What is the minimum speed limit on national highways?

[SanWilliam]

The speed limit standard for national highways is 60-80km/h. Below is a partial introduction to national highways: 1. Road conditions: (1). Highways: Around 110 km/h is the most fuel-efficient, with low wind noise, fuel consumption around 6.5 liters, with air conditioning on, adding about 0.5 liters. (2). Normal roads on provincial and national highways: Fuel consumption is normally around 8 liters, with speeds between 80 km/h and 60 km/h. 2. Urban areas: Fuel consumption is slightly higher, with traffic lights, fuel consumption ranges from 9 to 10 liters, and in traffic congestion, fuel consumption is normally above 10 liters. 3. Driving habits: Normal driving results in slightly lower fuel consumption; otherwise, fuel consumption is higher. Frequently driving at high gears with low speeds or low gears with high speeds will both increase fuel consumption.