Surrogate safety assessment of super DDI design: A case study in Denver, Colorado

IF 2.4 3区工程技术 Q3 TRANSPORTATION Journal of Transportation Safety & Security Pub Date : 2022-03-23 DOI:10.1080/19439962.2022.2054038

M. Haq, A. Molan, K. Ksaibati

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引用次数: 2

Abstract

Abstract This paper aims to advance the current research on the new super diverging diamond interchange (Super DDI) design by evaluating the safety performance of its two versions (super DDI-1 and super DDI-2) using real-field data. Three interchanges were selected in Denver metro, Colorado as the potential candidates to model for future retrofit. This study considered four interchange designs (i.e., existing diamond, DDI, super DDI-1, and super DDI-2) to assess the safety performance using the combination of VISSIM, Synchro, and SSAM analyzing tools. Several microsimulation models (120 scenarios with 600 runs in total) were created with three peak hours (AM, Noon, and PM) for existing (the year 2020) and projected (the year 2030) traffic volumes. Based on the results, both super DDI versions showed high potential in improving safety. As an important finding from this research, super DDI designs outperformed DDI when considering adjacent signals, while DDI performed apparently similar or sometimes even insignificantly better compared to super DDI if no adjacent intersections were located in the vicinity and if the demand was lower than DDI’s capacity.

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超级DDI设计的替代安全性评估:以科罗拉多州丹佛市为例

摘要:通过对超发散型金刚石立交(super DDI-1)和超发散型金刚石立交(super DDI-2)两个版本的安全性能进行实场数据评价，进一步推进了超发散型金刚石立交(super DDI)设计的研究进展。科罗拉多州丹佛市的三个立交桥被选为未来改造的潜在候选者。本研究考虑了四种立交设计(即现有钻石、DDI、超级DDI-1和超级DDI-2)，使用VISSIM、Synchro和SSAM分析工具组合评估安全性能。为现有(2020年)和预计(2030年)交通量创建了几个微观模拟模型(120个场景，总共运行600次)，其中包含三个高峰时段(上午、中午和下午)。结果表明，两种超级DDI版本在提高安全性方面具有很大的潜力。本研究的一个重要发现是，当考虑相邻信号时，超级DDI设计优于DDI，而当附近没有相邻交叉口且需求低于DDI的容量时，DDI的表现与超级DDI明显相似，有时甚至不明显。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Transportation Safety & Security TRANSPORTATION-

CiteScore

6.00

自引率

15.40%

发文量