1.0.1 This code is especially formulated with a view to exactly applying "Technical Standard of Highway Engineering" (JTG B01—2003) and reasonably determining the highway classification, construction scale and the key technical indexes.
1.0.2 This specification is compiled according to the fundamental rules and the key technical indexes on the highway classification, control factors, path and path crossing specified in "Technical Standard of Highway Engineering" (JTG B01—2003).
1.0.3 This specification applicable to path and path cross-over design of the constructed and renovated highways.
1.0.4 The highway design shall reasonably determine the highway classification and the path direction and corridor according to the highway functions, tasks and its actions in road net, and also considering the relation of the transportation modes such as railway, waterway, aviation and pipeline with the town and farm planning.
1.0.5 Based on the selected corridor zone and principal control points, the route scheme shall have the layout and overall design, reasonably apply the technology indexes, compare and select among the feasible route schemes to determine the design scheme. When adopting different design road speeds, technology indexes or design schemes have significant difference in engineering costs, natural environment and socioeconomic performance, the technical and economic demonstration of same depth shall be carried out.
1.0.6 The selection of route shall select the route position and main horizontal and longitudinal technology indexes according to the torography and ground object conditions based on the adequate survey on engineering geology, hydrological geology, and natural disaster at mountains, road materials, ecological environment and natural landscapes.
1.0.7 The route design must go through with the fundamental national policies of strengthening the environmental protection and rationally using the land resources; in the design of determining the structural shapes, installation positions of such manual structure as subgrade, pavement, bridge, tunnel, intercrossing, traffic engineering and on-line facilities, soil collecting and dumping ground, and the requisition of land, the influence on the on-line ecological environment caused by the highway construction shall be reduced, combining with the landscaping or adopting corresponding engineering measures to coordinate and improve the cooperation between manual structures and on-line natural landscapes, and improve the environmental quality of highway.
1.0.8 The geometric design shall comprehensively consider the relations among the plane, vertical section and cross section of the highway to achieve the straight plane, uniform vertical section and reasonable cross section. And the highway perspective drawing may be adopted for analyzing and assessment if necessary.
1.0.9 The highways of different classes shall lay stress on geometric design to make them be able to guide the visual line visually, make people feel comfortable and safe mentally, and shall keep the linear continuity and be coordinated with on-line environment. The connected position of sections with different speeds or the sections with geometric design being restricted for the restriction of conditions should adopt the operating velocity for inspection with a view to improving the horizontal and longitudinal technology indexes or should be adopted with necessary traffic safety technology and control measures.
1.0.10 The expressway and arterial highway after completion of design, or after operation and in reconstruction should have the safety assessment with a view to improving the safety of travelling.
1.0.11 When adopting the construction scheme by stages, the overall design and implementation plan must be worked out based on comprehensive analysis and demonstration. The construction design by stages shall be able to make the engineering in preliminary stage be still able to fully used at later stages, and shall leave space and creation advantages for the engineering in later stages.
According to factors such as road net planning or traffic volume, the expressway should be constructed by adopting the longitudinal subsections or according to the construction mode of engineering projects by stages. The section with integral subgrade in the four-lane expressway shall not adopt the transverse framing staged construction.
1.0.12 The reconstructed highway shall reasonably and fully used the original engineering conforming to the principle of combination of utilization and renovation according to the specified technology index of highway classification.
With using the sections of the original highway, when the improvement of design road speed may induce engineering geologic diseases, this partial section may maintain the indices of the original design through justification. As for the relocation of sections, it shall be implemented according to the standards of newly-built highway.
1.0.13 In the survey and design of highway engineering, such aspects on highway classification, key technical indexes, route design, and route cross-over design shall not only comply with this specification, but also shall comply with those specified in the related state's current compulsory standards.
Contents 1. General Provisions 2 Highway Grading and Grade Adoption 2.1 Highway Grading 2.2 Adoption of Highway Grade and Design Speed. 2.3 Control of Egress and Ingress 3 Highway Capacity 3.1 General Provisions 3.2 Traffic Capacity of Freeway 3.3 Traffic capacity of Arterial Highway 3.4 Traffic Capacity of the Secondary and Tertiary Highway 4 Overall Design 4.1 General Provisions 4.2 Keys of Overall Design 5 Route Selection 6 Highway Cross-section 6.1 General Provisions 6.2 Lane 6.3 Intermediate zone 6.4 Shoulder 6.5 Crown Slope 6.6 Highway Construction Limit 6.7 Scope of Highway Land 7 Highway Plane 7.1 General Provisions 7.2 Straight Line 7.3 Circular curve 7.4 Circling Line 7.5 Super-elevation of Circular Curve 7.6 Widening of Circular Curve 7.7 Transition Section of Super-elevation and Widening 7.8 Length of Horizontal Curve 7.9 Sight distance 7.10 Hairpin Curve 8 Highway Vertical Section 8.1 General Provisions 8.2 Longitudinal Slope 8.3 Slope Length 8.4 Climbing Lane 8.5 Composite Gradient 8.6 Vertical Curve 9 Geometric Design 9.1 General Provisions 9.2 Plan alignment Design 9.3 Longitudinal Alignment Design 9.4 Cross Section Design 9.5 Alignment Combinational Design 9.6 Coordination of Alignment and Bridge/tunnel 9.7 Conjugation of Alignment and Along- facilities. 9.8 Harmonization of Alignment and Environment 10 Highway and Highway Grade Crossing 10.1 General Provisions 10.2 Alignment of Road at the Grade Crossing 10.3 Sight Distance 10.4 Turning Design 10.5 Auxiliary Lanes and Traffic Island 10.6 Reconstruction of the Grade Intersection 11 Highway and Highway over Crossing 11.1 General Provisions 11.2 Sight Distance 11.3 Ramp Design 11.4 Quantity of Basic Lanes and Equalization of Lane Quantity 11.5 Bifurcation and Converging of Mainline and Diverging and Converging among Ramps 11.6 Grade Crossing in Traffic Interchange 11.7 Separate Grade Separation 12 Intersections between Highways and Railways/country roads/pipelines 12.1 General Provisions 12.2 Highway and Railway Interchange 12.3 Highway and Railroad Grade Crossing 12.4 Highway and Country Road Intersection 12.5 Highway and Pipeline Intersection Wording Explanations
Standard
JTG D20-2006 Design Specification for Highway Alignment (English Version)
1.0.1 This code is especially formulated with a view to exactly applying "Technical Standard of Highway Engineering" (JTG B01—2003) and reasonably determining the highway classification, construction scale and the key technical indexes.
1.0.2 This specification is compiled according to the fundamental rules and the key technical indexes on the highway classification, control factors, path and path crossing specified in "Technical Standard of Highway Engineering" (JTG B01—2003).
1.0.3 This specification applicable to path and path cross-over design of the constructed and renovated highways.
1.0.4 The highway design shall reasonably determine the highway classification and the path direction and corridor according to the highway functions, tasks and its actions in road net, and also considering the relation of the transportation modes such as railway, waterway, aviation and pipeline with the town and farm planning.
1.0.5 Based on the selected corridor zone and principal control points, the route scheme shall have the layout and overall design, reasonably apply the technology indexes, compare and select among the feasible route schemes to determine the design scheme. When adopting different design road speeds, technology indexes or design schemes have significant difference in engineering costs, natural environment and socioeconomic performance, the technical and economic demonstration of same depth shall be carried out.
1.0.6 The selection of route shall select the route position and main horizontal and longitudinal technology indexes according to the torography and ground object conditions based on the adequate survey on engineering geology, hydrological geology, and natural disaster at mountains, road materials, ecological environment and natural landscapes.
1.0.7 The route design must go through with the fundamental national policies of strengthening the environmental protection and rationally using the land resources; in the design of determining the structural shapes, installation positions of such manual structure as subgrade, pavement, bridge, tunnel, intercrossing, traffic engineering and on-line facilities, soil collecting and dumping ground, and the requisition of land, the influence on the on-line ecological environment caused by the highway construction shall be reduced, combining with the landscaping or adopting corresponding engineering measures to coordinate and improve the cooperation between manual structures and on-line natural landscapes, and improve the environmental quality of highway.
1.0.8 The geometric design shall comprehensively consider the relations among the plane, vertical section and cross section of the highway to achieve the straight plane, uniform vertical section and reasonable cross section. And the highway perspective drawing may be adopted for analyzing and assessment if necessary.
1.0.9 The highways of different classes shall lay stress on geometric design to make them be able to guide the visual line visually, make people feel comfortable and safe mentally, and shall keep the linear continuity and be coordinated with on-line environment. The connected position of sections with different speeds or the sections with geometric design being restricted for the restriction of conditions should adopt the operating velocity for inspection with a view to improving the horizontal and longitudinal technology indexes or should be adopted with necessary traffic safety technology and control measures.
1.0.10 The expressway and arterial highway after completion of design, or after operation and in reconstruction should have the safety assessment with a view to improving the safety of travelling.
1.0.11 When adopting the construction scheme by stages, the overall design and implementation plan must be worked out based on comprehensive analysis and demonstration. The construction design by stages shall be able to make the engineering in preliminary stage be still able to fully used at later stages, and shall leave space and creation advantages for the engineering in later stages.
According to factors such as road net planning or traffic volume, the expressway should be constructed by adopting the longitudinal subsections or according to the construction mode of engineering projects by stages. The section with integral subgrade in the four-lane expressway shall not adopt the transverse framing staged construction.
1.0.12 The reconstructed highway shall reasonably and fully used the original engineering conforming to the principle of combination of utilization and renovation according to the specified technology index of highway classification.
With using the sections of the original highway, when the improvement of design road speed may induce engineering geologic diseases, this partial section may maintain the indices of the original design through justification. As for the relocation of sections, it shall be implemented according to the standards of newly-built highway.
1.0.13 In the survey and design of highway engineering, such aspects on highway classification, key technical indexes, route design, and route cross-over design shall not only comply with this specification, but also shall comply with those specified in the related state's current compulsory standards.
Contents of JTG D20-2006
Contents
1. General Provisions
2 Highway Grading and Grade Adoption
2.1 Highway Grading
2.2 Adoption of Highway Grade and Design Speed.
2.3 Control of Egress and Ingress
3 Highway Capacity
3.1 General Provisions
3.2 Traffic Capacity of Freeway
3.3 Traffic capacity of Arterial Highway
3.4 Traffic Capacity of the Secondary and Tertiary Highway
4 Overall Design
4.1 General Provisions
4.2 Keys of Overall Design
5 Route Selection
6 Highway Cross-section
6.1 General Provisions
6.2 Lane
6.3 Intermediate zone
6.4 Shoulder
6.5 Crown Slope
6.6 Highway Construction Limit
6.7 Scope of Highway Land
7 Highway Plane
7.1 General Provisions
7.2 Straight Line
7.3 Circular curve
7.4 Circling Line
7.5 Super-elevation of Circular Curve
7.6 Widening of Circular Curve
7.7 Transition Section of Super-elevation and Widening
7.8 Length of Horizontal Curve
7.9 Sight distance
7.10 Hairpin Curve
8 Highway Vertical Section
8.1 General Provisions
8.2 Longitudinal Slope
8.3 Slope Length
8.4 Climbing Lane
8.5 Composite Gradient
8.6 Vertical Curve
9 Geometric Design
9.1 General Provisions
9.2 Plan alignment Design
9.3 Longitudinal Alignment Design
9.4 Cross Section Design
9.5 Alignment Combinational Design
9.6 Coordination of Alignment and Bridge/tunnel
9.7 Conjugation of Alignment and Along- facilities.
9.8 Harmonization of Alignment and Environment
10 Highway and Highway Grade Crossing
10.1 General Provisions
10.2 Alignment of Road at the Grade Crossing
10.3 Sight Distance
10.4 Turning Design
10.5 Auxiliary Lanes and Traffic Island
10.6 Reconstruction of the Grade Intersection
11 Highway and Highway over Crossing
11.1 General Provisions
11.2 Sight Distance
11.3 Ramp Design
11.4 Quantity of Basic Lanes and Equalization of Lane Quantity
11.5 Bifurcation and Converging of Mainline and Diverging and Converging among Ramps
11.6 Grade Crossing in Traffic Interchange
11.7 Separate Grade Separation
12 Intersections between Highways and Railways/country roads/pipelines
12.1 General Provisions
12.2 Highway and Railway Interchange
12.3 Highway and Railroad Grade Crossing
12.4 Highway and Country Road Intersection
12.5 Highway and Pipeline Intersection
Wording Explanations
