Ten years ago, we would have predicted that by now no truck would be idling anywhere in the United States,” says Mike Roeth, executive director of the North American Council for Freight Efficiency, which studies fuel-efficiency tactics and technologies.

Yet despite widespread anti-idling laws and lots of available idle-reduction technology, go to any truck stop today and you’ll see plenty of trucks still idling.

Even in California, which has the strictest emissions regulations in the country, new trucks with advanced emissions control systems can be certified as “Clean Idle.”

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