# [1]王京元,王炜.保护相位下左转车道存储段长度计算[J].东南大学学报(自然科学版),2010,40(4):852-859.[doi:10.3969/j.issn.1001-0505.2010.04.036] 　Wang Jingyuan,Wang Wei.Calculation of storage lengths for left-turn lanes with protected phases[J].Journal of Southeast University (Natural Science Edition),2010,40(4):852-859.[doi:10.3969/j.issn.1001-0505.2010.04.036] 点击复制 保护相位下左转车道存储段长度计算() 分享到： var jiathis_config = { data_track_clickback: true };

40

2010年第4期

852-859

2010-07-20

## 文章信息/Info

Title:
Calculation of storage lengths for left-turn lanes with protected phases

1 深圳大学土木工程学院,深圳 518060; 2 东南大学交通学院,南京 210096
Author(s):
1 College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
2 School of Transportation, Southeast University, Nanjing 210096, China

Keywords:

U491.54;U491
DOI:
10.3969/j.issn.1001-0505.2010.04.036

Abstract:
Storage lengths of left-turn lane for signalized intersection approach with protected phase and only one left-turn lane were studied using queuing theory and probability theory. The storage length of this study focused on meeting the requirements of left-turn vehicles queuing. The main variables are left-turn volumes, cycle lengths and left-turn green time. A theoretical modal for calculating storage lengths for single left-turn lane with protected phase was established based on M/M/1 queuing system. The applicable and practical conditions are discussed. The variations of storage length with degree of saturation and left-turn volumes are analyzed. On this basis, the thresholds of queue length and degree of saturation etc. are proposed with overall consideration of geometric conditions, service quality and economic performance. It is indicated that the number of queuing vehicles can not be more than 20, and the practical saturation interval is [0, 0.8] for a 95% probability. Methods of determining values for three key parameters are discussed. They are the confidence probability, the design traffic volume and the queuing headway. Calculations and analyses were done for general conditions. Two sets of concepts are proposed in order to facilitate engineering application, which include limit traffic volume and limit queue length, critical traffic volume and critical queue length. The results are charted and the processes of determining the storage length are developed applying these charts. This study presents calculation guidelines for single left-turn lane with protected phase at signalized intersections approach, and can also be used to calculate the lengths of through and right-turn lane and queue after a little modification.

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