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For carriers, the effort to find the best nonidling cooling option for the truck cab has not been without starts and stops.

A year after U.S. officials agreed to allow Mexican trucks into the country, only four Mexican carriers are participating, far below the number the United States has said would be needed to judge the safety of Mexican trucks.

The federal Compliance, Safety, Accountability program is in danger of turning its focus from its original intent — to reduce truck-related crashes, fatalities and injuries, American Trucking Associations said Thursday.

Allied Systems Holdings Inc., the largest U.S. car hauler, last week filed for Chapter 11 bankruptcy protection, the second time it has done so, saying it’s continuing to provide service and blaming weakness in the car and light-truck business for the move.

The Midwest-based intermodal trucking company formerly known as Universal Transportation Services has changed its name to Calhoun Truck Lines, the company announced.

Canadian bulk trucking company Trimac Transportation said it will acquire Ontario-based specialized bulk carrier Liquid Cargo Lines.

Bigger trucks and a field study of the hours-of-service restart provision are among items American Trucking Associations said it wants included in any highway bill that emerges from the House-Senate conference committee weighing the legislation.

Trucking managers in information technology and finance will meet jointly in Tampa, Fla., next month to explore opportunities for efficiency improvement through IT and strategies for handling significant tax changes expected at the end of 2012.

ALEXANDRIA, Va. — Low participation by Mexican carriers in the cross-border trucking program could lead to the resumption of Mexican tariffs on U.S. goods, an official with the Federal Motor Carrier Safety Administration said.