What does the white road marking '80' mean?

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White '80' markings generally appear on highways, indicating that the minimum speed here is 80 kilometers per hour. Below is extended information about road speed limits: 1. White markings: White indicates the minimum speed limit. 2. Yellow markings: Yellow indicates the maximum speed limit - a yellow '80' means the maximum speed is limited to 80. 3. Other markings: The average speed on highways is above 80 km/h, with maximum speeds reaching 120 km/h, which is 60%-70% higher than regular roads. Blue background with white circle indicates minimum speed requirements with a bowl-like white pattern below the number, while red circle with white background and black numbers indicates maximum speed limits. Combined with the minimum speed limit signs, remember it as 'red high, blue low'.