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Heavy-duty truck engine idling results in significant costs, fuel consumption, emissions, noise, and engine maintenance. Two promising alternatives to idling, grid connection ("shore power") and onboard auxiliary power units (APUs), are being pursued by industry and government. Their attractiveness is uncertain, however, because of limited information about truck operations and driver behavior. A nationwide survey of long-haul truck drivers was conducted to characterize truck operations and driver behavior better. Key variables included usage rates for accessories, duration of idling, and engine speed at idle. It was found that long-haul truck engines idled for an average of 34% of total engine run time, roughly 1,700 h per truck annually. But these averages are deceptive. Approximately 10% of drivers reported idling 10% or less of engine run time, while another 10% reported idling more than 54% of engine run …