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1引言随着我国城镇化进程的不断加快和深入,城市规模的不断扩张,都市区化成为大城市发展的趋势,在区域内形成了具有较强社会经济联系的高度城市化地区。城市空间的不断扩展使城市外围的高速公路不断纳入城市道路范畴,城市外向交通服务功能逐步被内部交通服务所取代,道路功能和服务模式的变迁使得高速公路与城市快速路的界限逐渐模糊。高速公路原本服务过境交通和出入境交通的功能逐渐
1 Introduction With the accelerating and deepening of urbanization in our country and the continuous expansion of urban size, urbanization has become a trend of metropolitan development and has formed a highly urbanized area with strong socio-economic ties within the region. The continuous expansion of urban space brings the expressway outside the city into the category of urban roads. The function of urban outward transportation service is gradually replaced by the internal traffic service. The changes of the road functions and service modes make the boundaries between expressways and urban expressways gradually blurred. The original function of the expressway to serve cross-boundary traffic and exit-entry traffic is gradual