Why is there a traffic jam on Shaxi Expressway?

Traffic accidents, low visibility and other weather effects. According to the life network query.

1. Traffic accident: Once there is a traffic accident on the expressway, all lanes will be blocked. If there is a traffic accident between big cars, the traffic jam will last longer.

2. Weather influence such as low visibility: The expressway is greatly influenced by the external environment, and it is easy to cause traffic jams in low visibility weather such as fog and heavy snow.