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RENTON, Wash. — In the struggle to squeeze a few more miles out of each tank of fuel, truck makers are designing tractors with the aid of computer models and wind tunnels more generally used to tweak race cars or airplanes.

BorgWarner Turbo Systems said it is laying off 140 workers at its plant in Arden, N.C., that manufactures turbochargers for diesel trucks and construction equipment.

Two key safety indicators improved to their best-ever levels during 2007, according to data just released by the Department of Transportation and analyzed by Transport Topics.

ARLINGTON, Va. — A top Navistar Inc. official said the company is pursuing its own solution to meet the 2010 U.S. emission standards, because it doesn’t believe the fuel savings claimed by competitors will justify the higher costs and more complicated systems associated with the new engines.

ORLANDO, Fla. — Kevin Knight, chief executive officer of Knight Transportation, touted trucking’s efforts in recent years to become more environmentally friendly, and said the industry should work to improve its green message to the public.

UPS Inc. and the U.S. Postal Service have agreed to work together to make it easier for consumers to return goods purchased online, a move that more closely aligns the nation’s mail delivery system with the largest commercial package carrier.

Last January, our company launched an “instructor-of-the month” program. We began by inviting directors of truck-driver training programs to nominate individuals, and then we interviewed the winning instructors.