[1] Qu Zhaowei, Cao Ningbo, Chen Yongheng, Bai Qiaowen, et al. Capacity model of on-ramp merging section of urban expressway [J]. Journal of Southeast University (English Edition), 2016, 32 (2): 226-232. [doi:10.3969/j.issn.1003-7985.2016.02.016]
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Capacity model of on-ramp merging section of urban expressway(
)
城市快速路入口交织区通行能力模型
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 32
- Issue:
- 2016 2
- Page:
- 226-232
- Research Field:
- Traffic and Transportation Engineering
- Publishing date:
- 2016-06-20
Info
- Title:
- Capacity model of on-ramp merging section of urban expressway
- 城市快速路入口交织区通行能力模型
- Author(s):
- Qu Zhaowei, Cao Ningbo, Chen Yongheng, Bai Qiaowen, Sun Lei
- College of Transportation, Jilin University, Changchun 130022, China
- PACS:
- U491
- DOI:
- 10.3969/j.issn.1003-7985.2016.02.016
- Abstract:
- To establish the empirical capacity model of an on-ramp merging section, the Erlang distribution is first selected to define the time headway distribution, and then the gap acceptance theory is applied to develop the basic capacity model of the on-ramp merging section. Since not all the time headways on the shoulder lane can be made full use of by on-ramp vehicles, a modified capacity model is developed, which takes the usage probability of time headway into consideration. Then, a model of capacity discount coefficient ξ is developed. Finally, based on the modified capacity model and the model of capacity discount coefficient, an empirical merge capacity model which contains the shoulder lane volume, critical gap, and the distance from nose to merging point, is constructed. Results show that, compared with other models, the proposed model is more reasonable since it takes merging section geometry into consideration, and it is easy to apply. The merge capacity varies with the shoulder lane volume, the critical gap, the distance between the nose and the merging point, and the design velocity of the shoulder lane and ramp.
- 为建立快速路入口交织区的经验通行能力模型, 首先利用Erlang分布来定义车辆车头时距分布, 然后采用间隙接受理论模型推导入口交织区基本通行能力模型.由于并非所有主路车流车头时距都能被匝道车辆充分利用, 因此建立了修正的通行能力模型, 模型考虑了车头时距被利用的概率.然后, 建立了通行能力折减系数(ξ)模型.结合修正的通行能力模型和折减系数模型建立了包括主线流量、临界间隙和鼻端到汇合点距离等参数的入口匝道经验通行能力模型.结果表明, 与其他模型相比, 所建立的经验模型考虑了交织区几何条件且简单易用, 交织区通行能力和主路流量、临界间隙、鼻端到汇合点距离及主线和匝道的设计速度紧密相关.
References:
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Memo
- Memo:
-
Biography: Qu Zhaowei(1962—), male, doctor, professor, quzw@jlu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51278520 51278220), the Science and Technology Development Project of Jilin Province(No.20130206093SF).
Citation: Qu Zhaowei, Cao Ningbo, Chen Yongheng, et al. Capacity model of on-ramp merging section of urban expressway[J].Journal of Southeast University(English Edition), 2016, 32(2):226-232.doi:10.3969/j.issn.1003-7985.2016.02.016.