The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts
Double-lane roundabouts have been created in many European countries over the past few centuries and are now characterized by an unsafe geometric development and by a low sustainability capacity or level. In this regard, new double-lane geometries have been implemented to overcome to these critical...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Journal of Advanced Transportation |
| Online Access: | http://dx.doi.org/10.1155/2018/2952074 |
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| author | Giovanni Tesoriere Tiziana Campisi Antonino Canale Tedi Zgrablić |
| author_facet | Giovanni Tesoriere Tiziana Campisi Antonino Canale Tedi Zgrablić |
| author_sort | Giovanni Tesoriere |
| collection | DOAJ |
| description | Double-lane roundabouts have been created in many European countries over the past few centuries and are now characterized by an unsafe geometric development and by a low sustainability capacity or level. In this regard, new double-lane geometries have been implemented to overcome to these critical points. This article shows a comparison of two nonconventional double-lane roundabout schemes defined as elliptical and turbo. Considering this research on the unsafe and congested conditions for each road schemes at grade, the microsimulation approach allows comparing schemes of intersections not yet realized in order to be able to evaluate the critical issues. A symmetric traffic distribution and an identical vehicle mix for both design solutions are considered. The research was conducted considering two different double-lane roundabout-turbo roundabout and the elliptical roundabout. By comparing their geometry and technical elements, this article assumes that turbo roundabout due to its physical separating traffic lanes in the central circulatory carriageway will enable potentially better traffic safety conditions. This article has the following main goal: a comparison of traffic safety using VISSIM microsimulator and SSAM tools. The results can provide to show safety level on investigated scenario considering level of service (LOS) and also the possibility of obtaining time to collision (TTC) and postencroachment time (PET) through the use of surrogate parameters obtained by SSAM tool. In fact, the surrogate safety parameters allows evaluating the possible collision scenarios between them, according to the trajectories of the single vehicles. This assessment is useful in order to be able to evaluate by the local authorities which of the examined schemes can provide greater negativity in the construction and operation phase. Therefore this comparative analysis allows reducing, in the preliminary phase, possible security impacts and also economic ones for the community. |
| format | Article |
| id | doaj-art-5c5d388c3160403eb946b58ba022cf39 |
| institution | Kabale University |
| issn | 0197-6729 2042-3195 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Advanced Transportation |
| spelling | doaj-art-5c5d388c3160403eb946b58ba022cf392025-02-03T01:10:57ZengWileyJournal of Advanced Transportation0197-67292042-31952018-01-01201810.1155/2018/29520742952074The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo RoundaboutsGiovanni Tesoriere0Tiziana Campisi1Antonino Canale2Tedi Zgrablić3Faculty of Engineering and Architecture, University of Enna Kore, ItalyFaculty of Engineering and Architecture, University of Enna Kore, ItalyFaculty of Engineering and Architecture, University of Enna Kore, ItalyFaculty of Engineering and Architecture, University of Maribor, SloveniaDouble-lane roundabouts have been created in many European countries over the past few centuries and are now characterized by an unsafe geometric development and by a low sustainability capacity or level. In this regard, new double-lane geometries have been implemented to overcome to these critical points. This article shows a comparison of two nonconventional double-lane roundabout schemes defined as elliptical and turbo. Considering this research on the unsafe and congested conditions for each road schemes at grade, the microsimulation approach allows comparing schemes of intersections not yet realized in order to be able to evaluate the critical issues. A symmetric traffic distribution and an identical vehicle mix for both design solutions are considered. The research was conducted considering two different double-lane roundabout-turbo roundabout and the elliptical roundabout. By comparing their geometry and technical elements, this article assumes that turbo roundabout due to its physical separating traffic lanes in the central circulatory carriageway will enable potentially better traffic safety conditions. This article has the following main goal: a comparison of traffic safety using VISSIM microsimulator and SSAM tools. The results can provide to show safety level on investigated scenario considering level of service (LOS) and also the possibility of obtaining time to collision (TTC) and postencroachment time (PET) through the use of surrogate parameters obtained by SSAM tool. In fact, the surrogate safety parameters allows evaluating the possible collision scenarios between them, according to the trajectories of the single vehicles. This assessment is useful in order to be able to evaluate by the local authorities which of the examined schemes can provide greater negativity in the construction and operation phase. Therefore this comparative analysis allows reducing, in the preliminary phase, possible security impacts and also economic ones for the community.http://dx.doi.org/10.1155/2018/2952074 |
| spellingShingle | Giovanni Tesoriere Tiziana Campisi Antonino Canale Tedi Zgrablić The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts Journal of Advanced Transportation |
| title | The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts |
| title_full | The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts |
| title_fullStr | The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts |
| title_full_unstemmed | The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts |
| title_short | The Surrogate Safety Appraisal of the Unconventional Elliptical and Turbo Roundabouts |
| title_sort | surrogate safety appraisal of the unconventional elliptical and turbo roundabouts |
| url | http://dx.doi.org/10.1155/2018/2952074 |
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