There is not theoretical reference for position judgment standard for free fast passing channel of tunnel toll gate. Hence, a new position judgment method for free fast passing channel of tunnel toll gate is proposed based on queuing theory by taking Jiaozhou Bay Tunnel for example. Meanwhile, the lane length conversion correction model and lane length and area conversion correction model are put forward, and the theoretical value and modification value of the judgment of free fast passing channel of tunnel toll gate are obtained. The research results can provide theoretical support for relevant regulations on free fast passing of tunnel toll gate and provide reference for similar tunnel and highway projects in the future.