Secondary highway: subgrade width is not less than 12m, and pavement width is not less than 9m; When restricted, the subgrade width is not less than 8.5 meters, and the pavement width is not less than 7.5 meters.
Class III highway: subgrade width is not less than 8.5m, and pavement width is not less than 7m; When restricted, the subgrade width is not less than 7.5 meters, and the pavement width is not less than 6.5 meters.
Class-IV highway: subgrade width is not less than 6.5m, and pavement width is not less than 5m.
Village road: subgrade width is not less than 5.5 meters, and pavement width is not less than 4.5 meters.
The standard of secondary highway is that the subgrade width is not less than12m, and the pavement width is not less than 9m; In the case of limited terrain or financial resources, the subgrade width is not less than 8.5 meters, and the pavement width is not less than 7.5 meters. The standard of third-class highway is that the subgrade width is not less than 8.5 meters and the pavement width is not less than 7 meters; When restricted, the subgrade width is not less than 7.5 meters, and the pavement width is not less than 6.5 meters. The standard of Grade IV highway is that the subgrade width is not less than 6.5 meters and the pavement width is not less than 5 meters. The standard of village road is that the subgrade width is not less than 5.5 meters and the pavement width is not less than 4.5 meters. These standards ensure the capacity and safety of rural roads.
Highway design standard:
1, design speed: determine key parameters such as highway alignment, longitudinal slope and horizontal curve radius;
2. The number of lanes: determined according to the traffic volume and service level, which affects the traffic capacity of the highway;
3. Pavement structure: including asphalt concrete and cement concrete, which affects the durability and comfort of the highway;
4. Drainage system: ensure smooth drainage of pavement and prevent water from damaging subgrade and pavement;
5. Traffic safety facilities: including signs, markings, guardrails, etc. Improve driving safety;
6. Environmental protection measures: reduce the impact of highway construction and use on the environment.
To sum up, the setting of the standard width of rural roads ensures the capacity and safety of rural roads.
Legal basis:
People's Republic of China (PRC) Highway Law
Article 6
According to their position in the road network, highways are divided into national roads, provincial roads, county roads and township roads, and according to their technical levels, they are divided into expressway, first-class highways, second-class highways, third-class highways and fourth-class highways. The specific division standard shall be stipulated by the transportation department of the State Council. New highways should meet the technical grade requirements. Existing roads that do not meet the requirements of the minimum technical grade shall take measures to gradually transform them into roads that meet the requirements of the technical grade.