This synthesis reviews current research and practical knowledge covering issues related to the use of idle reduction technologies in transit vehicles, including benefits, challenges, advantages, limitations, approaches, critical success factors, and lessons learned by agencies that have implemented them in their fleets. A survey of transit agencies showed that environmental concerns and saving fuel costs were the two most important reasons for reducing idling by transit fleets, followed by reduction in engine wear and other factors. Transit agencies view the nature of fleet operations, lack of understanding of the impact of idling, the cost of idle reduction devices, and lack of employee cooperation as the biggest obstacles for implementing idle reduction. Best practices and case studies in idle reduction are included, as is a summary of more than 100 federal, state, and location idle reduction regulations and incentives.
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