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California environmental regulators plan to plug a pair of loopholes in the state’s drayage regulation that allow some operators to game the system, port officials and state regulators said.

Teamsters union employees at YRC Worldwide Inc. approved by a wide margin a third round of wage and pension concessions to buoy the less-than-truckload carrier’s financial future, by providing a $350 million annual cost reduction.

ABF Freight System launched a two-pronged offensive against Teamsters union labor concessions for YRC Worldwide, saying the breaks for YRC violate the terms of the National Master Freight Agreement and unfairly disadvantage ABF to the tune of $750 million.

The recent discovery of explosives in overseas packages is triggering a fresh look at cargo scrutiny measures that could involve truckers and airlines, government officials and experts said.

Wal-Mart Stores Inc.’s vow to double sales of locally grown produce by 2015 should win favor with U.S. consumers but won’t have much effect on the world’s largest retailer’s supply chain, experts said.

A series of proposed amendments to California’s emissions-reduction regulations for heavy trucks would save the trucking industry more than $3 billion, in part by delaying some compliance requirements, according to a new report by the state’s environmental regulatory staff.

LEHIGH VALLEY, Pa. — Mack Trucks’ leadership rallied the company’s sales force here, urging dealers to sell more Pinnacle highway tractors in addition to the traditional vocational offerings. The formula for success, the leaders said, would be new ClearTech SCR engines, M-Drive transmissions and a “Made in the USA” appeal to economic patriotism.

HUNTSVILLE, Ala. — Navistar Inc. opened its new heavy-duty engine plant to journalists last week, showing where 114 employees are currently churning out 125 13-liter MaxxForce power plants a day.

The U.S. retail diesel average remained at $3.067 a gallon last week, leaving the price virtually unchanged for three weeks, the Department of Energy reported.

North American truck tire manufacturers have imposed a new round of price increases, generally about 8%, citing higher raw material costs that coincided with greater tire sales and some reports of tire shortages.