This paper describes a method of evaluating the level of service of road networks based on the average travel time and travel time reliability using electronic toll collection (ETC) data. This paper focuses on the variance of travel time under normal circumstances; therefore, traffic accidents are removed from the database, and the effect of individual vehicle preference is excluded. The paper evaluates the travel time distribution based on the average travel time from ETC data for each 15min interval. The levelof service in an actual intercity highway network was analyzed using the proposed method. This analysis showed that the level of service fluctuatedaccording to the road section analyzed, the month, and the time of day, and these findings were confirmed by the shape of the cumulative distribution and indices of average travel time and travel time reliability. Using the evaluation method described in this paper, the analysis also confirmed the change of travel time distribution between major interchanges after the opening of a new intercity highway route.
Abstract