United States Department of Transportation
i
Passenger Vehicle Idling in Vermont, Phase II
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2014-08-01
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[PDF-1.40 MB]
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Abstract:While trip-start and trip-end idling, including idling at intermediary stops along a route, cannot be completely eliminated, the duration of these discretionary idling events is largely controlled by the driver and can be considered part of travel or driver behavior. In contrast, in-travel idling events (i.e. non-discretionary) occur when the vehicle is stopped prior to reaching its destination due to conditions such as congestion or a red traffic signal that are outside the driver’s control. The distinction between discretionary and in-travel idling is critical because different interventions may be required to reduce the duration and frequency of each of these types of events. Discretionary idling events, for example, could be reduced with anti-idling ordinances and driver education programs such as eco-driving. Reducing in-travel idling, in contrast, may depend on factors such as retiming signals, reducing congestion or vehicle routing. Both in-travel and discretionary idling can be reduced or eliminated by vehicle technology which automatically shuts-off or starts-up the engine when the vehicle stops. This study is solely focused on discretionary idling that may be addressed through behavior change. In this phase of the project, in-vehicle data collection was undertaken for 10 days each with 86 volunteers in Addison County, Vermont between January and July 2013. The location and duration of each discretionary idling event was extracted from on-board instruments. The duration of discretionary idling was analyzed as a function of area type, weather, individual household and vehicle variables.
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