Capacity of Single-Lane Roundabouts with Slow Traffic

Leeuw, Martijn A. M. de; Botma, H; Bovy, Piet H. L.

doi:10.3141/1678-08

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…Differences in geometric characteristics lead to different operating characteristics on single and double lane roundabouts, leading to their capacities usually being analyzed separately [ 7 – 11 ]. Selecting the four-leg roundabout as the research object in this paper, the correlation between the entry flow and the circulating flow is analyzed for the single and double lane roundabouts, respectively.…”

Section: Traffic Operations Analysis At Roundaboutsmentioning

confidence: 99%

Capacity and Delay Estimation for Roundabouts Using Conflict Theory

Duan

et al. 2014

The Scientific World Journal

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To estimate the capacity of roundabouts more accurately, the priority rank of each stream is determined through the classification technique given in the Highway Capacity Manual 2010 (HCM2010), which is based on macroscopical analysis of the relationship between entry flow and circulating flow. Then a conflict matrix is established using the additive conflict flow method and by considering the impacts of traffic characteristics and limited priority with high volume. Correspondingly, the conflict relationships of streams are built using probability theory. Furthermore, the entry capacity model of roundabouts is built, and sensitivity analysis is conducted on the model parameters. Finally, the entrance delay model is derived using queuing theory, and the proposed capacity model is compared with the model proposed by Wu and that in the HCM2010. The results show that the capacity calculated by the proposed model is lower than the others for an A-type roundabout, while it is basically consistent with the estimated values from HCM2010 for a B-type roundabout.

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Section: Traffic Operations Analysis At Roundaboutsmentioning

confidence: 99%

Capacity and Delay Estimation for Roundabouts Using Conflict Theory

Duan

et al. 2014

The Scientific World Journal

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“…Plus le nombre de piétons traversant les approches augmente, moins les véhicu-les circulant sur l'anneau parviennent aisément à entrer ou à sortir du giratoire (Brilon et Vandehey 1998;Boender 1999). De la même façon, les véhicules exceptionnellement longs et les cyclistes, lorsqu'ils sont en nombre important, limitent la capacité du giratoire à cause de leur lenteur relative (de Leeuw et al 1999). Les guides présentent, à ce propos, des abaques afin de quantifier l'influence de ces usagers sur la capacité de l'intersection (Robinson et al 2000).…”

Section: Capacitéunclassified

Dernières avancées sur les carrefours giratoires

Pellecuer

St-Jacques

2008

Can. J. Civ. Eng.

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Le carrefour giratoire est un aménagement routier qui a connu un fort succès au cours des années 1970 et est désormais pratique courante en Europe grâce à ses performances en termes de capacité et de sécurité. Néanmoins, ce concept d'ingénierie est d'usage beaucoup moins répandu dans le reste du monde et, notamment, en Amérique du Nord où la population reste circonspecte à son propos. Pourtant, lors de mises en application, les préjugés négatifs se transforment rapidement en opinion favorable. De plus, lorsque l'implantation est précédée d'une planification et d'une conception minutieuses, accompagnée d'une campagne de communication efficace, le carrefour giratoire peut être adapté à l'environnement et aux conducteurs nord-américains. De nombreux guides proposent un cadre pour la conception des carrefours giratoires, mais il n'existe pas encore de normes établies. Les efforts de recherche actuels visent à mieux comprendre le fonctionnement de ces aménagements routiers afin de pouvoir tirer des règles de conception plus efficaces et pertinentes. Abstract:A roundabout is a street design that experienced great success in the 1970s and is now common practice in Europe because of its performance in terms of capacity and safety. Nevertheless, this engineering design is much less used in the rest of the world, especially in North America, where the population is still reluctant to adopt it. However, when it is implemented, negative preconceptions are rapidly transformed to favourable opinions. Moreover, with careful planning and design, coupled with an efficient communication campaign, the roundabout can be adapted to the North American environment and drivers. Several guides propose a design framework for roundabouts, but there are no set standards. Current research efforts in understanding the operation of these street designs are aimed at establishing more relevant and effective design rules.

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“…Until recently, there was no satisfactory method available in the Netherlands to weigh one intersection type against another (de Leeuw et al, 1999). Also, there is only one capacity calculation method in the Netherlands that takes into account the influence of bicyclists on capacity (Van Arem and Traag, 1992).…”

Section: Netherlands Modelsmentioning

confidence: 99%

“…The formula assumes random arrivals of slow traffic. This seems to be a realistic assumption, because in general, slow traffic does not platoon as much as motor vehicles (de Leeuw et al, 1999). The chance that the entry is not blocked by crossing bicyclists (P,,tr) is: Bicycle Path -The capacity increase caused by the extra space between bicycle path and roundabout can be modeled using a model of Brilon (1995), describing the process at two-stage priority intersections.…”

Section: Netherlands Modelsmentioning

confidence: 99%

“…As the influence of bicyclists on capacity cannot be ignored in the Netherlands, de Leeuw et al (1999) carried out the development of a new capacity model that takes into account the influence of bicyclists, and provides more accurate results than the previous model. The main purpose of the new model is to estimate capacity and average delay per entry.…”

Section: Netherlands Modelsmentioning

confidence: 99%

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A computer simulation model for single-lane roundabouts

Elbadrawi¹

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Elbadrawi, Hesham Roshdy, "A computer simulation model for single-lane roundabouts" (2000). Roundabouts are often chosen because they are widely associated with low accident rates, lower construction and operating costs, and reasonable capacities and delay.In the planning and design of roundabouts, special attention should be given to the movement of pedestrians and bicycles. As a result, there are several guidelines for the design of pedestrian and bicycle treatments at roundabouts that increase the safety of both pedestrians and bicyclists at existing and proposed roundabout locations. Different design guidelines have differing criteria for handling pedestrians and bicyclists at roundabout locations.Although all of the investigated guidelines provide better safety (depending on the traffic conditions at a specific location), their effects on the performance of the roundabout have not been examined yet.vii Existing roundabout analysis software packages provide estimates of capacity and performance characteristics. This includes characteristics such as delay, queue lengths, stop rates, effects of heavy vehicles, crash frequencies, and geometric delays, as well as fuel consumption, pollutant emissions and operating costs for roundabouts. None of these software packages, however, are capable of determining the effects of various pedestrian crossing locations, nor the effect of different bicycle treatments on the performance of roundabouts.The objective of this research is to develop simulation models capable of determining the The results of this effort show that installing a pedestrian crossing on the roundabout approach will have a negative impact on the entry flow, while the downstream approach will benefit from the newly created gaps by pedestrians. Also, it was concluded that a bicycle lane configuration is more beneficial for all users of the roundabout instead of the mixed flow or combined crossing. Installing the pedestrian crossing at one-car length is more viii beneficial for pedestrians than two-and three-car lengths. Finally, it was concluded that the effect of the pedestrian crossing on the vehicle queues diminishes as the distance between the crossing and the roundabout increases.ix

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Capacity of Single-Lane Roundabouts with Slow Traffic

Cited by 5 publications

References 3 publications

Capacity and Delay Estimation for Roundabouts Using Conflict Theory

Capacity and Delay Estimation for Roundabouts Using Conflict Theory

Dernières avancées sur les carrefours giratoires

A computer simulation model for single-lane roundabouts

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