Design of Turbo Roundabouts Based on the Rules of Vehicle Movement Geometry

Džambas, Tamara; Ahac, Saša; Dragčević, Vesna

doi:10.1061/(asce)te.1943-5436.0000850

Cited by 11 publications

(27 citation statements)

References 10 publications

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“…This approach is similar to an earlier prediction model for operating speeds at Australian roundabouts [19]. Džambas et al [20] found similar correlation between vehicle speeds at turbo roundabouts and the radius of vehicle path. Another approach for speed prediction models was developed for Italian roundabouts [21] where the predicted operating speed was found to be correlated with the diameter of the inscribed angle, the width of the circulatory roadway, and the width of the entry lane.…”

Section: Introductionsupporting

confidence: 61%

“…Pilko et al [22] measured operating speeds at four single-lane roundabouts in the City of Zagreb, the capital city of Croatia, where they found those operating speeds to be typically below 33.9 km/h. Several other studies found that vehicle speeds at turbo roundabouts are typically below 40 km/h [20,31,32]. Based on these studies, the measured operating speeds at Abu Dhabi roundabouts are typically higher than those in other parts of the world.…”

Section: Data Collectionmentioning

confidence: 86%

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Predicting Operating Speeds at Urban Multilane Roundabouts in Abu Dhabi, United Arab Emirates

Almoarawi

Dabbour

2018

Journal of Advanced Transportation

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There are more than 460 multilane roundabouts located in Abu Dhabi, the capital city of the United Arab Emirates, and its surrounding areas. Most of those roundabouts have three entry/circulatory/exit lanes with large radii, which resulted in the majority of drivers exceeding the speed limits for those roundabouts. Those excessive operating speeds, along with lack of drivers' awareness of the proper rules of driving at roundabouts, have resulted in increased collision frequencies at Abu Dhabi roundabouts. In this paper, operating speeds were measured at 12 roundabouts in Abu Dhabi and those collected speed observations were used to calibrate regression models to predict the 85th percentile operating speeds at roundabouts in Abu Dhabi. Predicting operating speed at a roundabout, during its design stage, is necessary to ensure that the expected operating speed and capacity will meet the design expectations. Three models were calibrated to predict the entry, circulating, and exit speeds, respectively. The calibrated models were validated with data not used in calibration and they were found to be stable and robust. The findings of this research study will help engineers when designing new roundabouts in Abu Dhabi or other cities with similar characteristics. This research study also provides a methodological framework for other researchers when conducting similar speed studies for roundabouts in other cities or metropolitan areas around the world.

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Section: Introductionsupporting

confidence: 61%

Section: Data Collectionmentioning

confidence: 86%

Predicting Operating Speeds at Urban Multilane Roundabouts in Abu Dhabi, United Arab Emirates

Almoarawi

Dabbour

2018

Journal of Advanced Transportation

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“…This guide is mainly designed so that users can estimate the traffic behavior of a facility in specific traffic conditions, geometry, and environmental conditions (Isradi & Primary, 2020). Some parameters form the basis of geometric design: the vehicle's size, the plan's speed, the volume and capacity, and the level of service the road provides (Džambas, Ahac, & Dragčević, 2017).…”

Section: Road Geometric Design Guidelinesmentioning

confidence: 99%

The Geometric Design of Horizontal Alignment: A Case of Bojonggede-Kemang Area Route, West Java Indonesia

Nugroho¹,

Rifai²,

Akhir³

2023

IJOMS

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Roads are one of the basic infrastructure facilities in the development of an area. With the construction of roads, they can be used as access to transportation and as a driving force for an area's economy to grow better. The purpose of geometric planning on the Bojonggede-Kemang section road at STA 0 + 000 - STA 1 + 200 is to obtain a design that prioritizes user safety and comfort. The method used in this study is a manual method that refers to the 2021 Road Geometric Design Guidelines (PDGJ). The data used in this study used Google Earth. The results of the study obtained a class III primary local type road. The plan speed of 60 km / h was obtained based on the criteria design. Then, using values, the horizontal alignment of the Bojonggede-Kemang road section is of type S-C-S..

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“…It is necessary to stress that the design vehicle swept path should not be used not only as a performance check at the end of a design process, but also as a key parameter in geometric design of all turbo roundabout elements. Long term studies performed at the Department for Transportation of Faculty of Civil Engineering, University of Zagreb [8,6,7,3,22,23] have shown that this design approach ensures the usage of optimal intersection element dimensions and an unhindered path for the design vehicle through the intersection.…”

Section: Creating One Of Given Turbo Block Templatesmentioning

confidence: 99%

Modern Suburban Roundabouts in Croatia – Flower and Turbo Roundabouts

Dzambas,

Dragcevic,

Benci

2020

SJCE

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Turboroundabouts are specially designed multilane roundabouts with spiral circulatory roadway and physically separated traffic lanes. This roundabout layout was developed in the late nineties of the last century with the aim of increasing the traffic safety and capacity at classic multi-lane roundabouts. However, the experience has shown that turbo roundabouts have certain deficiencies -due to its complex geometry and large outer diameters, the reconstruction of existing less safe multi-lane roundabouts into turbo roundabouts is financially very demanding. In that case, a construction of so called flower roundabout is much better solution. Namely, unlike in the case of turbo roundabouts, it is possible to adjust the existing multi-lane roundabouts into flower roundabouts without moving any of the outer road curbs. Within the scope of this study, geometric design and performances of these two modern roundabout types are analyzed. Their advantages and disadvantages in regard to performances of classic multi-lane roundabouts are discussed, examples from Croatian design practice are presented, and recommendations for their planning and designing are provided.

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Design of Turbo Roundabouts Based on the Rules of Vehicle Movement Geometry

Cited by 11 publications

References 10 publications

Predicting Operating Speeds at Urban Multilane Roundabouts in Abu Dhabi, United Arab Emirates

Predicting Operating Speeds at Urban Multilane Roundabouts in Abu Dhabi, United Arab Emirates

The Geometric Design of Horizontal Alignment: A Case of Bojonggede-Kemang Area Route, West Java Indonesia

Modern Suburban Roundabouts in Croatia – Flower and Turbo Roundabouts

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