Travel time reliability has become more important in modern society as industrial society and household require just in time transport for business and private activities. The data collection system of traffic flow, on the other hand, has made it possible to handle huge size of travel time data. This paper aims to examine the fundamental characteristics of travel time reliability measures using the traffic flow data in the Han-shin expressway network. Then, they are compared with the previously proposed traffic congestion measures, and the differences among several routes in the network are investigated.
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