What is the most appropriate speed to drive on national highways?

[DiDamian]

National highways are most suitable for driving at speeds of 60-80 km/h. Here is an introduction to national highways: 1. Introduction: National highways refer to main trunk roads with national political and economic significance. 2. Composition structure: (1) Trunk roads connecting the capital to the political and economic centers of provinces, cities, and autonomous regions, as well as cities with a population of over 300,000. (2) Trunk roads leading to major ports, railway hubs, and important industrial and agricultural production bases. (3) Trunk roads connecting large and medium-sized cities to important foreign trade ports, open cities, historical cities, and major scenic areas. (4) National defense trunk roads of significant importance. These road lines form the framework of the national highway network.