Safety and Efficiency Analysis of Turbo Roundabout with Simulations Based on the Lujiazui Roundabout in Shanghai

Liu, Qiujia; Deng, Jiali; Shen, Yifan; Wang, Wenxin; Zhang, Zhan; Lu, Linjun

doi:10.3390/su12187479

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…Chenwei and Xiaodan (2017) Izadi et al (2016); Dabiri et al (2020) assert that when conventional and turbo roundabouts are compared to conventional roundabouts in different scenarios with respect to performance of delay time, capacity and level of service, in case that the diameter of the four-leg turbo roundabout is increased, the performance of the conventional roundabout decreases but the performance of the three-leg turbo roundabout increases. Liu et al, (2020) conclude that when turbo roundabouts with different central island diameters are designed, the performance of the roundabout can change according to the number of legs. Also, in a study carried out by Elhassy et al (2020) in Doha, a city of Qatar, three modified versions of rotor turbo roundabouts were designed and compared to the conventional roundabout in terms of capacity, queuing, delay time.…”

Section: Alternative Roundabout Types and Their Comparisonmentioning

confidence: 94%

Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

User

İlyas²,

Tınaztepe

2021

BJRBE

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Roundabouts are one of the safest types of intersections. There are a number of roundabout types in literature. Each roundabout type is distinguished by some characteristics. To design more efficient junctions, hybrid roundabouts can be created by combining their required characteristics geometrically. In this study, the safety feature of the turbo junction type and the easing up the traffic density feature of the hamburger junction have been combined. Some geometric parameters and layout details of the proposed hybrid roundabout are given, and its performance was simulated in a signalised 4-leg roundabout as the most frequently used intersection in Antalya. The performance of the proposed hybrid roundabout was compared with the status in 2016 and the current status in 2017 and beyond of the roundabout through AIMSUN transport simulation software. In regard to performance analysis, delay time, travel time, speed, density, fuel consumption, number of stops, queuing, carbon emission were analysed for all statuses and compared. In addition, traffic safety analysis has been performed for all statuses and compared. Results show that the overall average performance of the proposed roundabout increases by 40% and 41.8% in comparison with the statutes in 2016, 2017 and beyond, respectively. The proposed roundabout is 41% safer than the status in 2016, and the accident risk is lower by 18.5% than the current status.

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Section: Alternative Roundabout Types and Their Comparisonmentioning

confidence: 94%

Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

User

İlyas²,

Tınaztepe

2021

BJRBE

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“…Therefore, using the CSI index to evaluate the collision's severity is also necessary. TTC and Max-delta V are collision-related indexes, and based on their relationship, the CSI index can be calculated as shown in (7) [54].…”

Section: Safety Evaluation 451 Selection Of Evaluation Indexesmentioning

confidence: 99%

Research on Efficient Operation for Compound Interchange in China from an Auxiliary Lanes Configuration Aspect

Tian,

Shi,

Yang

et al. 2023

Applied Sciences

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Interchanges are the key nodes of the freeway. Due to the existence of weaving behavior, the traffic flow situation is more complicated for small spacing interchanges. Continuous auxiliary lanes are usually used to connect the entrance and exit to form a compound interchange to reduce the interference of weaving behavior. However, when it comes to the design of auxiliary lane forms, China lacks relevant design specifications and research in this area. As a result, there often exists the phenomenon of mismatch between the design form and the traffic volume. In this paper, we took a compound interchange in Xi’an as the research object, proposing four auxiliary lane design schemes and using VISSIM (2022 student) software to establish the simulation model. Additionally, various traffic conditions were simulated through sensitivity analysis. Finally, using the factor analysis method and entropy method, we comprehensively assigned weights to the indexes. By obtaining the weighted scores for various schemes, it became possible to determine the applicability of each scheme under different traffic conditions. The results indicate that the gradient auxiliary lane can be applied to most traffic conditions and has a smaller land occupation than the traditional design, which is an optimization and improvement for the traditional design form.

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“…Their results showed that the capacity of the conventional three-lane roundabout was higher than the capacity of the turbo-roundabouts, concluding that turbo-roundabouts are not suitable for intersections with traffic volumes exceeding 4500 vehicles per hour. Liu et al (2020) evaluated the safety and traffic performance of turboroundabouts for a five-branch roundabout in Shanghai. The authors built VISSIM models for the roundabout and the proposed turbo-roundabout, performing several tests under diverse traffic volumes and central island radius.…”

Section: Background Researchmentioning

confidence: 99%

Complete-Linkage Clustering Analysis of Surrogate Measures for Road Safety Assessment in Roundabouts

Bulla-Cruz

Lyons

Darghan

2021

Rev. colomb. estad.

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This paper presents the findings of a comparative road safety assessment between an existing two-lane roundabout and proposed basic turboroundabout, both designed for the same intersection, to determine which one is safer, based on traffic conflicts and surrogate safety measures. We performed microsimulation models in VISSIM to replicate the fieldobserved traffic operation, and the SSAM to determinate six surrogate measures. We validated the consistency of values obtained by several statistical analyzes. The number of conflicts was 72% lower at the turboroundabout. Through a complete-linkage clustering analysis and Euclidean distances of the surrogate measures, we found that traffic conflicts at the turbo-roundabout tend to cluster in a group, whereas conflicts at the roundabout are scattered, suggesting better organization of traffic flows at the turbo-roundabout. Three-dimensional graphical analysis of clusters and its centroids allowed verifying that surrogate measures point out a safer operation at the turbo-roundabout, even though it presented higher operating speeds. Reducing the dimensionality by principal components analysis, the cumulative variance for the first two components (87.72%) allowed observing results on a two-dimensional graph and their clusters. To endorse conflicts classification, resulting of clusters, we used discriminant analysis. Results validate the methodology and the safety benefits of the turbo-roundabout.

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Safety and Efficiency Analysis of Turbo Roundabout with Simulations Based on the Lujiazui Roundabout in Shanghai

Cited by 16 publications

References 28 publications

Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

Research on Efficient Operation for Compound Interchange in China from an Auxiliary Lanes Configuration Aspect

Complete-Linkage Clustering Analysis of Surrogate Measures for Road Safety Assessment in Roundabouts

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