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A Measure for Travel Time Reliability  

Chang, Justin Su-Eun (한국교통연구원 육상교통연구본부)
Kang, Ji-Hye (한국교통연구원 육상교통연구본부)
Lee, Seung-Jun (한국도로공사 도로교통연구원)
Publication Information
Journal of Korean Society of Transportation / v.26, no.5, 2008 , pp. 217-226 More about this Journal
Abstract
The term, travel-time reliability, refers to variations in journey time that travelers cannot predict. The purpose of this paper is to suggest a standard way to measure travel time reliability. A modified buffer time indicator is proposed. The index is represented by the difference between planned and actual travel times based on lognormal type travel time distribution. Using this framework, a constant function for railways and a negative parabola function for roads are discussed. The model developed is applied to the real data of Korean road and rail usages to empirically verify the methodology proposed. In this process, the unit value of travel time reliability for each group is estimated. The result of this research is expected to be helpful of conducting more cautious economic feasibility studies of transport.
Keywords
Reliability; Punctuality; Lognormal distribution; Planned travel time; Actual travel time; Transport appraisal;
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