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Link Travel Time Estimation Using Uncompleted Link-passing GPS Probe Data in Congested Traffic Condition  

Sim, Sang-U (아주대학교 일반대학원 건설교통공학과)
Choe, Gi-Ju (아주대학교 환경건설교통공학부 교통공학전공)
Publication Information
Journal of Korean Society of Transportation / v.24, no.5, 2006 , pp. 7-18 More about this Journal
Abstract
Data for travel information Provision are regularly aggregated to Provide travel time information 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 can't pass by a link within aggregation interval and thereby create uncompleted link passing data. But these data are mostly generated during the congested times and therefore a method that uses such uncompleted link passing data are required. This study estimated queue dissipation length, green time and cycle that use GPS spot speed and developed a link travel time estimation method using such uncompleted link passing data. It also presents method and the overall process of using such data to estimate link travel time in a more accurate manner. As a result, MAPE 1.98% and MAE 4.75 sec of link travel time accuracy improvement has been reported, which is not much different from the real link travel time. The method Proposed here would be an alternative to increase the amount of GPS probe data, especially in congested urban arterial case.
Keywords
Information Collection Interval; Congestion Information; GPS; Uncompleted Link Passing Data; Link Travel Time;
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