Dacheng Safety

This book focuses on the safety risks of long road tunnels in megacities under extreme scenarios, using traffic flow theory as a basis and microscopic traffic simulation to analyze risk characteristics and preventive measures under different conditions. Its distinctive value lies in extending tunnel safety from the level of engineering structures to that of traffic operations, emphasizing the necessity of setting emergency lanes in long tunnels and pointing out the inadequacy of current standards in dealing with such scenarios, which gives it strong practical relevance and policy reference value. The book also calls for greater attention to safety risk prevention in urban underground structures, with a vision not limited to a single facility. It is suitable for practitioners and researchers in fields such as traffic planning, municipal construction, and emergency management, and can also provide problem awareness for upper-level students in related majors. When reading, it is advisable to think in comparison with local tunnel operations and current standards, pay attention to the logical chain between simulation methods and conclusions, and avoid simply generalizing conclusions drawn under specific conditions.