Abstract
Most carbon emissions come from cities, including mainly human activities in the fields of the urban economy, urban construction, and urban transportation. In terms of urban transportation, a truck produces far more carbon emissions than does a car. From the perspective of reducing the freight amount of urban road transport, underground logistics systems are a feasible solution in the future. Currently, metro-based freight is easier to implement, and the redundant transport capacity of the urban metro during off-peak hours can be put to good use. In addition, the pressure of the ground freight can be alleviated. Against the background of the coordinated operation mode of metro-based freight and ground freight, this study aims to measure the contribution of metro-based freight to reducing urban transportation carbon emissions by using the optimization method of metro passenger–freight coordinated transportation and traffic flow theory. Taking the Beijing Metro Batong Line as an example, the results of experiments show that the coordinated operation mode can significantly reduce urban transportation exhaust emissions.
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