Intersection Sight Distance Characteristics of Turbo Roundabouts
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 develop...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Designs |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2411-9660/5/1/16 |
| _version_ | 1827698246553698304 |
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| author | Akshay Salwan Said M. Easa Narayana Raju Shriniwas Arkatkar |
| author_facet | Akshay Salwan Said M. Easa Narayana Raju Shriniwas Arkatkar |
| author_sort | Akshay Salwan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T13:25:46Z |
| format | Article |
| id | doaj.art-0e45891280a2489887619c71b3b63896 |
| institution | Directory Open Access Journal |
| issn | 2411-9660 |
| language | English |
| last_indexed | 2024-03-10T13:25:46Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Designs |
| spelling | doaj.art-0e45891280a2489887619c71b3b638962023-11-21T09:37:47ZengMDPI AGDesigns2411-96602021-03-01511610.3390/designs5010016Intersection Sight Distance Characteristics of Turbo RoundaboutsAkshay Salwan0Said M. Easa1Narayana Raju2Shriniwas Arkatkar3Department of Civil Engineering, Ryerson University, Toronto, ON M5B 2K3, CanadaDepartment of Civil Engineering, Ryerson University, Toronto, ON M5B 2K3, CanadaTransportation and planning, Delft University of Technology (TU Delft), 2628 CD Delft, The NetherlandsDepartment of Civil Engineering, SVNIT Surat, Gujarat 395007, IndiaA 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.https://www.mdpi.com/2411-9660/5/1/16turbo roundaboutintersection sight distanceroad safetylateral clearance |
| spellingShingle | Akshay Salwan Said M. Easa Narayana Raju Shriniwas Arkatkar Intersection Sight Distance Characteristics of Turbo Roundabouts Designs turbo roundabout intersection sight distance road safety lateral clearance |
| title | Intersection Sight Distance Characteristics of Turbo Roundabouts |
| title_full | Intersection Sight Distance Characteristics of Turbo Roundabouts |
| title_fullStr | Intersection Sight Distance Characteristics of Turbo Roundabouts |
| title_full_unstemmed | Intersection Sight Distance Characteristics of Turbo Roundabouts |
| title_short | Intersection Sight Distance Characteristics of Turbo Roundabouts |
| title_sort | intersection sight distance characteristics of turbo roundabouts |
| topic | turbo roundabout intersection sight distance road safety lateral clearance |
| url | https://www.mdpi.com/2411-9660/5/1/16 |
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