System-Specific Spare Bus Ratios Update: A Synthesis of Transit Practice.

摘要

Since 1995, when TCRP Synthesis 11: System-Specific Spare Bus Ratios was published, significant changes have occurred in the transit industry. The purpose of this synthesis is to update the findings of TCRP Synthesis 11, providing guidance to transit agencies on how various factors may affect optimal fleet size. It describes efforts agencies have employed to achieve the optimal fleet size and effective spare ratios and document successful practices in the United States and Canada. To develop this synthesis, the authors conducted an extensive TRIS literature search and document review, supported by readily available Internet search engines; a survey of selected transit agencies; and follow-up interviews with four case example agencies to gather information on the state of practice related to spare bus fleet ratios and optimal bus fleet sizing, including challenges, lessons learned, and gaps in information.