ESTIMATION OF TRAFFIC STATE USING PROBE VEHICLES THAT EQUIPPED WITH SPACING MEASUREMENT DEVICES

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  • SEO Toru
    東京工業大学　大学院理工学研究科土木工学専攻
  • KUSAKABE Takahiko
    東京工業大学　大学院理工学研究科土木工学専攻
  • ASAKURA Yasuo
    東京工業大学　大学院理工学研究科土木工学専攻

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  • 車間距離を計測するプローブカーを前提とした交通状態の推定手法
  • クルマ カン キョリ オ ケイソク スル プローブカー オ ゼンテイ ト シタ コウツウ ジョウタイ ノ スイテイ シュホウ

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Eulerian observations such as traffic detectors are mainly used for observations of traffic state (flow rate, density, speed, etc.). However, implementing dense and wide-ranging Eulerian observations is almost impossible due to its installation and maintenance cost. On the other hand, Lagrangian observations such as GPS-equipped probe vehicles can observe entire road network with relatively low cost for road administrators. However, some of the traffic state factors such as flow rate are un-observable using only GPS-equipped probe vehicles. Recently, several devices that measure spacing data from cruising vehicles have been developed in automotive engineering field to enhance driving safety. These spacing data may be closely related to the traffic density, thus there is a possibility to estimate traffic state using such spacing measuring devices. This study assumes a new type of probe vehicle which observes its position and its spacing. An estimation method of traffic state solely depends on probe vehicles data is formulated. To validate the method performance, the numerical characteristics of the method are examined using a microscopic traffic simulator. As the results of the analysis, the developed method has a certain good estimation performance with fewer assumptions compared with conventional methods.

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