivers.

Spurred by trucking industry leaders, more states this year are banning contracts that shift liability for any incident that occurs on a shipper’s premises to freight carriers, joining more than a dozen other states that have acted to protect carriers from what they say are unfair contracts.

Rising oil prices and growing distillate demand pushed the U.S. national diesel average 7.3 cents higher to $2.09 last week, the first increase in more than two months, the Department of Energy reported.