This paper studies the transportation demands of different stakeholders, namely
                    urban residents, entrepreneurs and tourists. It also studies the construction of
                    network model optimization functions and corresponding indicators, and analyzes
                    what kind of impact the bridge collapse will have on different stakeholders.
                    Urban residents attach great importance to convenience in their daily lives.
                    They usually like to travel by walking or cycling. They also prefer to use
                    public transportation facilities. Entrepreneurs mainly rely on the efficiency of
                    goods transportation to develop their businesses. They pay more attention to the
                    accessibility of commercial and industrial areas. Tourists, on the other hand,
                    prefer convenient connections between tourist attractions and hotels, as this
                    makes their visits more convenient. After the bridge collapsed, the traffic
                    pressure shifted to other main roads, such as I-95 and I-895. This led to longer
                    commuting times and a significant increase in transportation costs, exerting
                    varying degrees of impact on the travel demands of residents, entrepreneurs and
                    tourists.
Based on the analysis of the network model, this study gives targeted
                    optimization suggestions. For urban residents, it is necessary to build
                    pedestrian lanes and bicycle lanes and improve the existing travel network. In
                    this way, the accessible travel range of urban residents can be expanded. This
                    article also suggests improving the connection of public transportation to make
                    residents’ travel more convenient. For entrepreneurs, it is necessary to
                    optimize the layout of main and secondary roads, so that the pressure of goods
                    transportation can be relieved. For tourists, it is necessary to enhance the
                    transportation facilities near tourist areas to improve their travel experience.
                    These optimization measures aim to increase the resilience, efficiency and
                    fairness of the transportation system, providing more convenient and sustainable
                    transportation services for residents, enterprises and tourists.