How are the highway grades in China classified?

At present, according to the traffic volume, tasks and functions of roads, domestic highways are divided into five grades, namely, expressway, first-class highways, second-class highways, third-class highways and fourth-class highways.

1, expressway

At present, the highest grade highway in China is expressway, which is also the only highway that can meet the speed of120km/h/h. expressway refers to the highway that can accommodate 25,000 passenger cars day and night on average. The pavement width exceeds four lanes, and its service life is only 20 years. On the expressway, pedestrians and non-motor vehicles are not allowed to get on.

2. First-class highway

Generally, all kinds of cars (including motorcycles) that can adapt to 65,438+00,000 ~ 25,000 can be converted into the annual average day and night traffic volume of passenger cars. It is a expressway connecting important political and economic centers and leading to key industrial and mining areas, ports and airports. It is specially designed for cars to drive alone and partially control their traffic.

3. Secondary roads

There are two kinds of special secondary roads for automobiles and general secondary roads. The special secondary road for automobiles can adapt to the average annual day and night traffic volume of medium-sized trucks modified by various automobiles (including motorcycles) of 4,500-7,000, and it is the road connecting automobiles with political and economic centers or large industrial and mining areas, ports, airports and other places.

4. Class III highway

Class III highway is generally applicable to the annual average day and night traffic volume of medium-sized trucks with less than 2000 vehicles modified from various vehicles. Roads connecting cities at or above the county level.

The Technical Standard for Highway Engineering stipulates that the third-class highway is two lanes. The width of subgrade in plain hilly area is 8.5m, and that in mountainous hilly area is 7.5m.. The service life of Grade III highway is 10 year.

5. Class IV highway

Generally, it can adapt to the long-term design life of all kinds of vehicles converted into medium-sized trucks, and the annual average day-and-night traffic volume is: 1500 vehicles below two lanes; There are less than 200 cars in a single lane.

The highway grade selection of the expanded data is comprehensively determined according to the highway network planning, the use task, function and future traffic volume of the highway; On the same expressway, different car fatigue numbers or different highway grades can be adopted according to the traffic volume and other conditions.

According to the administrative level, highways can be divided into five grades: national highway, provincial highway, county road, township road (referred to as national, provincial and township road) and special highway. General national and provincial roads are called trunk lines, and county and township roads are called branch lines.

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. The inter-provincial expressway in the national highway is responsible for the construction, maintenance and management by the specialized agencies approved by the Ministry of Communications.

Refer to China Highway Network Highway Grade _ Baidu Encyclopedia