In order to improve the traffic safety and driving efficiency of urban underground roads,the influencing factors of urban un-derground road traffic safety were analyzed,and the technical points for the design of traffic signs,traffic markings,protective facilities,and intelligent transportation facilities on urban underground roads were summarized.The longitudinal distance between unobstructed traffic signs and other facilities was studied,and the traffic parameter design method for key nodes of urban underground roads such as cross-sections,underground interchange points,and entrances was proposed.A model for the distance between the setting points of di-version point warning signs and diversion points was established,and a minimum distance recommendation value was given.Finally,taking Huayuan Avenue as an example,the traffic design method for key nodes of urban underground roads was introduced.
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