Diesel's national average price tumbled to its lowest point since 2009 this week, falling 5.9 cents to $2.723 per gallon, according to the July 27 report from the Department of Energy. Gas also fell 5.7 cents.

Daimler plans to test self-driving trucks as early as this year, the head of the company's global truck and bus unit told a German newspaper.

Truck maker Navistar Inc. has finalized an agreement to supply Quality Cos., a subsidiary of truckload carrier Celadon Inc., with 9,000 Class 8 tractors during the next three years.

The Senate is suddenly contentious on amendment issues that threaten to stall or derail the passage of a highway bill before it can be sent to the House prior to the expiration of funding authorization on July 31. Here's a look at what's ahead for trucking on Capitol Hill this week.