## 3 The Main Content and Key Technologies of SC Supported by DTs
### Advantages and Specific Applications of Smart DC
\begin{table}
\begin{tabular}{c c} \hline \hline
**Traffic Data Fusion Model** & **This Model Integrates the Data Perceived by Different Traffic Sensors to Form a Unified Traffic Data Flow, including Traffic Flow and Speed** \\ \hline Traffic situation analysis & Based on historical data and real-time traffic perception data, this model analyzes and predicts traffic and evaluates traffic, including traffic flow and speed. \\ \hline Signal control model & According to real-time traffic flow data and prediction of traffic flow, this model optimizes intersection signal timing including single point and route and regional optimal time scheme. \\ \hline Traffic planning model & This model is based on the four-stage method of traffic planning and combines the big data of traffic travel and mobile Internet to predict network traffic volume, including traffic volume and service level. \\ \hline Bus optimization model & Based on the bus network, the model predicts bus travel, evaluates the service level of the bus system, and optimizes the bus network, including the evaluation of the service level of the route optimization. \\ \hline Stop-induced model & Based on the prediction of regional parking space occupancy status and parking demand, the model provides regional parking optimization guidance information, including parking guidance information. \\ \hline Intelligent road model & This model forms a road high-resolution dynamic map according to the real-time perception data of intelligent road and assists connected vehicles to drive safely, including road high-resolution dynamic maps and connected safety tips. \\ \hline Micro simulation model of traffic flow & This model combines vehicle dynamics characteristics and driving and the following model to simulate real-time traffic flow, to compare the advantages and disadvantages of different schemes, including scheme comparison and evaluation. \\ \hline Accident analysis model & This model combines the main factors of accidents to analyze traffic accidents and evaluate road safety, including road safety evaluation and analysis of the main causes of accidents. \\ \hline Auxiliary decision model & This model carries out technical and economic analysis and evaluation of transportation improvement projects and recommends projects with excellent cost performance, including technical and economic analysis and evaluation of projects. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Possible traffic model of DTs traffic. the processing mode of the event can be adjusted, and the response and processing process of the event can be optimized [92]. It can also arrange to rehearse emergency evacuation routes to make the best decisions in a low-cost environment. DTs visual cities are typically characterized by a global vision, accurate maps, simulations, virtual reality interactions, and intelligent interventions, accelerating the progression of urban governance and application capabilities across sectors [93; 94; 95]. Especially in the field of SC governance, it has formed a number of super applications from a global perspective, such as spatial analysis and impact simulation of urban planning, interactive planning and simulation of urban development projects, and urban scenario description, which are used to monitor the normal operation of cities. According to the time and regional development of the urban region, the future development trend is obtained, the law of urban development is understood, and the government is supported to strictly implement it. The urban traffic flow and signal simulation maximize the road capacity. In public services, dual digital analog and three-dimensional interactive experiences will redefine the importance and means of education, health care, and other services [96; 97]. Despite some differences, DTs can play an important role in the metaverse. Hypothetically, the hypothetical scenario can be successfully run by providing real data to the components in the meta-universe.