What does subject 1 26 1 145 520 mean?

In Subject 1, 26 1, 145, 520 refer to the visibility of expressway, the maximum speed of vehicles and the minimum distance between cars in front and behind. The details are as follows: 1, 26 126 1 refers to the visibility of expressway below 200m, with the maximum speed of 60km \u002F hours. 2. 145 145 means that the visibility in expressway is below 100 meters, with a top speed of 40 kilometers per hour and a minimum distance of 50 meters. 3.520520 means that the visibility of expressway is below 50m, the top speed is 20km \u002F hours, and it leaves expressway from the nearest exit.