Abstract
This paper proposes a signal control method for the through and left-turn shared lanes at signalized intersections to solve traffic conflicts between left-turn vehicles and opposing through vehicles by setting left-turn waiting area (LWA). Delays and stops are weighted to form an integrated performance index (PI) in a vehicle-to-infrastructure cooperation system. The PI models pertaining to all vehicles are established based on the LWA intersection. In addition, an optimized method of signal timing parameters is constructed by minimizing the average PI. VISSIM simulation shows that the average PI decreases by 6.51% compared with the original layout and signal timing plan of the intersection, since the increased delay of the side-road left-turn vehicles is insufficient to offset the reduced delay of the side-road through vehicles after the improvement. The sensitivity analysis shows that the greater the traffic volume of the phase including the through and left-turn shared lanes, the higher the operation efficiency of the LWA intersection compared with the typical permitted phase intersection. When the left-turn vehicles of the shared lanes in each cycle are less than the stop spaces, the LWA intersection can effectively reduce the average PI of the shared lanes. Furthermore, the more the stop spaces in the LWA, the lower the average PI in the same traffic conditions.
Highlights
To fully utilize the space–time resources of intersections, waiting areas have been implemented to improve the traffic efficiency of signalized intersections in many cities, including left-turn waiting areas (LWAs) and through waiting areas
We have developed an algorithm using the component object model (COM) interface of VISSIM to measure the mobility performance and connect the customized signal control method with the VISSIM traffic light controller
Each scheme is simulated for 60 min, and the results are shown in Tables 2–4, where the average performance index (PI), delay, and stop rate are used for performance evaluation
Summary
To fully utilize the space–time resources of intersections, waiting areas have been implemented to improve the traffic efficiency of signalized intersections in many cities, including left-turn waiting areas (LWAs) and through waiting areas. Wu et al [11] propose the contraflow left-turn lane (CLL) and evaluate the effects of CLLs on left-turn traffic performance at signalized intersections. The random arrival of left-turning vehicles of the through and left-turn shared lane per cycle is not considered in the signal timing method of intersections, resulting in the inaccuracy of the delay model. A LWA design and dynamic signal optimized method for the through and left-turn shared lanes is proposed to solve traffic conflicts and improve the traffic efficiency at signalized intersections. 3 of (2) Both stops and delays are weighted to form an integrated performance index (PI) du to increasing stops for left-turn vehicles at LWA intersection, and the of PI17 models pe taining to all vehicles are established to calculate the delay and stops in accuracy.
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