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Clean Energy Fuels Corp. said Tuesday it will expand its network of liquefied natural gas stations in southern California in large cities and along major truck routes, with a goal to expand into the Southwest.

The Environmental Protection Agency has not yet said how it intends to require heavy trucks to curb greenhouse gas emissions, but a report on the agency’s Web site projects that an advanced notice of rulemaking could be posted as early as June.

UPS Inc. said Tuesday it has donated supply-distribution barcode technology for use by the Salvation Army in its Haiti relief efforts.

TAMPA, Fla. — Some of America’s largest fleets reported general acceptance of the 2007 generation of diesel engines, although some said they had difficulties and higher expenses with them, in assessments offered during the annual meeting of the Technology & Maintenance Council here recently.

Consumer confidence fell this month to its lowest level since April 2009, the New York-based Conference Board reported.

A year into the Obama administration, American Trucking Associations President Bill Graves said the trucking industry’s challenges are primarily regulatory, rather than legislative, because of the gridlock that has enveloped Congress since last year.

A group including motor carriers, businesses, several members of Congress and a conservative public interest legal foundation has filed a lawsuit in federal appeals court challenging the U.S. Environmental Protection Agency’s finding that greenhouse gas emissions are a danger to public health.

The California Air Resources Board has launched a $20 million funding assistance program to stimulate the purchase of hybrid trucks and buses.

The company uDrove LLC has released a software program that it said will handle all of the trucking industry’s compliance management needs with a smart phone.