LONG-TERM MONITORING OF TRAFFIC CAPACITY BY TRAFFIC DETECTOR DATA

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  • 車両検知器データによる交通容量の長期変動モニタリング

Abstract

This study evaluates the long-term changes of traffic capacity on an urban expressway over ten years using the long-term traffic volume data obtained by traffic detectors. Traffic capacity is one of the most important indicators in road management. Traffic capacity mainly depends on factors that does not change over years, such as the geometry of the road, while it can also depend on factors that may change over time, such as vehicle performances and drivers' behaviour. It implies that traffic capacity may not be constant but changing over years. Using the data observed by vehicle detectors of Hanshin expressway from March 2003 to June 2014, long-term changes of traffic capacity were estimated. The capacity was estimated by fitting the observed volume-density data to Drake's formula. In addition, 99 percentile traffic volume in each year was also used to confirm the result estimated by Drake's formula. Checking changes of capacity on several sections, it seems that traffic capacity on most sections has been declining in the last ten years.

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