Development of a safety performance evaluation tool for roundabout geometric design

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15118
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22050:Civil engineering plan and transportation engineering-related
• Research Institution: Nihon University
• Principal Investigator: YOSHIOKA Keisuke 日本大学, 理工学部, 助教 (30755541)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ラウンドアバウト / 幾何構造 / 安全性能 / 設計 / リスク

Outline of Final Research Achievements

Driving behavior survey by the unmanned aerial vehicle at three roundabouts and modeling to estimate driving behavior based on the geometric conditions of the roundabout are conducted. A risk index accounting for both the likelihood of collision and the severity of collision was proposed and calculated based on the driving behavior model. Furthermore, sensitivity analysis and formulation of the relationship between the risk index and geometric conditions were conducted, and a prototype evaluation form was developed in which the risk index is calculated by inputting the geometric conditions.

Free Research Field

交通工学

Academic Significance and Societal Importance of the Research Achievements

一般的に交差点の安全性能は、事故データ等の統計データに基づいて分析されるが、本研究で提案する評価指標は、幾何構造条件のみから安全性能を客観的に評価するものである。安全性能の評価指標として、衝突の起きやすさと、仮に衝突したときの重度を危害の程度の両方を考慮したリスク指標を提案し、これを幾何構造条件から推定するための定式化をした。
この評価手法は、実際の事故データとの関係性については課題が残るものの、実務の幾何構造設計における評価や判断基準の根拠になり得るものと考えられる。