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Transportation software firm Xata Corp. said Monday it lost $1.4 million, or 17 cents a share, in its fiscal second quarter, compared with a loss of $900,000, or 12 cents, a year ago.

The California Air Resources Board has confirmed to Transport Topics that Mack Trucks Inc., Cummins Inc. and Volvo Trucks North America have received certification that their heavy-duty engines meet California’s nitrogen oxide emission standards, providing users an exemption from the state’s five-minute idling regulation.

President Bush declared this week as “National Transportation Week” and Saturday to be “National Defense Transportation Day,” the White House said Friday.

The average price of retail diesel slipped 2.8 cents last week from its all-time record — the first decline in four weeks — as the Department of Energy released a prediction that prices would remain above $4 a gallon for the foreseeable future.

American Trucking Associations launched a major initiative to meet the industry’s growing fuel-price crisis, supporting for the first time national truck fuel-economy standards.

Mexico’s principal trucking group said its members have lost more than $2 billion a year because the United States has refused to allow cross-border trucking as required by the 1993 North American Free Trade Agreement and that it is seeking damages through arbitration.

Wholesale inventories fell 0.1% in March, led by a decline in crude oil supplies, the Commerce Department said Thursday.

Commercial vehicle component maker Accuride Corp. said Thursday it lost $11.7 million, or 33 cents a share, in the first quarter, compared with a loss of $1.9 million, or 5 cents, a year ago.