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Federal regulators on July 13 formally published their proposal in the Federal Register that would tighten greenhouse-gas emissions for trucks, improve their fuel economy and regulate trailer efficiency for the first time.

Sen. James Inhofe, chairman of the chamber’s transportation policy committee, is scheduled to deliver keynote remarks July 16 at a conference focusing on public-private partnerships hosted by the American Road and Transportation Builders Association.

Wisconsin Gov. Scott Walker signed a $73 billion dollar state budget July 12, a day before announcing that he would join 14 other Republicans as a candidate for president of the United States.

As the 1980s drew to a close, efforts to enact laws in each state permitting use of 53-foot trailers were gaining momentum and now the larger trailers are legal everywhere in the United States with the exception of the District of Columbia.

Most major trailer manufacturers said they would expect to see an immediate surge of demand for 33-foot twin trailers, should the government approve their use for U.S. roads. They also said they would be ready to build the longer doubles as soon as fleets begin submitting orders.

WASHINGTON — The Environmental Protection Agency will continue to emphasize the Obama administration’s campaign against climate change from carbon emissions, even if all aspects of useful technologies are not known at present.

Sen. Cory Booker (D-N.J.) unveiled legislation July 10 that would increase minimum levels of insurance trucks must carry and called on the secretary of Transportation to mandate that truckers get paid for hours worked.

Consumer confidence in the United States eased last week from its highest level since the end of April, reflecting subdued views of the economy and buying climate.