Journal of Korean Society of Transportation ISSN:1229-1366(Print) 2234-4217(Online) 대한교통학회지

In many of the existing studies, transit accessibility may be measured by an intuitive indicator that is the length of time it takes to reach a public transport station. This, however, does not reflect changes in the access environment attributes with the passage of time, thus deemed difficult to indicate the actual level of access, which alters depending on what time it is during the day. This study is designed to propose that transit accessibility changes depending on the time of day with the data of measured accessibility, and as a way to realize the purpose it adopted dynamic accessibility, which was based on the following three core elements: people, traffic, and activity. Dynamic accessibility presented in this study refers to an accessibility index that considers the effects of population, traffic conditions, and activity destinations by combining mobile data-based active population and activity place operation time data with travel time. In order to carry out a comparative analysis between dynamic accessibility estimated in this study and the static accessibility, Seoul was sectionalized into 424 dongs (primary division of administrative districts called gu) and operating pharmacies in the city were designated as a venue of social activities. In the process, the data on activities at those pharmacies per time of day and on the de facto population of Seoul, categorized per time of day and per dong were employed, and the shortest route from the origin to the destination was estimated based on the Python-based web crawling for the analysis. As a result, it turns out that accessibility became lower during the hours when availability of public transit and pharmacies was limited, and the operating hours of pharmacies, an indicator to express the level of activities among the classification factors, were found as an important factor to show differences on access time. Moreover, it was investigated that dynamic accessibility is represented only in the time zone in which most pharmacies are operating, and that there is a difference between static accessibility and dynamic accessibility in other time zones.