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Determining Level-of-Service Criteria of Headway Adherence  

Go, Seung-Yeong (서울대학교 지구환경시스템공학부)
Park, Jun-Sik (서울대학교 지구환경시스템공학부)
Publication Information
Journal of Korean Society of Transportation / v.23, no.2, 2005 , pp. 151-160 More about this Journal
Abstract
In case of public transit such as bus system, the probability concept is used to evaluate the Level-of-Service of the operations. And each levels could be classified according to the linear probability value. (TCQSM: Transit Capacity and Quality of Service Manual-2nd Edition, TRB, Washington DC., 2003) In this case, the drivers or passengers wouldn't think that the service level isn't equivalent to the linear probability value. Thus the linear probability value doesn't exactly reflect the service level. This study shows the problems of using the linear probability value in classifying the service level through the case of evaluation of bus operation's punctuality, presented in TCQSM. To make up for the problems of such case, two methodologies are presented in this study. The method of determining Level-of-Service criteria using probability density of headway variation's distribution, presented in this paper, adequately reflects passenger's expected waiting time. According to the application result to real bus operation data, it tis better than the method of TCQSM to evaluate the reliability of bus operations. However further research about the relations between utility difference and passenger feeling of service level in necessary to apply the method that uses the utility function. It remains as the limitation of this paper.
Keywords
정시성;신뢰성;서비스수준;효과척도;대기시간;
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