Turbo – Roundabouts and their Basic Evaluation at Realized Constructions in Czech Republic

Skvain, Vaclav; Petrů, Jan; Krivda, Vladislav

doi:10.1016/j.proeng.2017.05.339

Cited by 8 publications

(5 citation statements)

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“…The highest capacity levels in roundabouts can be achieved through the installation of traffic control devices. However, the above-mentioned measure does not permit to carry out the "self-regulation" principle which is the essential feature identifying this type of intersections [11].…”

Section: Literature Reviewmentioning

confidence: 99%

“…In comparison with traditional intersection types, the decrease in the potential conflict spots ranges between 38% and 66%, depending on the turbo roundabout arrangement. The turbo roundabout design, through conflict reduction, puts into effect the most effective criterion in terms of traffic safety at intersections [11]. Each additional conflict point is a contributing element to accident risk increase.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The average percentage of the accident rate reduction estimated for the selected intersections is 41%; the percentage can reach significant higher values in several locations (about 70%). The authors pointed out that safety benefits could be increased by the installation of lane dividers [11].…”

Section: Literature Reviewmentioning

confidence: 99%

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Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions?

2021

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The European Union policy strategies on the sustainability of the transport system pursue the goals of maximizing safety and environmental benefits and reducing the severity and frequency of crashes, congestion, and pollutant emission rates. A common issue is the planning of the most effective solution for operational and safety management at intersections. In this study, an egg turbo roundabout is proposed as the alternative solution to a conventional roundabout in Southern Italy which suffers from traffic congestion. A comparative analysis is carried out using microsimulation techniques to investigate the safety effects and operational improvements of converting a traditional priority intersection into standard roundabout or turbo roundabout layout. In particular, the VISSIM software is used to explore the most relevant operational performance measures: queue length, travel times and delays. The lowest values of these measurements are recorded for the simulated turbo roundabout, thus making this scheme more appropriate in terms of operational performances. With regard to safety analysis, the Surrogate Safety Assessment Model (SSAM) is used to collect information on the predicted number of conflicts, the probability, and severity of the potential collisions. The results suggest that, for the specific case study, the safety levels of the standard roundabout and the turbo roundabout are approximately comparable.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions?

2021

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“…In a study by Skvain et al (2017); Džambas et al (2017) it is seen that turbo roundabouts are more advantageous when traffic accident data and also capacity of the conventional types of intersections are transformed into the turbo roundabouts in the Czech Republic. Hatami and Aghayan (2017) conclude that an increase in the diameter of central island and speed limits has effects on delay time and capacity.…”

Section: Alternative Roundabout Types and Their Comparisonmentioning

confidence: 99%

Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

User

İlyas²,

Tınaztepe

2021

BJRBE

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Roundabouts are one of the safest types of intersections. There are a number of roundabout types in literature. Each roundabout type is distinguished by some characteristics. To design more efficient junctions, hybrid roundabouts can be created by combining their required characteristics geometrically. In this study, the safety feature of the turbo junction type and the easing up the traffic density feature of the hamburger junction have been combined. Some geometric parameters and layout details of the proposed hybrid roundabout are given, and its performance was simulated in a signalised 4-leg roundabout as the most frequently used intersection in Antalya. The performance of the proposed hybrid roundabout was compared with the status in 2016 and the current status in 2017 and beyond of the roundabout through AIMSUN transport simulation software. In regard to performance analysis, delay time, travel time, speed, density, fuel consumption, number of stops, queuing, carbon emission were analysed for all statuses and compared. In addition, traffic safety analysis has been performed for all statuses and compared. Results show that the overall average performance of the proposed roundabout increases by 40% and 41.8% in comparison with the statutes in 2016, 2017 and beyond, respectively. The proposed roundabout is 41% safer than the status in 2016, and the accident risk is lower by 18.5% than the current status.

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“…Babokic, Zagreb'te bulunan dört kollu sinyalizasyonlu bir kavşağın dönel ve turbo kavşak olarak düzenlemesi durumunda, mikro simülasyon yöntemleriyle yaptığı hesaplamalar sonucunda, turbo kavşak kollarında elde edilen kuyruk uzunluğu, taşıt gecikmesi, seyahat süresi ve emisyon yayılımı önemli oranda azaldığı görülmüştür [10].…”

Section: Introductionunclassified

Bingöl Düzağaç Kavşağının Rotor Tipi Turbo Dönel Kavşak Olarak Düzenlemesi Durumu için Kapasite Hesaplarının Ön Çalışması

Güzel

2021

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Öz: Çok şeritli dönel kavşakların alternatif bir formu olan turbo dönel kavşaklar, kapasite ve güvenliğinin çok şeritli dönel kavşaklara göre avantajlarından dolayı son yıllarda birçok ülkede tasarım rehberleri hazırlanarak uygulamalarına başlanılmıştır. Bu çalışmada turbo kavşakların güvenlik ve kapasite üstünlükleri göz önüne alınarak Bingöl Düzağaç mevkiinde bulunan sinyalizasyonlu ana yol, tali yol kavşağında, yol kullanıcısı ve taşıt işletme maliyetlerinin azaltılması için turbo dönel kavşak olarak düzenleme ön çalışması yapılmıştır. Bu kavşakta belirlenen senaryoya göre devlet yolunda trafik akımının alt geçitli veya alt geçitsiz sağlanması durumunda rotor tipi turbo kavşakların sinyalizasyonuz uygulanması için kapasite hesaplanmıştır. Alt geçitli turbo kavşağın alt geçitsiz turbo kavşağa göre kavşak kollarının şerit doygunluk yüzdelerinde ortalama 4 kat azalma olmasına rağmen; ana konumda bulunan Bingöl Sanayi ve tali konumda bulunan Bingöl Şehir Merkezi kollarında trafik artışı olması durumunda sola dönüşlerin üst geçitle sağlanması gerekeceği tespit edilmiştir.

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Turbo – Roundabouts and their Basic Evaluation at Realized Constructions in Czech Republic

Cited by 8 publications

References 1 publication

Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions?

Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions?

Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

Bingöl Düzağaç Kavşağının Rotor Tipi Turbo Dönel Kavşak Olarak Düzenlemesi Durumu için Kapasite Hesaplarının Ön Çalışması

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