Critical Gap Comparison between One-, Two-, and Three-Lane Roundabouts in Qatar
Khaled Shaaban,Hassan Hamad +1 more
TLDR
The purpose of this study is to measure and compare the critical gap values for different types of roundabouts in Qatar and to understand the difference in operation between them.Abstract:
A critical gap value of a roundabout is mainly affected by the interactions between the circulating vehicles and vehicles entering the roundabout. These interactions are impacted by many factors, including the number of circulating lanes, the aggressiveness of local drivers, vehicle types, and the number of approaching lanes. Therefore, it is essential to locally investigate critical gap values before conducting any studies to improve capacity and delay at roundabouts. The purpose of this study is to measure and compare the critical gap values for different types of roundabouts in Qatar. More than 10,000 measurements were collected. The results showed that the critical gap values were 2.24 s, 2.55 s, and 2.40 s for the one-, two-, and three-lane roundabouts, respectively. These values are also quite low when compared to values calculated in other countries, which can be an indication of driver aggressiveness and risky behavior. The study is one of the first efforts to compare three types of roundabouts and to understand the difference in operation between them in this region. The results of this study can help engineers, planners, and public agencies to plan, study, and design similar facilities.read more
Citations
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Useful estimation procedures for critial gaps.
TL;DR: In this paper, the authors give an overview of some of the more important methods for the estimation of crtical gaps at unsignalized intersections, including the maximum likelihood procedure and the method developed by Hewitt.
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Hamsa Abbas Zubaidi,Hamsa Abbas Zubaidi,Ihsan Ali Obaid,Ihsan Ali Obaid,Ali Alnedawi,Subasish Das +5 more
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TL;DR: In this paper , equivalent hourly traffic noise levels at different intersections in the city of Doha, Qatar were measured and compared to the local and World Health Organization (WHO) thresholds.
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Challenges and Lessons Learned from Building a New Road Drainage System in a Developing Country
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References
More filters
Useful estimation procedures for critical gaps
TL;DR: In this paper, the authors give an overview of some of the more important methods for the estimation of crtical gaps at unsignalized intersections, including the maximum likelihood procedure and the method developed by Hewitt.
Journal ArticleDOI
Useful estimation procedures for critical gaps
TL;DR: An overview of some of the more important methods for the estimation of crtical gaps at unsignalized intersections is given and the maximum likelihood procedure and the method developed by Hewitt can be recommended for practical application.
Journal ArticleDOI
Critical Gap as a Function of Waiting Time in Determining Roundabout Capacity
TL;DR: In this article, the impact of the waiting time of drivers on the approach leg, on the critical gap they accept before entering a roundabout and the entry capacity of the approach was studied.
Journal ArticleDOI
Driver Behavior and Gap-Acceptance Characteristics at Roundabouts in California:
TL;DR: In this article, the authors present the results of critical headway and follow-up headway measurements at seven single-lane and three multilane roundabouts in California and reveal that circulating flow rate and speed are two major factors affecting critical and follow up headway.
Journal ArticleDOI
Evaluation of Roundabout Performance Using SIDRA
Virginia P Sisiopiku,Heung-Un Oh +1 more
TL;DR: This study provides recommendations to traffic engineers on the conditions under which roundabouts perform better than controlled intersections and, thus, should be considered as design alternatives.
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