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Maryland Gov. Larry Hogan signed a bill April 5 that aims to reduce greenhouse-gas emissions by 40% by 2030 compared with the state’s GHG output in 2006.

COLUMBUS, Ind. — Regulation of greenhouse-gas emissions could increase the cost of a tractor-trailer combination by almost $14,250 through 2027, participants said at an ACT Research Co. seminar here, cautioning the regulation also could cause a pre-buy cycle of trucks similar to a decade ago.

NASHVILLE, Tenn. — Executives with North America’s two largest truck-trailer makers said they expect to meet Phase 2 federal greenhouse-gas regulations to be issued this year, even though parts of the proposal are ill-considered.

With the comment period now closed on the federal greenhouse-gas proposal to limit emissions from trucks, battle lines are drawn between vehicle owners and manufacturers who want fuel-efficient and well-tested trucks and environmental activists seeking the toughest standards as soon as possible.

The sweeping federal proposal to cut greenhouse-gas emissions and raise fuel efficiency for medium- and heavy-duty trucks over the next decade prompted qualified support, an outcry over poor air quality and calls for zero-emissions technologies at a public hearing Aug. 18 in Long Beach, California.

A report on the proposed Phase 2 greenhouse-gas rules found 87% of medium- and heavy-duty fleet operators surveyed earlier supported increased fuel efficiency and fewer emissions because the changes would also reduce what typically is trucking’s second-biggest expense, fuel.

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.

Suppliers of fuel-saving technologies for trucks and trailers said they expect their products will increasingly be installed at the factory level under the federal government’s proposed Phase 2 greenhouse-gas standards.