We have studied the traffic flow change rule of multi-lane freeway tunnel, obtained the traffic flow characteristic, established the relation model, and provided the theory support for the management and control of multi-lane freeway tunnel. We collected data of traffic flow in six typical sections, and analyzed the relationship among operating speed, traffic volume, time headway and mixing rate of large vehicles. It is found that the inner lane has the highest running speed and decreases outwards. The higher the speed is, the greater the speed difference is. The speed of 85 bit is negatively correlated with the mixing rate of large vehicles, and the correlation is significant. The traffic composition of different lanes is quite different, especially the inner lane, which is mainly composed of small buses. It is different from the traffic flow characteristics of other lanes, but the overall trend is consistent. We put forward the speed control strategy when the mixing rate of large vehicles is high, which effectively improves the safety and efficiency of multi-lane freeway tunnel.

CICTP