Abstract
To study the influence of various working conditions on traffic safety in the maintenance area of a mountain expressway, 675 groups of PTV VISSIM traffic simulation experiments were designed with various traffic organization modes, traffic volumes, traffic compositions, activity area lengths, and speed limit values. The results show that the activity area length of a closed lane, a compressed lane, and a borrowed opposite lane had no marked influence on the traffic conflicts. There was a significant positive correlation between the proportion of trucks and the number of traffic conflicts, and the number of traffic conflicts increased significantly with an increase in traffic volume. In the closed lane and borrowed opposite lane scenarios, the increase in traffic conflicts was more obvious with the increase in traffic volume. There were obvious differences in the number of traffic conflicts under different forms of traffic organization. The number of conflicts in the compressed lane scenario was the lowest, and in the borrowed opposite lane scenario the number of conflicts was the highest. There was a significant correlation between a decrease in the speed limit and an increase in the number of traffic conflicts. Finally, with traffic volume, truck proportion, and speed limit values as independent variables and reliability as a dependent variable, linear regression equations of reliability were established for three traffic organization scenarios: closed lane, borrowed opposite lane, and compressed lane.
Highlights
The expressway maintenance operation area is a typical traffic bottleneck area and an accident-prone area
Meng et al conducted a study on the characteristics of traffic conflicts in a half-closed construction area of expressways, and the results showed that under the same other conditions, when the speed limit is higher than 50 km/h, the number of traffic conflicts will increase significantly as the speed limit increases [48]
According to the Pearson correlation test, there was a significant relation between freight car proportion and traffic conflict number, and the two were positively correlated
Summary
The expressway maintenance operation area is a typical traffic bottleneck area and an accident-prone area. Carrying out the risk assessment of the safe operation of the maintenance operation area is of great significance for reducing driving safety accidents. Regarding the evaluation of the safety risks of highway maintenance work areas to improve the level of safe operation, it is mainly based on actual survey data and statistical data that allow a macro analysis and an evaluation of risks from indicators such as vehicle speed dispersion, cross-sectional vehicle speed changes, and vehicle operating speeds by vehicle type to be carried out [1,2,3,4]. Richard and Dudek’s research found that an excessively high vehicle speed is the cause of the high incidence of accidents in the maintenance work area, and the safety of the work area can be improved by speed limits [5].
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