(1) High-grade pavement or sub-high-grade pavement with six or more motor vehicle lanes;
(2) High-grade or sub-high-grade pavements with four or more motor vehicle lanes and non-motor vehicle lanes with green belts.
2. Airport runways and aprons.
3. Bridges and culverts:
(1) Overpass and pavement with the highest height of the second floor or bridge deck of 16m;
(2) Single-span project with a span of Lo≥40m;
(3) Multi-span project with total length L≥ 100m.
4. Drainage works with maximum pipe diameter DN≥ 1200mm and total length L≥ 1200m.
5. Water supply project with maximum pipe diameter DN≥ 1000mm and total length L≥ 1000m.
6. Mechanical pipeline engineering and open caisson engineering with maximum box width ≥6m.
7. Gas engineering with maximum pipe diameter DN≥630mm.
8. Flood control wall works with a height exceeding 3m and a thickness exceeding1m..
9. Tunnel project with 9.B0 section with clear width ≥90m.
Legal basis: municipal engineering classification and distribution standards
The first category of projects:
1. Road works:
(1) High-grade pavement or sub-high-grade pavement with six or more motor vehicle lanes;
(2) High-grade or sub-high-grade pavements with four or more motor vehicle lanes and non-motor vehicle lanes with green belts.
2. Airport runways and aprons.
3. Bridges and culverts:
(1) Overpass and pavement with the highest height of the second floor or bridge deck of 16m;
(2) Single-span project with a span of Lo≥40m;
(3) Multi-span project with total length L≥ 100m.
4. Drainage works with maximum pipe diameter DN≥ 1200mm and total length L≥ 1200m.
5. Water supply project with maximum pipe diameter DN≥ 1000mm and total length L≥ 1000m.
6. Mechanical pipeline engineering and open caisson engineering with maximum box width ≥6m.
7. Gas engineering with maximum pipe diameter DN≥630mm.
8. Flood control wall works with a height exceeding 3m and a thickness exceeding1m..
9. Tunnel project with 9.B0 section with clear width ≥90m.
Article 2 Category II projects:
1. Road works: high-grade pavement or sub-high-grade pavement with four or more motor vehicle lanes.
2. Bridges and culverts:
(1) Overpasses and pavements with the highest height of the first floor or bridge deck less than 16m.
(2) Single span Lo≥20m；;
(3) Bridge and culvert engineering with multi-span length L≥70m.
3. Drainage works with maximum pipe diameter DN≥ 1000mm and total length L≥ 1000m.
4. Water supply project with maximum pipe diameter DN≥600mm and total length L ≥ 800 m. ..
5. Gas engineering with maximum pipe diameter DN≥325mm.
6. Open channels, culverts and intercepting ditches have separate flood discharge works.
7. Tunnel project with net section width Bo≥7m.
8. Urban road lighting engineering.
9. Flood control wall with height less than 3m and thickness less than1m..
Article 3 Three types of projects:
1. Road engineering of concrete and asphalt concrete pavement for two or more motor vehicles.
2. Bridges and culverts:
(1) Bridge and culvert works with single span Lo≥ 10m;
(2) Multi-span bridge and culvert project with total length L≥30m.
3. Drainage works with the largest pipe diameter DN≥500mm and the total length L≥500m.
4. Water supply project with maximum pipe diameter DN≥300mm and total length L≥400m.
5. Maximum pipe diameter DN6. Independent revetment and slope protection works with riprap gabions for bottom protection and corresponding ancillary works of earthwork.
7. Net section width Bo8. Masonry trench with cross-sectional clearance area So≥4m2.
Article 4 Four categories of projects:
1. Road works:
(1) Works under two motor vehicle lanes (excluding expressway);
(2) Separate sidewalks.
2. Bridges and culverts:
(1) Single span Lo(2) Total length L3 of multiple spans. Maximum pipe diameter DN4. Maximum pipe diameter DN5. Earth embankment project.
6. Cross-sectional clearance area So