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The California Air Resources Board said it is now enforcing the identification and reporting requirements for California-based transport refrigeration units on trucks, trailers, shipping containers and rail cars assigned to terminals in the state.

Most Transport Topics readers have experienced the current downturn firsthand — dwindling freight demand, fluctuating fuel prices, clean-engine mandates and downward-spiraling leading indicators.

Two senior House Democratic leaders last week introduced a sweeping greenhouse gas bill that includes a cap-and-trade program and would expand motor carriers’ use of SmartWay technologies.

Rising oil prices and growing distillate demand pushed the U.S. national diesel average 7.3 cents higher to $2.09 last week, the first increase in more than two months, the Department of Energy reported.

WASHINGTON — Members of the Senate Environment and Public Works Committee criticized Transportation Secretary Ray LaHood and the Obama administration for refusing to consider an increase in the federal fuel tax.

Several companies that blend diesel exhaust fluid, the urea solution used in truck engines with selective catalytic reduction systems, have had their blends certified by the American Petroleum Institute.

The Environmental Protection Agency may seek to limit greenhouse gas emissions, the Washington Post reported Tuesday.

LOUISVILLE, Ky. — Cummins Inc. said it is confident the Environmental Protection Agency will approve the company’s use of copper zeolite in engines de-signed to meet 2010 emission rules, removing any potential roadblock for the new models.

Transportation officials in Colorado said initial feedback from commercial drivers who have used the AutoSock, a heavy-duty cloth covering for tires, has been positive, and it could become an accepted alternative to metal snow chains.

LOUISVILLE, Ky. — Truck and engine makers took advantage of one of the last major marketing forums before the onset of new federal emission rules to starkly set the stage for buyers of heavy-duty vehicles in choosing between SCR and EGR for their diesel engines.