AN ANALYSIS ON ENTRY CAPACITY AND OBSERVED MAXIMUM TRAFFIC FLOWS AT ROUNDABOUTS IN JAPAN

DOI Web Site Open Access
  • KANBE Nobuto
    株式会社オリエンタルコンサルタンツ 関西支店
  • ODAKA Shinji
    株式会社オリエンタルコンサルタンツ 関西支店
  • KANG Nan
    東京理科大学 理工学部 土木工学科
  • NAKAMURA Hideki
    名古屋大学大学院 環境学研究科 都市環境学専攻
  • MORITA Hirohisa
    日本大学 理工学部 交通システム学科

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Other Title
  • 日本におけるラウンドアバウトの実測最大交通量と交通容量の分析

Description

In recent years, field operational tests and implementation of roundabout are actively promoted at several places in Japan, and roundabout has been legally positioned through the amendment of the Road Traffic Act in June 2013. Entry capacity is one of the most important indices for performance evaluation related to the application of roundabouts. However, a criterion of entry capacity including impacts of pedestrians and cyclists based on the observation has not been available in Japan due to the limited observation examples. This paper aims to analyze characteristics of roundabout entry traffic flows based on the field data observed at several existing and/or experimental roundabouts. Entry capacity observed at Roppontsuji roundabout in Karuizawa Town is also examined and compared with the estimated values by a proposed entry capacity estimation model.

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