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See Chinese contents: JTG D20-2017 JTG D20-2017: Design Specification for Highway Alignment
In order to guide highway design, reasonably determine highway functions, technical classes, construction scale, main technical indicators, this specification is hereby formulated. This specification is applicable to the design of newly constructed, reconstructed, expanded highways. 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.
