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U.S. manufacturing activity fell in November to the lowest point since July 2009, the Institute for Supply Management said Monday.

The California Air Resources Board issued a warning that enforcement of new emissions regulations will go into effect Jan. 1 for heavy-duty trucks with model year 2000 to 2004 engines.

We came. We watched and listened. And we learned. The amount of information that was flowing from the stage during the first day of American Trucking Associations’ Summit on Natural Gas in Trucking last week was prodigious.

A few weeks ago, I received a call from the staff of U.S. Rep. Renee Ellmers (R-N.C.). My family operates a business with more than 750 pieces of equipment constantly on the road in America.

ARLINGTON, Va. — The emergence of natural gas as a viable fuel for trucking is dependent on progress in overcoming infrastructure hurdles such as a dependable fuel supply network, a new generation of engines and driver acceptance, industry experts said last week.

Orders for new freight trailers jumped 29.1% in October from the same month in 2011, the highest monthly total since January, as the end-of-year rush appeared to arrive early, ACT Research reported. Sales totaled 23,597.

The total number of U.S. heavy-duty vehicles in operation rose 0.9% during the third quarter, the highest level of growth since the third quarter in 2009, according to a report from R.L. Polk & Co.

ARLINGTON, Va. — Favorable economics stemming from the vast domestic supply of natural gas will accelerate the trucking industry’s use of the fuel, producers of that fuel said here last week.