What's the difference between national highway and provincial highway?

The difference between national highway and provincial highway is as follows:

1, which have different properties:

National highway refers to the main trunk highways with national political and economic significance, including important international highways, national defense highways, highways connecting the capital with the capitals of provinces, autonomous regions and municipalities directly under the Central Government, and highways connecting major economic centers, port hubs, commodity production bases and strategic locations.

Provincial highway is a provincial trunk highway. In the provincial highway network, it has provincial political, economic and national defense significance, and has been determined as a provincial trunk highway by the unified planning of provinces, municipalities and autonomous regions.

2. The road numbers of the two are different:

The national highway 1, 2 and 3 start, the capital radiation 1 starts (except the national highway 1 12), the north-south line 2 starts, and the east-west line 3 starts. 1×××× stands for radial national highway with Beijing as the center, 2×××× stands for north-south national highway, and 3××××× stands for east-west national highway. Start with the capital letter g.

A dart consists of radiation (starting with 1), vertical line (starting with 2), horizontal line (starting with 3), vertical tie line (starting with 4), horizontal tie line (starting with 5) and loop line (starting with 6). Start with the capital letter s.

3. These two levels are different:

Expressway can be national highway, provincial highway, county road or even township road. National highways can also be expressways, first-class highways, second-class highways, third-class highways and even fourth-class highways.

National highways generally need to meet the standards above the second-class highway. However, in real life, most expressways are roads above the provincial highway, so there are basically national highway number signposts with red background and white letters beginning with G or provincial highway number signposts with black letters beginning with S on yellow background, both of which essentially refer to national highways and provincial highways in the expressway network.