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Ultra-low-sulfur diesel, the standard fuel of heavy-duty trucking since late 2006, has more energy content than engineers originally had expected, a welcome surprise, according to a study from the American Transportation Research Institute.

Ray Kuntz, immediate past chairman of American Trucking Associations, has joined the board of directors at trailer tracking firm SkyBitz, the company said Monday.

The average retail price of diesel fuel remained relatively stable for a second week, dropping 1.8 cents to $2.296, the U.S. Department of Energy reported.

Most new heavy-duty trucks sold in the United States and Canada, beginning when 2010 models are introduced, will use selective catalytic reduction technology to cut emissions, which will require the addition of a new fluid to work properly. And truck stops throughout the nations are trying to prepare to meet the demand for this new product.

WASHINGTON — Ray LaHood, President Obama’s choice to lead the Department of Transportation, said tolls and public-private partnerships should be among the ways Congress funds infrastructure construction, but existing interstate highway lanes should remain toll-free.

In its final hours, the Bush administration emphatically denied a request to overturn its controversial driver hours-of-service rule, leaving the twice-rejected measure in place, at least for now.

The Senate Thursday confirmed President Obama’s picks to head the Department of Transportation and Environmental Protection Agency, the Associated Press reported.

Less-than-truckload carrier YRC Worldwide said Friday that it will use its YRC brand name for its combined Yellow Transportation and Roadway network.

Forward Air Corp. lowered its fourth-quarter earnings guidance, citing “severely worsening economic conditions” in the second half of the quarter.