Abstract
The larger the proportion of truck traffic volume, the greater the impact on traffic efficiency, and overtaking behavior will also have an impact. Therefore, in order to clarify the truck traffic volume of the freight two-lane highway due to the difficulty of overtaking, an actual vehicle test is carried out. This involves selecting the appropriate two-lane test section, recording each moment and speed in the driver’s overtaking behavior, performing multiple regression analysis to examine the relationship between the overtaking conflict time and design speed and traffic volume, determining a reasonable evaluation series of two-lane road overtaking risk and the corresponding overtaking conflict time threshold by the Fisher optimal segmentation method, and giving an overtaking behavior risk evaluation method based on conflict time. Finally, according to the overtaking conflict time model, different truck traffic conditions are obtained. The research results show that overtaking conflict time is negatively correlated with the traffic volume and design speed of the lane. Through the risk assessment of the corresponding overtaking behavior, the three levels of serious conflict, general conflict and non-conflict are determined, and the freight traffic volume corresponding to different conflict levels at different speeds is calculated, which provides a reference for setting auxiliary lanes for the two-lane freight highway.
Highlights
At the end of 2019, the national highway mileage of Grade 4 or above was 4.6987 million kilometers, which laid a foundation for China’s cargo road transport
According to the statistical analysis of actual vehicle test data, it can be seen that the driving speed of the vehicle during actual driving is about 80% of the design speed, and the driving speed of the vehicle during overtaking is about 85% to 90% of the design speed
The normal driving speed in Equation (8) can be equivalent to 80% of the design speed, the overtaking speed is equivalent to 85% of the design speed, and the speed of returning to the original lane after overtaking is equivalent to 90% of the design speed
Summary
At the end of 2019, the national highway mileage of Grade 4 or above was 4.6987 million kilometers, which laid a foundation for China’s cargo road transport. Due to the related factors of trucks, such as their long body, poor acceleration and deceleration performance, and so on, the proportion of freight accidents is high, including truck accidents off road These account for relatively high fatality rates, which seriously affect citizens’ life and property rights and interests, and affects the safety of production and orderly development of the transportation system. There are few studies on the risk assessment of overtaking behavior in freight two-lane highways in China and abroad, let alone the impact of traffic flow on overtaking behavior. These studies are usually based on data obtained by simulation means, and they lack calibration of measurement data. Combined with the traffic volume model, the traffic volume conditions of trucks with auxiliary lanes on a freight two-lane highway is calculated, which provides support for setting auxiliary lanes in two-lane freight roads
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