What are the weather symbols of the three horizontal lines?

Three horizontal lines represent "fog" in weather symbols. When a large number of water droplets or ice crystal particles suspended in the air near the ground make the horizontal visual distance drop below 1000 meters, it is called fog. Fog is actually a cloud on the ground, and clouds are fog in the air. Fog is a weather phenomenon near the ground, which often brings disaster to aviation, navigation and road transportation.

1. In highway traffic accidents, traffic accidents caused by bad weather such as dense fog account for about a quarter of the total. Fog weather is easy to cause traffic accidents, which not only hinders traffic, but also causes great losses to the country and people's lives and property.

2. In the section with heavy traffic flow, foggy weather may lead to serious traffic congestion, especially in some areas with developed road networks and high traffic intensity, which may cause the operation of regional road networks to be blocked or even paralyzed.