The analysis shows that the time that passes from the start of the fire to when the exhaust fan is activated is close to 3 minutes. Finally, the abovementioned theoretical formulas are verified through the employment of model experiments. Then, according to the one-dimensional fluid mechanics model, the time rule of adjusting the airflow field in the tunnel from the normal operation stage to the emergency ventilation state is analyzed theoretically. In order to study the relevant time factors for smoke management in a highway tunnel, firstly, the logical sequence and time of the fire alarm system (FAS) startup are investigated and analyzed. Early rapid response and a reasonable smoke control plan are very important to evaluate tunnel fire performance. Fire is the most deadly risk during tunnel operation.
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