Study On Layout Of Freeway Based On Urbanization

In the early of reform and opening up,the main contradiction in the transportation industry is rapid economic development and backward infrastructure construction,that is why most of the planners in the freeway layout planning is often guided by traffic volume and focus on network coverage and accessibility leading to ignore freeway layout planning and urban coordinated development.But with the rapid development of the national economy and the rapid growth of transport,China's urbanization process gradually accelerated,and the freeway near the city is gradually annexed by city,this kind of freeway not only can not satisfy people's daily travel needs but also impeded the interaction between the different regions,wherefore this kind of freeway need to be reform.However there are many difficult problems during the process of freeway alteration.Thence,freeway planning and urban layout planning need to be considered.This paper analyzes the shortcomings of the traditional freeway network layout method,and proposed a idea of combining urban development and freeway development trend into freeway layout planning.The factors evaluation system of urban construction land suitability is established by analyzing the main influencing factors of urban expansion and its influencing mechanism,combining Geographic data getting from RS and GIS?Analytic Hierarchy Process and Gray Forecasting Model to establish urban expansion model based on GIS and circle theory.This method forecasted the future development of the city through the GIS platform and the basic principle of this model;proposing new freeway layout strategy according to the forecast range of the city developing;we can divide new freeway into three categories:urban freeway(expressway)? freeway ? suburban freeway,and making freeway layout strategy according to each new freeway development trend.The city expansion forecasting model this paper constructed have good coincidence with city regional development trend and the freeway layout through the example analysis.The relationship between freeway and city is increasingly close,it is necessary to overall planning and reasonable arrange during making making new freeway layout plan.Therefore,the content of this paper improves the freeway layout and construction system,and can guide new freeway scientific and rational layout and construction,reducing difficulties from transformation of freeway due to its function change.This paper studies can be used as a useful reference for making freeway layout plan in the future.