| Citation: | YANG Xiaofang, WANG Ying. Optimization Control of Dynamic Use of Exit-lanes for Left-turn Traffic[J]. Journal of Transport Information and Safety, 2021, 39(5): 85-92. doi: 10.3963/j.jssn.1674-4861.2021.05.011
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The design of dynamic use of exit-lanes for left-turn(EFL)traffic has been applied to many urban intersec⁃ tions. The existing EFL design and traffic control schemes are improved to solve the problems of uneven distribution of traffic flow in different lanes and low utilization rate of countercurrent lane during certain periods. A new method of the dynamic EFL design and flexible configuration is proposed. Based on the optimized length of the improved dynam⁃ ic EFL, a signal control strategy is proposed and a delay estimation model under the unconventional EFL design is al⁃ so developed. Matlab is used to compare the signal control schemes under the three scenarios: conventional setup, be⁃ fore, and after improvement. It is found that, when the left-turn flow is 400 vehicles/h, the best signal cycle of conven⁃ tional intersections should be 130 s. Under the same signal cycle, compared with the conventional and the after-im⁃ provement scenarios, the vehicle delay is found to decrease by 39.68% and 29.48%, respectively. It is also found that, when the left-turn flow reaches 500 vehicles/h, the optimal cycle of the conventional intersection is found to be 174 s. When compared with the conventional and the after-improvement scenarios, the vehicle delay is found to de⁃ crease by 12.90% and 12.02%, respectively.
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