2018 Fiscal Year Final Research Report
Research on vehicle behaviors and performance evaluation according to the roundabout geometry
| Project/Area Number |
16H04426
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil engineering project/Traffic engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
後藤 梓 名古屋大学, 環境学研究科, 助教 (00748460)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | ラウンドアバウト / 幾何構造 / 交通容量 / 安全性 / 性能評価 / リスク指標 / 乗用車換算係数 |
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| Outline of Final Research Achievements |
The objective of this research is to develop an estimation method of entry capacity, vehicle trajectories and speeds according to the geometry of roundabout, and to propose a performance evaluation method related to safety and efficiency at the design stage. As a result of estimating the entry capacity and PCE according to the geometric element by using the entry capacity estimation formula and a micro traffic simulator, it was found that the entry capacity changes with the geometric element and the inscribed circle diameter and the entry width of the roundabout significantly affects it. As a safety performance evaluation index, a risk index was proposed, which is represented by the product of the oversight probability that indicates the likelihood of an accident and the collision intensity that indicates the severity of the accident. Then, its modeling was performed to calculate the risk index from any geometric conditions.
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| Free Research Field |
交通工学
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| Academic Significance and Societal Importance of the Research Achievements |
従来一定値が用いられてきたラウンドアバウトにおける大型車の乗用車換算係数が幾何構造により変化することを明らかにしたことで，幾何構造条件に応じた大型車を考慮した交通容量の推定が可能となった．また，設計段階において幾何構造条件を入力することで，計画するラウンドアバウトの安全性能を定量評価することが可能となった．これらの成果は有用な手法を与えるものであり，実務上の意義も高く，社会に貢献するものである．
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