Analyses of maximum-speed path definition at single-lane roundabouts
The process of designing roundabouts is an iterative process through which, in several checks, the design elements of a roundabout get optimized. Existing regulations for roundabouts involve swept path analyses, sight distance analyses and speed analyses of vehicles passing through the roundabout. S...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2018-04-01
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| Series: | Journal of Traffic and Transportation Engineering (English ed. Online) |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S209575641730123X |
| _version_ | 1819174560995475456 |
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| author | Sanja Šurdonja Vesna Dragčević Aleksandra Deluka-Tibljaš |
| author_facet | Sanja Šurdonja Vesna Dragčević Aleksandra Deluka-Tibljaš |
| author_sort | Sanja Šurdonja |
| collection | DOAJ |
| description | The process of designing roundabouts is an iterative process through which, in several checks, the design elements of a roundabout get optimized. Existing regulations for roundabouts involve swept path analyses, sight distance analyses and speed analyses of vehicles passing through the roundabout. Speed analyses are done mostly based on two models, Dutch and American. Each of these two models, in their own way takes into account design elements of the roundabouts, and the US model also envisions the construction of vehicle paths through the roundabout. Main assumption of both models is that vehicle paths through roundabouts consist of few connected radii. US models for path definition takes into account safety distances from marked lines and geometric elements (curbs) at the entrance and exit and through roundabout. Experimentally determined elements of the vehicle path through the roundabout, do not correspond to those recommendations. Comparison of the measured speed at the roundabouts and speed calculated according to aforementioned models at several roundabouts in Croatia, showed a significant difference. An experimental research was conducted as a first step in developing a new model for operating speed through roundabouts. The research aimed to define the basic path elements of vehicle movement in the roundabout at which the maximum speed is achieved. Results of the study are presented in this paper. Keywords: Traffic safety, Operational speed, Roundabout, Speed path definition, Model |
| first_indexed | 2024-12-22T20:40:55Z |
| format | Article |
| id | doaj.art-7b4ac660bc3f4a55800c47f7ee845b8e |
| institution | Directory Open Access Journal |
| issn | 2095-7564 |
| language | English |
| last_indexed | 2024-12-22T20:40:55Z |
| publishDate | 2018-04-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Traffic and Transportation Engineering (English ed. Online) |
| spelling | doaj.art-7b4ac660bc3f4a55800c47f7ee845b8e2022-12-21T18:13:20ZengKeAi Communications Co., Ltd.Journal of Traffic and Transportation Engineering (English ed. Online)2095-75642018-04-01528395Analyses of maximum-speed path definition at single-lane roundaboutsSanja Šurdonja0Vesna Dragčević1Aleksandra Deluka-Tibljaš2Faculty of Civil Engineering, University of Rijeka, Rijeka 51000, Croatia; Corresponding author. Tel.: +385 5 1265900.Faculty of Civil Engineering, University of Zagreb, Zagreb 10000, CroatiaFaculty of Civil Engineering, University of Rijeka, Rijeka 51000, CroatiaThe process of designing roundabouts is an iterative process through which, in several checks, the design elements of a roundabout get optimized. Existing regulations for roundabouts involve swept path analyses, sight distance analyses and speed analyses of vehicles passing through the roundabout. Speed analyses are done mostly based on two models, Dutch and American. Each of these two models, in their own way takes into account design elements of the roundabouts, and the US model also envisions the construction of vehicle paths through the roundabout. Main assumption of both models is that vehicle paths through roundabouts consist of few connected radii. US models for path definition takes into account safety distances from marked lines and geometric elements (curbs) at the entrance and exit and through roundabout. Experimentally determined elements of the vehicle path through the roundabout, do not correspond to those recommendations. Comparison of the measured speed at the roundabouts and speed calculated according to aforementioned models at several roundabouts in Croatia, showed a significant difference. An experimental research was conducted as a first step in developing a new model for operating speed through roundabouts. The research aimed to define the basic path elements of vehicle movement in the roundabout at which the maximum speed is achieved. Results of the study are presented in this paper. Keywords: Traffic safety, Operational speed, Roundabout, Speed path definition, Modelhttp://www.sciencedirect.com/science/article/pii/S209575641730123X |
| spellingShingle | Sanja Šurdonja Vesna Dragčević Aleksandra Deluka-Tibljaš Analyses of maximum-speed path definition at single-lane roundabouts Journal of Traffic and Transportation Engineering (English ed. Online) |
| title | Analyses of maximum-speed path definition at single-lane roundabouts |
| title_full | Analyses of maximum-speed path definition at single-lane roundabouts |
| title_fullStr | Analyses of maximum-speed path definition at single-lane roundabouts |
| title_full_unstemmed | Analyses of maximum-speed path definition at single-lane roundabouts |
| title_short | Analyses of maximum-speed path definition at single-lane roundabouts |
| title_sort | analyses of maximum speed path definition at single lane roundabouts |
| url | http://www.sciencedirect.com/science/article/pii/S209575641730123X |
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