The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout
With the growing number of vehicles utilizing roads in the city of Doha, Qatar, most intersections, particularly multilane roundabouts, have been facing traffic congestion dilemma, where traffic demand exceeds capacity. A new design for multilane roundabouts, known as a rotor turbo roundabout, was c...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Journal of Advanced Transportation |
| Online Access: | http://dx.doi.org/10.1155/2020/5472806 |
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| author | Zuhair Elhassy Hatem Abou-Senna Khaled Shaaban Essam Radwan |
| author_facet | Zuhair Elhassy Hatem Abou-Senna Khaled Shaaban Essam Radwan |
| author_sort | Zuhair Elhassy |
| collection | DOAJ |
| description | With the growing number of vehicles utilizing roads in the city of Doha, Qatar, most intersections, particularly multilane roundabouts, have been facing traffic congestion dilemma, where traffic demand exceeds capacity. A new design for multilane roundabouts, known as a rotor turbo roundabout, was considered as an alternative to an existing highly congested multilane roundabout. The new design features spiral roadway markings and raised lane dividers which prevent maneuvering within the roundabout and eliminate cutting-offs and weavings. This design has achieved high capacity and low delay in many European countries. In this study, a traffic simulation program, VISSIM, is used to model the complex traffic operation of both the existing and proposed multilane roundabouts and to replicate the high traffic conditions and aggressive driving behavior prevalent among the Middle East countries. Three different rotor designs were examined in an attempt to have a valid comparison between the two types of roundabouts and to adhere to the standard design of the rotor roundabout without violating its essential features. The proposed designs performed slightly better on the minor approaches and managed to deliver an overall improved LOS compared to the conventional design. Major approaches, however, exhibited an increase in vehicle delay and queue lengths. The results showed that the capacity of the conventional three-lane roundabout was always superior to the capacity of the rotor roundabouts. It was concluded that rotor roundabouts may not be suitable for intersections with high demand volumes exceeding 4500 vehicles per hour, and whenever the traffic flow condition is oversaturated. |
| format | Article |
| id | doaj-art-cf8a6676566249559ba22e0e7493afc9 |
| institution | Kabale University |
| issn | 0197-6729 2042-3195 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Advanced Transportation |
| spelling | doaj-art-cf8a6676566249559ba22e0e7493afc92025-02-03T05:54:27ZengWileyJournal of Advanced Transportation0197-67292042-31952020-01-01202010.1155/2020/54728065472806The Implications of Converting a High-Volume Multilane Roundabout into a Turbo RoundaboutZuhair Elhassy0Hatem Abou-Senna1Khaled Shaaban2Essam Radwan3Department of Civil, Environmental, and Construction Engineering (CECE), University of Central Florida, Orlando, FL, USADepartment of Civil, Environmental, and Construction Engineering (CECE), University of Central Florida, Orlando, FL, USADepartment of Civil Engineering/Qatar Transportation and Traffic Safety Center, Qatar University, PO Box 2713, Doha, QatarDepartment of Civil, Environmental, and Construction Engineering (CECE), University of Central Florida, Orlando, FL, USAWith the growing number of vehicles utilizing roads in the city of Doha, Qatar, most intersections, particularly multilane roundabouts, have been facing traffic congestion dilemma, where traffic demand exceeds capacity. A new design for multilane roundabouts, known as a rotor turbo roundabout, was considered as an alternative to an existing highly congested multilane roundabout. The new design features spiral roadway markings and raised lane dividers which prevent maneuvering within the roundabout and eliminate cutting-offs and weavings. This design has achieved high capacity and low delay in many European countries. In this study, a traffic simulation program, VISSIM, is used to model the complex traffic operation of both the existing and proposed multilane roundabouts and to replicate the high traffic conditions and aggressive driving behavior prevalent among the Middle East countries. Three different rotor designs were examined in an attempt to have a valid comparison between the two types of roundabouts and to adhere to the standard design of the rotor roundabout without violating its essential features. The proposed designs performed slightly better on the minor approaches and managed to deliver an overall improved LOS compared to the conventional design. Major approaches, however, exhibited an increase in vehicle delay and queue lengths. The results showed that the capacity of the conventional three-lane roundabout was always superior to the capacity of the rotor roundabouts. It was concluded that rotor roundabouts may not be suitable for intersections with high demand volumes exceeding 4500 vehicles per hour, and whenever the traffic flow condition is oversaturated.http://dx.doi.org/10.1155/2020/5472806 |
| spellingShingle | Zuhair Elhassy Hatem Abou-Senna Khaled Shaaban Essam Radwan The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout Journal of Advanced Transportation |
| title | The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout |
| title_full | The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout |
| title_fullStr | The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout |
| title_full_unstemmed | The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout |
| title_short | The Implications of Converting a High-Volume Multilane Roundabout into a Turbo Roundabout |
| title_sort | implications of converting a high volume multilane roundabout into a turbo roundabout |
| url | http://dx.doi.org/10.1155/2020/5472806 |
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