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The diesel engines built this year are more efficient as the second step of greenhouse-gas Phase 1 standards takes effect. These power plants also offer improved reliability, advanced engineering, reduced maintenance and performance improvements that fleet managers and truck drivers will notice, industry experts said.

California is proceeding with its Phase 2 greenhouse-gas emissions rule for trucks — designed to be “harmonized” with the similar fed-eral rule released last year — no matter the fate of the U.S. regulation.

Eight states and five environmental groups filed motions with a federal appellate court on Jan. 23, asking to intervene in a lawsuit brought by the Truck Trailer Manufacturers Association against two federal agencies over the Phase 2 greenhouse gas rule on truck emissions.

Two trade associations filed petitions for review of the Phase 2 final federal rule on greenhouse-gas regulations for trucks, and the U.S. Court of Appeals for the D.C. Circuit has combined them into a single case to be heard by a panel of three judges to be chosen later.

If results from Phase 1 regulation of greenhouse-gas emissions from trucks are an indication, Phase 2 standards should improve vehicle efficiency further but also add cost and complexity to new trucks, according to an industry webinar on the final rule issued in August.

A rule aimed at reducing carbon dioxide and other greenhouse gas emissions from heavy- and medium-duty trucks will take effect in two months, federal regulators announced Oct. 25.

The leaders of the transportation committee in the Senate are at odds over a Federal Highway Administration proposal that would measure the value of state and municipal transportation projects by their greenhouse-gas emissions.

Trailer manufacturers are the first companies serving the trucking industry that will have to meet provisions of the new federal greenhouse-gas rule.

The Obama administration rolled out the final version of its Phase 2 rule on greenhouse gas emissions from heavy- and medium-duty trucks Aug. 16, with top administration officials saying the mandate will save 1.1 billion metric tons of carbon dioxide and other GHGs through the final rollout date of 2027.