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Volvo Trucks North America said its heavy-duty engines can now be equipped with an option to meet California’s anti-idling restrictions.

The February increase in truck tonnage that American Trucking Associations reported late last month — the fourth straight rise — may signal better times ahead for truckers and the U.S. economy, several industry analysts and observers said.

Auxiliary power units, initially pushed by federal and state governments to reduce air pollution despite concerns by fleet owners and owner-operators over their initial cost, are attracting more buyers who purchase them for the fuel savings, now that average diesel prices are about $4 a gallon.

The national average retail diesel price dipped 2.5 cents a gallon last week after six straight increases, the Department of Energy reported, even as gasoline rose 3.1 cents to set a new record high.

The cost to drive on the Indiana Toll Road rose for all vehicles with three or more axles, as well as two-axle vehicles that were not using the I-Zoom electronic tolling system, which debuted on the road last week.

The U.S. economy’s service showed continued contraction in March, but improved from February, the Institute for Supply Management said Thursday.

Safety advocacy group Road Safe America said it supports an effort by American Trucking Associations in urging the federal government to order the use of speed governors on heavy-duty trucks.

The Federal Railroad Administration said it is making its investigation reports of major train accidents and other incidents available online for the first time.