Calculation Models of the Urban Traffic Environmental Carrying Capacity

With the urgent increasing of the demands of urban transportation, the environment problems are getting worse and the usage efficiency of traffic resources has been reduced. Based on the traditional urban transportation planning theory, the traffic environmental carrying capacity is adopted as the constrained condition to control and optimize the development scale and modes structure of urban transportation. After a thorough study and comparison of the main urban developmental modes, the paper points out that the ideal urban developmental mode is the eco-city. By using the traffic environmental carrying capacity as the constrained condition, the theoretical frame of the urban eco — transportation planning is formed. According to the related theories of the transportation engineering and the environment engineering, the different phases of the urban transportation planning are researched, the calculation contents and models are formed, and all the parameters in the models are defined. The model can be applied in the planning and management of transportation network, and feasibility research of highway project.