Digital Twins for Traffic Systems:Concept,Levels of Technical Maturity,and Research Directions
The emerging concept and technology of digital twins provide a key theoretical framework and technical route for the establishment of a traffic system that integrates and interacts with physical and virtual spaces and has received widespread attention from academic,industrial,and government sectors at home and abroad.However,in the process of research and application,there are several pressing issues with the digital twins for traffic systems:① The concept needs to be clarified;② The twinning object needs to be defined;③ The maturity level of the twinning ability needs to be established;④ Research on new transportation technologies supporting digital twins needs to be strengthened.To this end,this paper systematically sorts out and defines the concept and object of digital twins for traffic systems and further proposes a four-level maturity model called VDMO("visible-diagnosable-manageable-optimizable")of the digital twins for traffic systems.Typical application scenarios are taken as the entry point.Then,the research progress,scientific problems,and key technologies corresponding to the four-level maturity model are analyzed.Finally,from the perspective of sustainable development and engineering practice application,the challenges and prospects of digital twins for traffic systems are summarized.This review offers valuable references for technological research,engineering practices,and the sustainable development of digital twins in traffic systems.
traffic engineeringroad traffic systemreviewdigital twinsmaturity modeltraffic simulationcontrol and optimization of traffic systems
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