Abstract
This paper develops an integrated optimization of traffic signals and vehicle trajectories. The signal is optimized to improve the intersection efficiency and the calculation of intergreen interval (IGI) serves as constraints to guarantee vehicle safety during signal changing. Then the vehicle trajectory in the approach lane and inside intersection is optimized to increase fuel efficiency. The proposed method is evaluated by microscopic simulation, comparing with the actuated signal control (ASC) method and an ad hoc cooperation method between traffic signals and vehicles. Results indicate the proposed control algorithm is effective to prevent conflicts during signal changing periods. Operation Efficiency and fuel efficiency are improved. The benefit is 24.9% on vehicle delay, and is 5.5% on fuel efficiency. The proposed system can potentially be used in real-time.
Highlights
Accidents at intersections have been a serious problem
intergreen interval (IGI) is generally defined as the interval between the end of the green time of the last traffic stream and the beginning of the green time of the [6]
Overlong IGI is a waste of time [7]
Summary
Accidents at intersections have been a serious problem. Researches show 22% of total crashes happen at intersections in the United States [1] and around 30% of urban traffic accidents took place at or near signalized intersections in China [2]. Signalized intersections play a significant role in the urban roadway network [3], [4]. The present study avoids vehicle collisions at signalized intersections through precise signal control, most notably by optimizing intergreen interval (IGI) [5]. IGI is generally defined as the interval between the end of the green time of the last traffic stream and the beginning of the green time of the [6]. The design of IGI should be optimized for efficiency and ensuring safety
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