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Intersection Sight Distance Characteristics of Turbo Roundabouts

Department of Civil Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada
Transportation and planning, Delft University of Technology (TU Delft), 2628 CD Delft, The Netherlands
Department of Civil Engineering, SVNIT Surat, Gujarat 395007, India
Author to whom correspondence should be addressed.
Received: 1 January 2021 / Revised: 19 February 2021 / Accepted: 20 February 2021 / Published: 8 March 2021
A turbo roundabout uses spiral circulatory roads for effectively counteracting the problems faced in modern multilane roundabouts. First developed in 1996, the turbo roundabout has an advantage over the conventional roundabout regarding capacity and safety. Turbo roundabouts are still in the developing phase in North America, but even in the European subcontinent where they exist in large numbers, reliable analytical studies on the critical parameters of roundabout visibility are lacking. Visibility (sight distance) helps to shape the geometry of the intersection and aids in safety. This paper presents the mathematical characteristics of the intersection geometry and intersection sight distance (ISD) of the turbo roundabout. Mathematical formulas are presented for the sight distance from the approaching vehicle to the conflicting-entering and circulating vehicles. The maximum lateral clearances to the conflicting vehicles are derived using mathematical optimization. The developed analytical method is verified graphically using AutoCAD. To assist in practical applications, design aids for the maximum lateral clearance are presented. The presented method and design aids should aid in promoting safety at turbo roundabouts. View Full-Text
Keywords: turbo roundabout; intersection sight distance; road safety; lateral clearance turbo roundabout; intersection sight distance; road safety; lateral clearance
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MDPI and ACS Style

Salwan, A.; Easa, S.M.; Raju, N.; Arkatkar, S. Intersection Sight Distance Characteristics of Turbo Roundabouts. Designs 2021, 5, 16.

AMA Style

Salwan A, Easa SM, Raju N, Arkatkar S. Intersection Sight Distance Characteristics of Turbo Roundabouts. Designs. 2021; 5(1):16.

Chicago/Turabian Style

Salwan, Akshay, Said M. Easa, Narayana Raju, and Shriniwas Arkatkar. 2021. "Intersection Sight Distance Characteristics of Turbo Roundabouts" Designs 5, no. 1: 16.

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