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As federal regulators ready mandates to curtail greenhouse-gas emissions and improve heavy-duty trucks’ fuel mileage, Environmental Protection Agency and trucking company officials said that research gleaned from EPA’s 8-year-old SmartWay program can help shape those rules.

President Obama has nominated Polly Trottenberg to serve as the Department of Transportation’s undersecretary for policy, the White House announced.

The Environmental Protection Agency has expanded its SmartWay Transport Partnership with a new initiative — one that aims to reduce emissions in drayage trucking.

President Obama’s proposed $129 billion Department of Transportation budget is for the first year of a comprehensive six-year transportation plan that will lay a new foundation for economic growth and competitiveness by rebuilding the nation’s transportation systems, DOT said Monday.