JTG D20-2017: Design Specification for Highway Alignment

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Scope

1.0.1 In order to guide highway design, reasonably determine highway's
functions, technical classes, construction scale, main technical indicators, this
specification is hereby formulated.
1.0.2 This specification is applicable to the design of newly constructed,
reconstructed, expanded highways.
1.0.3 For the highway design, it shall determine the highway function, through
comprehensive analysis, based on regional characteristics, traffic
characteristics, highway network structure. It shall be based on the highway
functions, combining the traffic capacity and terrain conditions, etc., to select
technical grades and main technical indicators.
1.0.4 All classes of highways shall be subject to overall design. The overall
design shall run through all stages of the highway construction project, from the
feasibility study to the construction drawing design; cover all relevant disciplines
of the highway construction project.
1.0.5 For the highway design, it shall be based on highway functions, use tasks,
roles in the highway network, comprehensively consider multiple transportation
modes, such as railways, waterways, aviation, pipelines, etc., as well as the
relationship between highways and cities and towns, farmland planning, to
implement the comprehensive transport development requirements, AND
reasonably demonstrate and determine the route direction and corridor belt.
1.0.6 For the alignment plan, it shall, based on the selected corridor belt AND
the main control points, carry out the layout and overall design, to rationally use
the technical indicators. The feasible alignment plan shall be compared and
selected, to determine the design plan. When different design speeds, technical
indicators or design plans have obvious impacts on operational safety,
engineering cost, natural environment, social and economic benefits, etc.,
THEN, it shall carry out the technical and economic demonstrations, of the
same depth.
1.0.7 For the line position of the alignment, it shall make full investigation on the
engineering geology, hydrogeology, meteorological conditions, natural
disasters, highway construction materials, ecological environment, natural
landscapes, etc., according to the topography and ground conditions. It shall
be selected based on the study of regional climate characteristics, along the
route. Meanwhile, it shall choose the main horizontal and vertical technical
indicators.
1.0.8 For the alignment design, it must implement the basic national policy of
strengthening environmental protection and rational use of land resources. In
the process of determining the design of the structure form and layout of the
artificial structures, such as roadbeds, pavements, bridges, tunnels, crossings,
traffic engineering, facilities along the line, as well as the soil borrowing and
disposal yard and land acquisition, it shall reduce the impact of highway
construction, on the ecological environment along the route. Meanwhile, it shall
combine the greening OR take corresponding engineering measures, to
coordinate and improve the coordination, BETWEEN the artificial structures
AND natural landscapes along the route, thereby improving the environmental
quality of the highway.
1.0.9 The alignment of highway shall be designed, according to the design
speed. It shall use the running speed for inspection; maintain linear continuity.
It shall comprehensively coordinate the relationship between the highway plane,
longitudinal section, lateral section, so that the plane is smooth and suitable,
the longitudinal section is balanced, the lateral section is reasonable.
1.0.10 For the expressways, primary highways, secondary arterial highways,
they shall be evaluated for traffic safety during design. For other highways, it
may also carry out evaluation of traffic safety, when conditions permit.
1.0.11 When the highway adopts the phased construction plan, the overall
design must follow the principles of overall planning and phased
implementation, so that the early-phase projects can still be fully utilized in the
later phase; meanwhile, there is room for the construction of later projects AND
to create favorable conditions.
1.0.12 When the highway is reconstructed and expanded, it shall carry out
demonstration and comparison-selection, for the reconstruction and expansion
plan AND the partial new construction plan. When adopting the reconstruction
and expansion plan, it shall follow the principle of combining utilization and
reconstruction, to utilize the original project reasonably and fully.
1.0.13 In addition to complying with the provisions of this specification, the
highway design shall also comply with the current relevant national and industry
standards.

Basic Data

Standard ID	JTG D20-2017 (JTGD20-2017)
Description (Translated English)	Design Specification for Highway Alignment
Sector / Industry	Highway and Transportation Industry Standard
Classification of Chinese Standard	P66
Classification of International Standard	93.080
Word Count Estimation	103,141
Date of Issue	2017-09-28
Date of Implementation	2018-01-01
Older Standard (superseded by this standard)	JTG D20-2006
Regulation (derived from)	Ministry of Transport Announcement 2017 No. 38
Issuing agency(ies)	Ministry of Transport
Summary	This standard is applicable to new and modified highway design.