Abstract
The safety state of road network in the bridge–tunnel groups is an important factor in evaluating road traffic safety. This article describes a case study simulating brittleness behavior of road traffic safety statue in the bridge–tunnel groups. First, the safety state of road network and brittleness behavior characteristics are analyzed; second, the relationship between brittleness behavior and safety entropy is also introduced, and the collapse process of the travel system of road traffic network in the bridge–tunnel groups is simulated, which is based on the adaptive agent digraph theory. Finally, the rear-end accident data from Liu’an mountainous freeway are verified through the reasonability and feasibility of adaptive agent digraph theory. The case study has shown that there is a certain delay in the collapse of whole system; the key of vertex collapse will lead to the collapse of the whole system in a short time; the initial value of each vertex has a significant impact on the collapse of the whole system. The findings in this study provide scientific guidance to potentially improve the current mountainous freeway design and traffic management policy.
Highlights
With the rapid development of China’s national economy, especially in the implementation of the western development strategy, the mountain freeway is undergoing a period of major change and rapid development
Accompanied by a corresponding increase in motor vehicles and traffic accidents, road traffic accidents significantly increase with increased length of mountain freeway, which is a serious harm to people’s lives and property
Simulation result 3: Figure 8(c) displays that collapse of one vertex does not lead to the collapse of the whole system or only causes part of the vertices to collapse rather than collapsing all vertices, showing a shock state
Summary
With the rapid development of China’s national economy, especially in the implementation of the western development strategy, the mountain freeway is undergoing a period of major change and rapid development. The construction of freeways in mountainous area provides favorable driving conditions, which has greatly improved the transportation situation in the mountain area. It helps to promote economic development in the mountain areas and help to improve traffic– economic exchanges between west and east cities of the mountain areas. Due to the limitation by the topography and geological conditions, the bridge–tunnel groups (BTGs), such as bridges, tunnels, and the bridge–tunnel connection section, are found everywhere in the mountain freeway. It is a new challenge to improve the road traffic safety and security in the mountain freeway. It is a major topic to study the traffic safety of BTGs in mountainous freeway
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