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Truck drivers hauling water and sand to U.S. oil and natural gas shale wells cannot extend their daily driving hours by using an exemption targeted for special oilfield service equipment, Bloomberg reported Tuesday, citing the Department of Transportation.

An index of the U.S. economy’s service sector improved in May, the Institute for Supply Management said Tuesday.

Roadrunner Transportation Systems said it has acquired Massachusetts-based refrigerated truckload carrier CTW Transport for about $7.5 million.

Kentucky’s gas tax is increasing next month by 2.4 cent to 32.3 cents a gallon due to an automatic tax increase, the Associated Press reported.

FedEx Corp. said it has retired 24 jets to reduce capacity in its U.S. Express division, and will take an $84 million, or 26 cents–per-share, charge in its fiscal fourth quarter that ended May 31.

Sales of all diesel retrofit devices in the United States declined in 2011 from the previous two years, according to the Manufacturers of Emission Controls Association.

Factory orders fell 0.6% in April, the second straight monthly decline, the Commerce Department said Monday.

U.S. automobile and light truck sales rose 18% in May to 1.4 million vehicles, news services reported.

Truck and auto component maker Delphi Automotive has entered into exclusive talks to acquire a unit of FCI Group from Bain Capital for about 764 million euros ($958 million), Bloomberg reported.