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Truck and engine manufacturer Navistar Inc. has challenged the Environmental Protection Agency’s authority to certify heavy-duty diesel engines using selective catalytic reduction to meet the agency’s 2010 standards for emissions of nitrogen oxides.

The U.S. economy contracted at an annual rate of 5.7% in the first quarter, a slight improvement from the 6.1% downturn reported last month, the Commerce Department said Friday.

U.S. consumer confidence has improved to the highest level since September, according to the Reuters/University of Michigan monthly consumer sentiment index released Friday.

Manufacturing activity in the Chicago declined in April, showing contraction for a seventh straight month, the Institute for Supply Chain Management-Chicago said Friday.

Truckers who pull refrigerated trailers into and around California have less than two months to prep for a rule that requires the small diesel engines that power older reefers to meet a state emission standard.

Intelligrated Inc. said Thursday it will acquire the U.S. operations FKI Logistex Holdings for $40 million in a cash deal with Melrose PLC, a British turnaround specialized, the Associated Press reported.

Third-party logistics company Agility said that it has acquired Trafinsa S.A. de C.V., a Mexican company with which it has partnered before.

UPS Inc. is in talks with one of its unions to attempt to avoid potentially laying off 300 pilots, about 10% of its total, Bloomberg reported.

India’s Tata Motors said it is unveiling a new line of trucks to be called the “world truck,” the New York Times reported Thursday.