Comparative Analysis of Critical Headway Estimation at Urban Single-Lane Roundabouts

Radović, Dunja; Mohan, Mithun; Bogdanović, Vuk

doi:10.7307/ptt.v34i2.3902

Cited by 3 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can lead to underestimation or overestimation of road capacity, which in turn can affect road safety and efficiency. D. Radovic et al (40) , in turn, estimated the critical interval for single-lane roundabouts using five methods: Logit, Harders, Ruff, maximum likelihood and Wu's method. To determine which of these methods provides the most realistic estimate of the critical interval, the field values of the capacity were compared with theoretical capacity values.…”

Section: Discussionmentioning

confidence: 99%

Variable’s prediction of gap acceptance roundabout capacity model – Critical gap

Majid,

Ali

2023

Innovaciencia

View full text Add to dashboard Cite

Introduction: The research relevance is determined by the assessment of the capacity of roundabouts and their efficiency are extremely important topics in transport engineering research. As road networks are constantly growing in size and complexity, congestion and insufficient flow capacity are becoming serious problems for traffic. The research aims to determine the critical interval at a certain roundabout using several statistical methods and to compare the results obtained by each of them, respectively. Material and Methods: The statistical methods used in the study included the Ruff, Wu, Troutbeck, Ashworth, and standard deviation methods. Results and Discussion: The results of the study show that the difference between the five methods is minimal, although each method has its characteristics. The analysis of the critical interval for the left and right bands showed that different methods may vary in their estimates, but the overall picture remains within acceptable convergence. The difference between the Wu method and the other methods was found to be negligible, except for the Ashworth method, which has a significant difference in the definition of the critical interval. Conclusion: Thus, all five methods can generally be used to calculate the critical interval at roundabouts. However, due to its simplicity and reliability, the Wu method was recommended for use. The practical significance of the study is that the results provide important guidance and information for the design and management of roundabouts. Estimation of the critical spacing is key to determining the optimal traffic flow regime, which affects safety, flow capacity and convenience for drivers.

show abstract

Section: Discussionmentioning

confidence: 99%

Variable’s prediction of gap acceptance roundabout capacity model – Critical gap

Majid,

Ali

2023

Innovaciencia

View full text Add to dashboard Cite

show abstract

“…P is the probability of gap acceptance, β 0 and β 1 are regression coefficients and x is the length of the gap. Authors in [69] described the application of this model for five singlelane four-leg mini-roundabouts. The required geometric and traffic parameters of the roundabouts have been obtained using the so-called photographic method, which employs videos.…”

Section: Gap Acceptance Modelsmentioning

confidence: 99%

Roundabouts: Traffic Simulations of Connected and Automated Vehicles—A State of the Art

Campi,

Mastinu,

Previati

et al. 2024

IEEE Trans. Intell. Transport. Syst.

View full text Add to dashboard Cite

The paper deals with traffic simulation within roundabouts when both "connected and automated vehicles" (CAVs) and human-driven cars are present. The aim is to present the past, current and future research on CAVs running into roundabouts within the Cooperative, Connected and Automated Mobility (CCAM) framework. Both microscopic traffic simulations and virtual reality simulations by dynamic driving simulators will be considered. The paper is divided into five parts. At first, the literature is analysed using the Systematic Literature Review (SLR) methodology based on Scopus database. Secondly, the influence of CAVs on roundabout-specific design features and configuration is analysed. Gap-acceptance models used to define the capacity of the roundabout, one of its most important key performance indicators, are also presented. Third, the most common simulation software are described and analysed in terms of traffic demand implementation. Then the communication approaches and path management algorithms are studied. An example is proposed on the integration of microscopic traffic simulations and dynamic driving simulators virtual reality simulations. Finally, car following models suitable for roundabout traffic are discussed. There is still a gap between simulations and actual experience. There are reasonable doubts on how modelling and optimizing CAVs' behaviour into roundabouts in view of CCAM. It seems that Cooperative, Connected and Automated Vehicles (CCAVs), more than simply Connected and Automated Vehicles (CAVs), could optimise traffic flow, safety and driving comfort within the roundabout. A very promising technology for traffic simulation within the roundabout seems the one based on dynamic driving simulators.

show abstract

Roundabout with a strong U-Turn traffic

Lobază

2022

Romanian Journal of Transport Infrastructure

View full text Add to dashboard Cite

The traffic capacity of a roundabout depends very much on the existing traffic volumes on each approach, each direction of travel having an impact on the other movements in the intersection, especially on those with which it conflicts. Roundabouts where the turning maneuver has significant values, such as roads / streets where the left turn is allowed at long distances, substantially influence the capacity of the approach with which it intersects. This maneuver includes calculating delays and vehicle queues at all other arms, resulting in a reduction in their capacity and, ultimately, in the entire intersection. As can be seen from the results of the analyzed roundabout, U-turn (which replaces the left turn movement) produces a significant increase in delays on the rest of the approaches, thus preventing further development of the community.

show abstract

Comparative Analysis of Critical Headway Estimation at Urban Single-Lane Roundabouts

Cited by 3 publications

References 22 publications

Variable’s prediction of gap acceptance roundabout capacity model – Critical gap

Variable’s prediction of gap acceptance roundabout capacity model – Critical gap

Roundabouts: Traffic Simulations of Connected and Automated Vehicles—A State of the Art

Roundabout with a strong U-Turn traffic

Contact Info

Product

Resources

About