Strong wind, hail and other strong convective weather can also have a greater impact on traffic, the wind can cause serious damage to buildings, traffic facilities, and so on. When the motor vehicle is overturned by the wind, the ability of the car to drive in the wind and the ability to catch the tires is obviously weakened. According to the theory of wind pressure, the square of the wind speed is proportional to the wind area. When the body wide side is subjected to wind, the force is the largest. The wind speed is above 12m/s, the steering wheel is easy to malfunction and should slow down slowly; the critical wind speed of the highway accident is often 15m/s, the corresponding gust can reach 22m/s. If it is accompanied by rain, the car is more difficult to control.
The wind can cause harm to the railway, bridge, communication and electric power facilities, blow down the road tree, block the traffic, wind up the roadbed, and blow the sand to reduce the visibility. The wind can also directly harm the train so that the speed of the train is slowed down and the train is even overturned. The influence of wind on the water traffic is especially obvious, especially in the open area of water. The ship is not too late to enter the shelter area and often causes the ships to be blown by the wind and so on. Hail can also cause damage to motor vehicles and road traffic facilities, but often hail has a smaller range, short impact time and less influence on traffic than other weather phenomena. Thunderstorms also threaten the safety of transportation facilities, bridges and so on.