Development of a Delay Model for Roundabouts in Jordan

Al-Omari, Bashar H.; Al‐Masaeid, Hashem R.; Al-Shawabkah, Y. S.

doi:10.1061/(asce)0733-947x(2004)130:1(76)

Cited by 26 publications

(17 citation statements)

References 7 publications

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“…Delay is always present at the roundabout because of the geometric design. The roundabout geometric design is one of the major factors that influence delay [3]. The value is usually small for a small roundabout, but large for a large diameter roundabout and it could be significant.…”

Section: Data Collectionmentioning

confidence: 99%

Anomalous Quality of Service Deterioration at Roundabouts Caused by Rainfall

Ben-Edigbe

Ibijola

2019

PROMET

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The paper investigated the extent to which rainfall influences the quality of service delivery at multilane roundabouts using a novel quality of service approach. Quality of service is defined as how well roundabouts operate based on road users and road providers’ perception of service quality. Delay and reserve capacity were used respectively as proxies for road users and road providers’ perception of service quality. The entry and circulating traffic data were recorded continuously for eight weeks under dry, light, moderate, and heavy rainfall weather conditions at each surveyed roundabout, then collated, analysed and compared. Linear regression with dummy variable was used to model the roundabout entry capacity and a corrector factor was added to modify the regression function. The corrector factor considered different entry radii and entry angles of surveyed roundabouts. Multi-criteria quality of service table with travel time as proxy for road users and speed as proxy for road providers’ perception of service delivery was developed from peak traffic data and used to determine the extent of deterioration. The multi-criteria table introduced in the paper is a clear departure from the speed-based criteria used in many studies. The results show a significant increase in time delay and a decrease in reserve capacity relative to rainfall. The paper has concluded that rainfall has an anomalous negative effect on the quality of service at multilane roundabouts. The findings could be used in a variety of ways in traffic management to predict the travel time at roundabouts under rainy conditions and to prescribe speed limits accordingly.

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Section: Data Collectionmentioning

confidence: 99%

Anomalous Quality of Service Deterioration at Roundabouts Caused by Rainfall

Ben-Edigbe

Ibijola

2019

PROMET

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“…Ainsi, de nombreuses études récentes font appel à cette méthode pour aborder différentes questions, telles que le rejet de gaz nocifs (Coelho et al 2006;Mandavilli et al 2008), les retards subis par les usagers (Al-Omari et al 2004), la capacité d'une intersection (Mereszczak et al 2005) ou la sécurité de certains usagers (Rouphail et al 2005).…”

Section: Modé Lisation Des Carrefours Giratoiresunclassified

“…Quelle que soit la méthode utilisée, il est clair que la capacité des giratoires est toujours déterminée non seulement par les caractéristiques du trafic et la géométrie de l'intersection, mais également par le comportement des usagers, lequel est lui-même fonction des règles de circulation, des traditions et des attitudes culturelles (Al-Omari et al 2004;Brilon 2005).…”

Section: Prévision De La 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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“…In [3], authors have focused their attention on roundabouts by manually analyzing offline 20 hours of tapes exploiting HCM2000 guidelines. Typically, in roundabouts the stopped delay varies greatly if considering time of day and traffic flow, since no traffic lights rule the flow.…”

Section: Previous Workmentioning

confidence: 99%

Real time detection of stopped vehicles in traffic scenes

Bevilacqua

Vaccari²

2007

2007 IEEE Conference on Advanced Video and Signal Based Surveillance

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Computer vision techniques are widely employed in Traffic Monitoring Systems (TMS) to automatically derive statistical information on traffic flow and trigger alarms on significant events. Research in this field embraces a wide range of methods developed to recognize moving objects and to infer their behavior. Tracking systems are used to reconstruct trajectories of moving objects detected often by using background difference approaches. Errors in either motion detection or tracking can perturb the position of the object centroids used to build the trajectories. To cope with the unavoidable errors, we have conceived a method to detect centers of non-motion through recognizing short stability intervals. These are further connected to build the long stability interval used to measure the overall vehicle stopping time. Extensive experiments also accomplished on the sequences provided by AVSS 2007 prove the effectiveness of our approach to measure the maximum stopped delay, even through a comparison with the ground truth.

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Development of a Delay Model for Roundabouts in Jordan

Cited by 26 publications

References 7 publications

Anomalous Quality of Service Deterioration at Roundabouts Caused by Rainfall

Anomalous Quality of Service Deterioration at Roundabouts Caused by Rainfall

Dernières avancées sur les carrefours giratoires

Real time detection of stopped vehicles in traffic scenes

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