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Less than a week after she announced she would not seek another term in the Senate, California Democrat Barbara Boxer urged GOP leaders to turn their attention to funding the country’s aging transportation system.

Rep. Jared Huffman (D-Calif.) this week introduced a bill that would replace the diesel and gas tax with a carbon tax, the latest congressional proposal aimed at boosting transportation dollars ahead of the reauthorization of a major highway law this spring.

WASHINGTON — Strengthening commercial truck safety has made it onto the Most Wanted List of policies and actions issued annually by the National Transportation Safety Board.

WASHINGTON — Transportation Secretary Anthony Foxx said his department had plenty of information under which to justify opening the U.S. border to Mexican trucks despite a report from the Inspector General that said there were too few participants in a pilot program to determine if all Mexican trucks were safe enough to run U.S. roads.

WASHINGTON — Environmental officials from California and the East Coast said during a Transportation Research Board panel here that trucks still require special attention because of diesel emissions, even though such output became much cleaner from 1998 to 2010.

The Federal Motor Carrier Safety Administration said the nation’s trucking companies must continue random drug testing for at least 50% of drivers and other “safety sensitive” employees during 2015.