Abstract
The stop/go decisions at signalized intersections are closely related to driving speed during signal change intervals. The speed during stop/go decision-making has a significant influence on the dilemma area, resulting in changes of stop/go decisions and high complexity of the decision-making process. Considering that traffic delays and vehicle exhaust pollution are mainly caused by queuing at intersections, the stop-line passing speed during the signal change interval will affect both vehicle operation safety and the atmospheric environment. This paper presents a comparative study on drivers’ stop/go behaviors when facing a transition signal period consisting of 3 s green flashing light (FG) and 3 s yellow light (Y) at rural high-speed intersections and urban intersections. For this study, 1,459 high-quality vehicle trajectories of five intersections in Shanghai during the transition signal period were collected. Of these five intersections, three are high-speed intersections with a speed limit of 80 km/h, and the other two are urban intersections with a speed limit of 50 km/h. Trajectory data of these vehicle samples were statistically analyzed to investigate the general characteristics of potential influencing factors, including the instantaneous speed and the distance to the intersection at the start of FG, the vehicle type, and so on. Decision Tree Classification (DTC) models are developed to reveal the relationship between the drivers’ stop/go decisions and these possible influencing factors. The results indicate that the instantaneous speed of FG onset, the distance to the intersection at the start of FG, and the vehicle type are the most important predictors for both types of intersections. Besides, a DTC model can offer a simple way of modeling drivers’ stopping decision behavior and produce good results for urban intersections.
Highlights
At signalized intersections in most cities of China, a 3 s green flashlight (FG) indicator and a 3 s yellow light (Y) indicator are the most common form of transition signal setting [1,2,3].e current practice shows that it is reasonable to set the yellow light as 3 s for the intersection with a speed limit of less than 50 km/h
Once the speed limit is higher than 50 km/ h, the vehicle will often fall into the dilemma zone (DZ) due to the higher driving speed and insufficient yellow light duration [4,5,6,7,8]
There is no study on the specific combination of 3-second yellow light (Y) and 3second green flashlight (FG). is kind of signal combination is a unique feature of signalized intersections in Journal of Advanced Transportation
Summary
At signalized intersections in most cities of China, a 3 s green flashlight (FG) indicator and a 3 s yellow light (Y) indicator are the most common form of transition signal setting [1,2,3]. Us, for the above two intersections with different areas, the setting of green flashlight (FG) can impose other effects on the stop/go decision-making behavior of drivers. The Decision Tree Classification (DTC) models are applied to analyze how drivers’ stop decisions relate to potential influencing factors for two different types of intersections. Ree of which are highspeed intersections with a speed limit of 80 km/h in the rural area, and two of which are intersections with a speed limit of 50 km/h in the urban area We use these trajectory data, and we carried out statistical analysis to summarize the general characteristics of the potential influencing factors of the two types of the intersection, including instantaneous speed, the vehicle type, and the distance to the intersection at the beginning of FG signal. We summarize the findings of the study, point out the contribution of this study, and suggest future directions of related research
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