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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.

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.

Driver turnover at large truckload carriers fell in the third quarter to 43% a year, the lowest level since American Trucking Associations began tracking the data in 1995.

If people won’t voluntarily avoid using handsets while operating a motor vehicle, there are ways to render cellular connections inoperable, or at least report the driver’s activities to management.

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.

Representatives of several high-tech firms said they already are marketing, or soon will offer, systems designed to prevent motorists from texting and talking on cell phones while driving their vehicles.

Navistar Inc., which said it has spent $600 million to develop its 2010 exhaust gas recirculation engine, said the company is losing sales of next year’s model because federal regulators “helped create the false impression” among customers that only urea-based after-treatment systems would meet 2010 federal emissions standards.

Kenan Advantage Group will acquire the assets of Reinhard Transportation, a Federal Way, Wash., fuel hauler that runs 64 trucks.

When large, corporate-owned fleets such as U.S. Foodservice and Wal-Mart Transportation were pressured by their owners to meet environmental sustainability goals even during the current faltering economy, it made the news.