A Method for Optimizing Geometric Design and Signal Timing for Contraflow Left-turn Lanes with Double-exits

SONG Lang; WANG Jian; YANG Binyu; ZHU Yong

doi:10.3963/j.jssn.1674-4861.2022.03.008

Volume 40 Issue 3

Jun. 2022

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Article Navigation > Journal of Transport Information and Safety > 2022 > 40(3): 75-85

SONG Lang, WANG Jian, YANG Binyu, ZHU Yong. A Method for Optimizing Geometric Design and Signal Timing for Contraflow Left-turn Lanes with Double-exits[J]. Journal of Transport Information and Safety, 2022, 40(3): 75-85. doi: 10.3963/j.jssn.1674-4861.2022.03.008

Citation:

SONG Lang, WANG Jian, YANG Binyu, ZHU Yong. A Method for Optimizing Geometric Design and Signal Timing for Contraflow Left-turn Lanes with Double-exits[J]. Journal of Transport Information and Safety, 2022, 40(3): 75-85. doi: 10.3963/j.jssn.1674-4861.2022.03.008

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A Method for Optimizing Geometric Design and Signal Timing for Contraflow Left-turn Lanes with Double-exits

doi: 10.3963/j.jssn.1674-4861.2022.03.008

SONG Lang^{1, 2
,},
WANG Jian^{1
,
,},
YANG Binyu¹,
ZHU Yong²

1.
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
2.
China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd, Chongqing 400067, China

Received Date: 2021-12-24
Available Online: 2022-07-25

Abstract

Abstract

To solve the problem of ineffective match between the lengths of contraflow left-turn lanes(i.e., dynamic borrowed exit lines through pre-signal control)with single-exit(i.e., one pre-signal exit only)and corresponding traffic demand, a method for optimizing the geometric design and signal timing for contraflow left-turn lanes with double-exits(i.e., two pre-signal exits)is proposed after analyzing the design of contraflow left-turn lanes with single-exit. Based on the observed maneuvers of vehicles in the contraflow left-turn lanes and queuing behaviors of vehicles in left-turn lanes with single-exit and double-exits, their capacity and delay estimation models are developed, respectively. The conventional design methods for signal timing of single-exit and double-exits are integrated into a unified optimization model by introducing a dummy variable to indicate whether each pre-signal exit is enabled. Considering the constraints of coordination between main and pre-signals, saturation and traffic wave transfer, the objective of the model is to minimize the delay per vehicle. Through this model, the basis for designing the length of contraflow left-turn lanes can be obtained. Finally, a case study is carried out, the results indicate that: ①the improvement of intersection capacity is largest when the length of contraflow left-turn lanes is 80 m.②When the capacity of the roads meets traffic demand, the shorter the length of contraflow left-turn lanes, the more significant the reduction of traffic delay at the intersection.③If longer contraflow left-turn lanes are adopted to maintain road capacity, the benefit of contraflow left-turn lanes with double-exits are better than lanes with single-exit.④Considering traffic delay, capacity, and other factors, the length of contraflow left-turn lanes with single-exit is suggested to be 40 to 60 m, while lanes with double-exits should be set around 80 m. ⑤The contraflow left-turn lanes with double-exits are able to control pre-signal exits as requested, which is flexible and suitable for various traffic scenarios.
- traffic engineering,
- contraflow left-turn lane,
- geometric design,
- signal timing optimization,
- exit lanes for left-turn intersection,
- reversible left-turn lane

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References(34)

References

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A Method for Optimizing Geometric Design and Signal Timing for Contraflow Left-turn Lanes with Double-exits

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