Geometric Design of Suburban Roundabouts
A modern roundabout is an intersection with a circulatory roadway at which the vehicle speed is low, and the traffic is continuous and circulating in one direction around the central island towards the exits at the approach legs. Modern roundabout design is an iterative process that is composed of t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-08-01
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| Series: | Encyclopedia |
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| Online Access: | https://www.mdpi.com/2673-8392/1/3/56 |
| _version_ | 1797519503414788096 |
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| author | Saša Ahac Vesna Dragčević |
| author_facet | Saša Ahac Vesna Dragčević |
| author_sort | Saša Ahac |
| collection | DOAJ |
| description | A modern roundabout is an intersection with a circulatory roadway at which the vehicle speed is low, and the traffic is continuous and circulating in one direction around the central island towards the exits at the approach legs. Modern roundabout design is an iterative process that is composed of the following steps: (1) the identification of the roundabout as the optimal traffic solution; (2) the definition of the number of lanes at the intersection based on the required capacity and the level of service; (3) the initial design of the roundabout geometry; (4) design vehicle swept path, the fastest path analysis, and visibility performance checks; and (5) detailed roundabout design if the results of the performance checks are in line with the design recommendations. Initial roundabout geometry design elements are not independent of each other; therefore, care must be taken to provide compatibility between them. An overview and a comparative analysis of the initial geometric design elements for suburban single-lane roundabouts defined in roundabout design guidelines and norms used in Croatia, Austria, France, the Netherlands, Germany, Serbia, and Switzerland is given in this entry. |
| first_indexed | 2024-03-10T07:43:43Z |
| format | Article |
| id | doaj.art-973773ca1b594ecd9ac2d3ff54402d7f |
| institution | Directory Open Access Journal |
| issn | 2673-8392 |
| language | English |
| last_indexed | 2024-03-10T07:43:43Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Encyclopedia |
| spelling | doaj.art-973773ca1b594ecd9ac2d3ff54402d7f2023-11-22T12:49:25ZengMDPI AGEncyclopedia2673-83922021-08-011372074310.3390/encyclopedia1030056Geometric Design of Suburban RoundaboutsSaša Ahac0Vesna Dragčević1Faculty of Civil Engineering, University of Zagreb, 10000 Zagreb, CroatiaFaculty of Civil Engineering, University of Zagreb, 10000 Zagreb, CroatiaA modern roundabout is an intersection with a circulatory roadway at which the vehicle speed is low, and the traffic is continuous and circulating in one direction around the central island towards the exits at the approach legs. Modern roundabout design is an iterative process that is composed of the following steps: (1) the identification of the roundabout as the optimal traffic solution; (2) the definition of the number of lanes at the intersection based on the required capacity and the level of service; (3) the initial design of the roundabout geometry; (4) design vehicle swept path, the fastest path analysis, and visibility performance checks; and (5) detailed roundabout design if the results of the performance checks are in line with the design recommendations. Initial roundabout geometry design elements are not independent of each other; therefore, care must be taken to provide compatibility between them. An overview and a comparative analysis of the initial geometric design elements for suburban single-lane roundabouts defined in roundabout design guidelines and norms used in Croatia, Austria, France, the Netherlands, Germany, Serbia, and Switzerland is given in this entry.https://www.mdpi.com/2673-8392/1/3/56approach alignmentouter radiuscirculatory roadwayapronsplitter islandroundabout entry |
| spellingShingle | Saša Ahac Vesna Dragčević Geometric Design of Suburban Roundabouts Encyclopedia approach alignment outer radius circulatory roadway apron splitter island roundabout entry |
| title | Geometric Design of Suburban Roundabouts |
| title_full | Geometric Design of Suburban Roundabouts |
| title_fullStr | Geometric Design of Suburban Roundabouts |
| title_full_unstemmed | Geometric Design of Suburban Roundabouts |
| title_short | Geometric Design of Suburban Roundabouts |
| title_sort | geometric design of suburban roundabouts |
| topic | approach alignment outer radius circulatory roadway apron splitter island roundabout entry |
| url | https://www.mdpi.com/2673-8392/1/3/56 |
| work_keys_str_mv | AT sasaahac geometricdesignofsuburbanroundabouts AT vesnadragcevic geometricdesignofsuburbanroundabouts |