本土化的城市虚拟交通系统与交通发展决策支持模式，在解决由快速城镇化引发且趋于严重的城市交通问题、克服现阶段智能交通系统存在的瓶颈方面具有重要意义。本研究依托大数据、互联网等信息技术，建立了由基础数据库、分析模型库、软件模块库、备选预案库组成的城市虚拟交通系统，涵盖其理论框架、系统功能、技术体系，据此提出覆盖城市土地开发、交通设施建设、交通运行管控、公共交通运营、交通政策制定等应用场景的交通发展决策支持模式。以重庆市为例，阐述了城市虚拟交通系统构建过程，完成重庆市新型冠状病毒肺炎疫情期间居民出行、车辆通行错峰方案的政府决策论证。结果表明，基于城市虚拟交通系统的交通发展决策支持模式在实际交通方案论证过程中具有及时性和有效性。研究建议，未来我国城市交通规划管理可注重城市虚拟交通系统的建设和运用，及时纳入新型信息技术成果以优化应用效果。

Developing a localized virtual urban transportation system (VUTS) and a decision support mode for transportation development is significant for solving the increasingly severe urban traffic problems caused by rapid urbanization and for overcoming the current bottlenecks that restrain the intelligent transportation system development. Based on the advanced information technologies such as big data and Internet technologies, this study establishes a VUTS that is composed of four parts: basic databases, analysis models, software platforms, and alternative plans; the theoretic framework, systematic functions, and technical system of the VUTS are analyzed. Furthermore, a decision support mode for transportation development is proposed; it covers the application scenarios including urban land development, traffic facilities construction, traffic operation control, public transport operation, and traffic policy making. Subsequently, we built the VUTS of Chongqing and provided plans for the municipal government regarding its decision on shifting peaks for residents and vehicles during the outbreak of the COVID-19 epidemic. The case results suggest that the decision support mode based on VUTS is effective in the demonstration of traffic plans. Therefore, we suggest that China attach importance to the VUIS and its application in urban traffic planning and management and incorporate new information technologies to optimize the application effects.