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Evaluating the Operational Efficiency of Two Versions of Super Diverging Diamond Interchange Design: A Case Study in Denver, Colorado
Transportation Research Record: Journal of the Transportation Research Board ( IF 1.7 ) Pub Date : 2021-09-07 , DOI: 10.1177/03611981211037241
Muhammad Tahmidul Haq 1 , Amirarsalan Mehrara Molan 2 , Khaled Ksaibati 1
Affiliation  

This paper aims to advance the current research on the new super diverging diamond interchange (super DDI) design by evaluating the operational efficiency using real-world locations. As part of a comprehensive research effort on improving the performance of failing service interchanges in the mountain-plains region, the study identified three interchanges (Interstate 225 and Mississippi Avenue, Interstate 25 and 120th Avenue, and Interstate 25 and Hampden Avenue) at Denver, Colorado as the potential candidates to model for future retrofit. Four interchange designs (i.e., existing CDI [conventional diamond interchange], DDI, super DDI-1, and super DDI-2) were tested in this study. The operational analysis was conducted using VISSIM and Synchro. Several microsimulation models (120 scenarios with 600 runs in total) were created with three peak hours (a.m., noon, and p.m.) for existing (the year 2020) and projected (the year 2030) traffic volumes. The study considered two simulation networks: (1) when no adjacent traffic signal exists, to determine how the four interchange designs would perform if there were no adjacent signals or they were far away from the interchange; and (2) when there are two adjacent traffic signals, to evaluate the performance of the four interchanges in a bigger corridor with signal coordination needed. An important finding is that super DDI designs outperformed DDI with adjacent signals and higher traffic demand, while DDI performed similarly to or sometimes insignificantly better than super DDI if no adjacent intersections were located in the vicinity and if the demand was lower than the DDI’s capacity.



中文翻译:

评估两个版本的超发散钻石立交桥设计的运营效率:科罗拉多州丹佛市的案例研究

本文旨在通过使用真实世界位置评估运营效率来推进对新的超级分流钻石立交 (super DDI) 设计的当前研究。作为改善山区平原地区故障服务交汇处性能的综合研究工作的一部分,该研究确定了丹佛的三个交汇处(225 号州际公路和密西西比大道、25 号州际公路和 120 大道,以及 25 号州际公路和汉普登大道),科罗拉多州作为未来改造建模的潜在候选者。本研究测试了四种立交桥设计(即现有的 CDI [常规菱形立交桥]、DDI、超级 DDI-1 和超级 DDI-2)。使用 VISSIM 和 Synchro 进行操作分析。针对现有(2020 年)和预计(2030 年)交通量,针对三个高峰时段(上午、中午和下午)创建了多个微观模拟模型(120 个场景,总共 600 次运行)。该研究考虑了两个模拟网络:(1) 当不存在相邻交通信号时,确定四个立交设计在没有相邻信号或远离立交的情况下的表现;(2) 当有两个相邻的交通信号时,在需要信号协调的较大走廊中评估四个立交的性能。一个重要的发现是,超级 DDI 设计在相邻信号和更高流量需求下的性能优于 DDI,

更新日期:2021-09-07
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