What are secondary roads specifically referring to those types of roads

The so-called national highway, provincial highway, refers to the administrative level of the highway, the national highway is planned by the Ministry of Communications, connecting the country's important cities, in the same way, the provincial highway is the provincial transportation department planning, connecting the province's important cities.

The so-called expressway, a first-class highway.

Secondary roads refer to the technical grade of the road, such as the exclusive use of cars and four lanes in both directions.

The above can be considered a highway.

Therefore, national highways can be highways, first-class highways or even second-class roads, and provincial highways may also be highways or first-class highways. For example, in Jiangsu, because the national highway was built early and the technical level is low, many of them are first-class highways, and many provincial roads are highways.

Which roads are secondary roads can go to the local highway department, in the eastern region.

Generally, the secondary roads are county and township roads, with 2 lanes in both directions. At present, many provinces and counties in the eastern region are highways between counties.

Technical standards. There are two types of secondary roads: automobile secondary roads and general secondary roads. The special secondary road for automobiles can adapt to the annual average day and night traffic volume of 4,500 to 7,000 medium-sized trucks converted into various vehicles (including motorcycles), and the general secondary highway can adapt to the annual average day and night traffic volume of 2,000 to 5,000 medium-sized trucks converted into various vehicles.

The width of the roadbed of the secondary road is generally 13 meters and 9 meters for the secondary road for automobiles, and 15 meters and 10 meters for the general secondary road. Secondary roads are mostly two- to six-lane roads in both directions, with a speed limit of 40 to 80 kilometers per hour. [1]

Basic features: 1. In the pavement design requirements, it is allowed not to set up ** isolation belt (** separation belt can be added according to the actual situation), 2] When there is no ** isolation belt, double yellow line, single yellow line or single yellow dotted line should be set; [3]

2. Retain a large number of level intersections to facilitate close communication between residents along the line;

3. Mixed conditions of motor vehicles, non-motor vehicles, pedestrians, etc. are allowed;

4. The minimum number of lanes is required to be two-way two-lane, with two-way four-lane in the majority;

5. Taking into account efficiency and safety considerations, the speed limit is 40km h-80km h.

According to the "Technical Standards for Highway Engineering" (JTG B01-2003):

Secondary roads are two-lane roads for motorized vehicles. The two-lane secondary highway should be able to adapt to the annual average daily efficiency of 5,000 to 15,000 passenger cars.

Secondary highway design speed this 60 80km h. <>