ANALYSIS OF ROAD PERFORMANCE AND TRAFFIC DEMAND VARIATIONS BY THE SEASONS

摘要

This paper investigates variations of road performance and traffic demand by the seasons onrnurban expressway. Authors have been analysing the influence of several external factors suchrnas time of a day, day of a week, weather and commercial custom onto fluctuations of roadrnperformance and traffic demand in the former study (1). And it was concluded that all thernfactors except commercial custom have a big influence onto the performance and demand.rnThe season is considered as a new external factor in this study. Travel time obtained byrnautomatic license plate detector is used for grasping the road performance and its variation.rnThe path flows estimated by a dynamic path flow estimation model are used as a trafficrndemand. For clarifying the reason of the road performance degradation, the relationshiprnbetween the performance and the demand is analysed utilising cluster analysis. It is found thatrnthe season is one of the most important external factors on the variations of performance andrndemand.