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Carrier Pitt Ohio is testing two natural gas-powered Mack Anthem models equipped with Cummins Westport ISX12N engines as it seeks to use alternative fuels to reduce emissions.

New York City and Los Angeles, worried that a Senate self-driving car bill would make them hand over control of their streets to the federal government, have found a powerful ally: Minority Leader Chuck Schumer (D-N.Y.).

The Federal Highway Administration has withdrawn its rule that would have required state departments of transportation and metropolitan planning organizations to report year-over-year changes in carbon dioxide emissions on U.S. interstates and major highways.

Tim Sylvester, CEO of Kansas City, Mo.-based Integrated Roadways, thinks his startup company’s “smart pavement” — bristling with sensors and the latest fiber-optic and wireless technology — could be a lifesaver in mishaps.

The California Air Resources Board has approved amendments to toughen state standards on heavy truck smoke opacity limits as well as require motor carriers with two or more trucks to report their annual smoke test results to the agency.

Virginia transportation officials have planned a series of meetings in June to gather public feedback as their study of the Interstate 81 corridor takes shape.

A bipartisan group of senators recently introduced a bill that would relax both electronic logging device and hours-of-service requirements for livestock haulers.

State officials figure the Volkswagen diesel emissions testing scandal added an extra 10,000 tons of noxious nitrogen oxide to California’s air. To make up for it, the state will use $423 million of Volkswagen penalty money to cut the same amount of nitrogen oxide by subsidizing the purchase of zero-emission trucks, buses and other vehicles.

More fleets are requesting downsped engines that run at about 1,100 rpm at highway speeds, significantly slower than previous generations of diesels.