Data for travel information provision are regularly aggregated from time frame point of view in other to offer travel time in a reliable and convenient manner and to manage traffic data and information efficiently. In most of practices in Korea, the GPS based travel time data are mainly aggregated every 5 minutes. As a result, some probes cannot pass by a link withinaggregation interval and thereby create uncompleted link passing data. But these data are mostly generated during the congested times and thereforea method that uses such uncompleted link passing data is required. This study estimated queue dissipation length, green time and cycle that use GPSspot speed and develop a link travel time estimation method using such uncompleted link passing data. This research presents method and the overallprocess of using such data to estimate link travel time in a more accurate manner. As a result, 1.98% of link travel time accuracy improvement has been reported, which is not much different from the real link travel time.
Abstract