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A recent study by one of the world’s largest makers of Global Positioning System navigation devices has concluded that Seattle is the most traffic-clogged city in the United States.

The Federal Motor Carrier Safety Administration said it was delaying some intermodal chassis safety requirements for six months to give operators of that equipment more time to create a database to track the condition of each chassis.

Flatbed carrier Arrow Trucking Co. closed suddenly Dec. 22, shutting off its fuel cards and leaving an unknown number of drivers for its 1,400 trucks stranded around the country, industry and federal officials have said.

PeopleNet said regional less-than-truckload carrier Dohrn Transfer Co. will begin installing its onboard technology system in January.

Flatbed and heavy specialized carrier Arrow Trucking has closed down, the Associated Press reported.

The steep, yearlong decline in heavy-duty U.S. truck sales slowed to 16.4% below the 2008 level in November, or nearly half as much as the 11-month fall of 31%, according to the latest survey by WardsAuto.com.

Roadrunner Transportation Services Holdings Inc. said it bought less-than-truckload carrier Bullet Freight Systems Inc. on Dec. 14 to expand its services in the western United States.

Cummins Inc. named Rich Freeland to be the next president of its engine business, succeeding Jim Kelly, who the company said Tuesday will step down from that position early next year.

Cummins Inc. said late Tuesday that Jim Kelly, president of its engine business, will leave the position in March and that it will name a successor “in the very near future.”