JSTE Journal of Traffic Engineering
Online ISSN : 2187-2929
ISSN-L : 2187-2929
Special Edition A (Research Paper)
Analysis of the impact of traffic accidents on the MFD shape
Toshio YOSHIIRui OKUHARATakahiro TSUBOTA
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2021 Volume 7 Issue 2 Pages A_201-A_206

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Abstract

Once a traffic accident causes a traffic obstruction, the effect extends not only to the vicinity of the accident site but also to the surrounding roads, resulting in the deterioration in road function on a network scale. The purpose of this study is to clarify that the effect of traffic accident on the deterioration in the network-wide traffic states, targeting the road network in Matsuyama City, Ehime Prefecture. Specifically, we analyze the change in shapes of the Macroscopic Fundamental Diagram ("MFD") after the occurrence of the accident. The trajectory data from the ETC2.0 probe vehicles is utilized in estimating the MFD. The network traffic states are represented by the network-wide traffic flow and density by ETC2.0 probes. Considering that the number of the equipped vehicles is increasing over time, these data is normalized by the monthly average of flow and density. As a result of estimating the MFD with and without the occurrence of traffic accidents, it was observed that there was a significant difference in the shape of the MFD due to the influence of the accident.

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© 2021 Japan Society of Traffic Engineers
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