A truck replacement program designed to cut diesel emissions has been included as part of a legal settlement between the South Carolina State Ports Authority and an environmental group over expansion at the Port of Charleston.

The U.S. Environmental Protection Agency, noting “growing interest” in alternative-fuel conversion systems, recently proposed to streamline certification of aftermarket conversions that turn Class 8 diesel engines into engines that can burn diesel and natural gas.

The California Air Resources Board has awarded $200 million in Proposition 1B funds to help cut emissions from heavy-duty trucks and other sources in the state’s four busiest trade corridors.

A new study has found that nationwide adoption of a low-carbon fuel standard would increase the retail cost of motor fuel by as much as 170% over a 10-year period.

The National Highway Traffic Safety Administration plans to propose fuel efficiency standards starting with model year 2016 commercial medium- and heavy-duty on-highway vehicles, and said it will prepare and environmental impact statements as part of the procedure.

A new U.S. Department of Transportation study hints that the Obama administration’s recently announced plans to increase heavy truck fuel efficiency and to reduce greenhouse gas emissions likely will rely on a combination of existing aerodynamic design technologies and future diesel engine and drivetrain modifications that barely have left the laboratory or still are in development.

A new Department of Transportation study hints that the Obama administration’s ambitious plans to increase heavy truck fuel efficiency and reduce greenhouse gases emissions will likely rely on a combination of existing aerodynamic design technologies and future diesel engine modifications that have barely left the laboratory or are still under development.

Two U.S. senators last week unveiled a carbon emissions reduction bill observers said would significantly increase the cost of diesel fuel.

Two senators unveiled a long-awaited carbon emissions reductions bill Wednesday that could spur increases in the cost of diesel fuel for motor carriers.

California environmental regulators can continue enforcing the state’s transportation refrigeration unit retrofit rule, a federal appeals court has ruled.