Review of Roundabout Capacity Based on Gap Acceptance
Circulating vehicles have priority at modern roundabouts. Entrance vehicles can enter the roundabout when there is a time gap larger than the critical gap; otherwise, the vehicles need to wait until there is a large enough gap. The gap acceptance theory was used to analyze the entrance capacity of r...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Journal of Advanced Transportation |
| Online Access: | http://dx.doi.org/10.1155/2019/4971479 |
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| author | Ruijun Guo Leilei Liu Wanxiang Wang |
| author_facet | Ruijun Guo Leilei Liu Wanxiang Wang |
| author_sort | Ruijun Guo |
| collection | DOAJ |
| description | Circulating vehicles have priority at modern roundabouts. Entrance vehicles can enter the roundabout when there is a time gap larger than the critical gap; otherwise, the vehicles need to wait until there is a large enough gap. The gap acceptance theory was used to analyze the entrance capacity of roundabouts, which can be derived by queuing theory involving two vehicle streams. The paper introduces the main styles of headway distribution, which are named as bunched exponential distribution or M3 distribution. The calculation model of free stream ratio is also introduced. The entrance capacity models can be classified by different entrance vehicle types, which are piecewise function or linear function, or by different critical gap types, which are constant or stochastic function. For each form, the typical capacity expressions are given. The calculation values show a very small difference between these kinds of models. The capacity value based on the critical gap of stochastic function is more realistic and more complex in function style. Some conclusions were derived that drivers’ nonhomogeneous and inconsistent character is more realistic than the fixed critical gap and following gap. The calculation results of capacity are similar to the field capacity under the assumption of homogeneity and continuance, with only a minor percent deviation. Finally, the paper points out additional problems and the suggested research in capacity of roundabouts. |
| format | Article |
| id | doaj-art-cf3a102f189447a08ab07258d2c3d008 |
| institution | Kabale University |
| issn | 0197-6729 2042-3195 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Advanced Transportation |
| spelling | doaj-art-cf3a102f189447a08ab07258d2c3d0082025-02-03T01:26:10ZengWileyJournal of Advanced Transportation0197-67292042-31952019-01-01201910.1155/2019/49714794971479Review of Roundabout Capacity Based on Gap AcceptanceRuijun Guo0Leilei Liu1Wanxiang Wang2School of Traffic and Transportation, Dalian Jiaotong University, Dalian 116028, ChinaSchool of Traffic and Transportation, Dalian Jiaotong University, Dalian 116028, ChinaSchool of Traffic and Transportation, Dalian Jiaotong University, Dalian 116028, ChinaCirculating vehicles have priority at modern roundabouts. Entrance vehicles can enter the roundabout when there is a time gap larger than the critical gap; otherwise, the vehicles need to wait until there is a large enough gap. The gap acceptance theory was used to analyze the entrance capacity of roundabouts, which can be derived by queuing theory involving two vehicle streams. The paper introduces the main styles of headway distribution, which are named as bunched exponential distribution or M3 distribution. The calculation model of free stream ratio is also introduced. The entrance capacity models can be classified by different entrance vehicle types, which are piecewise function or linear function, or by different critical gap types, which are constant or stochastic function. For each form, the typical capacity expressions are given. The calculation values show a very small difference between these kinds of models. The capacity value based on the critical gap of stochastic function is more realistic and more complex in function style. Some conclusions were derived that drivers’ nonhomogeneous and inconsistent character is more realistic than the fixed critical gap and following gap. The calculation results of capacity are similar to the field capacity under the assumption of homogeneity and continuance, with only a minor percent deviation. Finally, the paper points out additional problems and the suggested research in capacity of roundabouts.http://dx.doi.org/10.1155/2019/4971479 |
| spellingShingle | Ruijun Guo Leilei Liu Wanxiang Wang Review of Roundabout Capacity Based on Gap Acceptance Journal of Advanced Transportation |
| title | Review of Roundabout Capacity Based on Gap Acceptance |
| title_full | Review of Roundabout Capacity Based on Gap Acceptance |
| title_fullStr | Review of Roundabout Capacity Based on Gap Acceptance |
| title_full_unstemmed | Review of Roundabout Capacity Based on Gap Acceptance |
| title_short | Review of Roundabout Capacity Based on Gap Acceptance |
| title_sort | review of roundabout capacity based on gap acceptance |
| url | http://dx.doi.org/10.1155/2019/4971479 |
| work_keys_str_mv | AT ruijunguo reviewofroundaboutcapacitybasedongapacceptance AT leileiliu reviewofroundaboutcapacitybasedongapacceptance AT wanxiangwang reviewofroundaboutcapacitybasedongapacceptance |