摘要：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.
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