In order to provide reliable travel time information by probe vehicle system, a huge amount of travel time data should be collected. To minimize cost of data collection from probe vehicle with certain reliability level, the number of required probe vehicles and its optimal regional allocation should be examined. Therefore, this study proposes a new methodology to estimate the number of probe vehicles required to ensure the reliability of travel time estimation. It aims to verify the feasibility of reducing the number of probe vehicles from that required by the conventional methodology. Also, the feasibility of reducing probe vehicles by estimating travel time with existing traffic detectors is verified. The study concluded that the required number of probe vehicles estimated by the new methodology is less than that estimated by the conventional methodology, and that the use of probe vehicle systems leads to quick development of traffic information collection system.
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