Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics), Vol. 72, No. 2, I_1-I_13, 2016. ANALYSIS ON CAR COMMUTERS’ BEHAVIOR DURING A MASSIVE DOWNPOUR BASED ON PROBE DATA AND QUESTIONNAIRE SURVEY Mohammad Hannan Mahmud KHAN1, Motohiro FUJITA2 and Wisinee WISETJINDAWAT3 1Student member of JSCE, Graduate Student, Dept. of Civil Eng., Nagoya Institute of Technology (Gokiso, Showa, Nagoya 466-8555, Japan) E-mail:
[email protected] 2 Member of JSCE, Professor, Dept. of Civil Eng., Nagoya Institute of Technology (Gokiso, Showa, Nagoya 466-8555, Japan) E-mail:
[email protected] 3 Member of JSCE, Assistant Prof., Dept. of Civil Eng., Nagoya Institute of Technology (Gokiso, Showa, Nagoya 466-8555, Japan) E-mail:
[email protected] A massive downpour due to Typhoon Roke attacked the Tokai region on 20th September, 2011. Several roads in the northeastern part of Nagoya city and the adjacent areas were closed to traffic, resulting in a serious commuter chaos. In this research, we attempted to explore the effects of departure hours, early or late departure, the significance of acquiring proper traffic information as well as the impacts of road closures on the level of difficulty of home returning trips. Regression models were developed using both questionnaire survey and taxi probe data. Questionnaire survey can gather drivers’ information; however, it is difficult to gather the actual changes in travel condition. On the other hand, probe data can demonstrate a real time change in travel condition at every couple of minutes. Therefore, this study presents a combined usage of both data for a clearer explanation on the travel condition and the behavior of drivers during the typhoon.