Abstract: To avoid secondary disaster caused by subsequent vehicles when a sudden emergency occurs in tunnel, a vehicle safety barrierfree blocking technology based on the Tyndall effect is proposed. By analyzing the mechanism of the Tyndall effect, the control parameters of the smoke generator and laser that form a stable barrier free effect for vehicles with the Tyndall effect on road sections are studied. The results show the following: (1) The pressure required for the nozzle of the smoke system increases with increasing resistance wind speed, and the larger the nozzle deflection angle, the larger is the required injection pressure. (2) According to the human eye persistence effect, there is a proportional relationship between the laser scanning speed that forms the Tyndall effect and the tangent value of the scanning angle. (3) The thinner the smoke, the more obvious the Tyndall effect and the light screen blocking information presented, and the farther is the recognition distance. Based on the tendentious research, it is shown that the light smoke vehicle blocking technology proposed based on the Tyndall effect has the advantages of obvious and easy identification of blocking information and acceptance by the public.

Key words: tunnel safety, Tyndall effect, vehicle blocking, barrierfree blocking, intelligent management and control