Turbo Roundabout Usage in Lieu of Conventional Roundabouts for the Jordanian Traffic Conditions

Khasawneh, Mohammad Ali; Alsaleh, Nael

doi:10.1007/s40999-018-0330-z

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…They investigated six scenarios by varying directional traffic flows and their vehicle composition for evaluating the simulated safety outcomes. Khasawneh and Alsaleh (2018) studied the possibility of upgrading at-grade roundabouts to turbo-roundabouts considering the Jordanian driving conditions, and how such upgrade could affect the selected performance measures: safety, capacity, queue length, delay, and level of service. The authors selected and analyzed three roundabouts using SIDRA software under off-peak and peak traffic conditions to estimate capacity, queue length, delay, and level of service under the existing design.…”

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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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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“…The authors concluded that MUT and the superstreet do not perform at their best in congested areas (Hadidi et al, 2022). The very few studies related to the implementation of UAIDs in Jordan agree that they have the ability to improve traffic operations (Alsaleh and Shbeeb, 2018;Hadidi et al, 2022;Khasawneh and Alsaleh, 2018;Naghawi et al, 2018a;2018b). Even though all of these studies compared the performance of UAIDs using delay, travel time, queue length, number of stops, and travel speed.…”

Section: Introductionmentioning

confidence: 99%

The Feasibility and Operational Performance of Implementation Median U-turn Intersections: A CRITIC Method

Alhadidi,

Matarneh,

Abu Tahoon

2024

Period. Polytech. Transp. Eng.

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Currently, a growing number of cities are adopting the Median-U-Turn (MUT) intersection design to enhance road capacity and traffic efficiency. The critical question in selecting the right intersection design is how significantly the implementation of MUT can enhance intersection performance, focusing on three key aspects: intersection efficiency, capacity, and the environmental impact of the design. To address this question, an evaluation of operational performance under various prevailing conditions (roadway and control) was conducted using VISSIM, a microscopic simulation platform. This evaluation involved five scenarios: conventional intersections (with increased cycle length, grade separation with a signalized at-grade intersection, grade separation with a roundabout), MUT, and signalized crossover MUT at a dense urban arterial intersection in Amman, Jordan's capital. The performance was compared using several metrics: average control delay, number of stops, average travel speed and time, average stopped delay, Carbon Monoxide (CO) emissions, fuel consumption, and vehicle safety. The Criteria Importance Through Intercriteria Correlation (CRITIC) technique was subsequently used to select the optimal design. The findings indicate that the existing intersection configuration is the least effective, while the MUT with signals at the crossing U-turn points is the most efficient solution.

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A comparative analysis of the performance of turbo roundabouts based on geometric characteristics and traffic scenarios

Dabiri

Aghayan

Hadadi

2020

Transportation Letters

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Turbo Roundabout Usage in Lieu of Conventional Roundabouts for the Jordanian Traffic Conditions

Cited by 3 publications

References 8 publications

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

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

The Feasibility and Operational Performance of Implementation Median U-turn Intersections: A CRITIC Method

A comparative analysis of the performance of turbo roundabouts based on geometric characteristics and traffic scenarios

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