高速公路网规划的几个关键问题

Several key questions of freeway network planning

提出高速公路网规划的布局、总量、规模和序列四大关键问题。规划正是通过布局反映社会经济发展对交通的需求及其合理配置 ,给出了确定合理布局的目标函数 ;总量是确定合理规模的基础 ,构造了通道总流量预测的“弹性模型”;规模指网络能提供的总能力 ,合理规模是供需均衡的高效配置 ,建立起“投资—回报—服务水平”平衡方程 ;序列是网络滚动实施的优先时序 ,是高速公路网充分发挥效益和可持续发展的保证。

This paper puts forward the four key questions which are layout,gross,scale and sequence of the freeway network planning.The planning reflects the social economic development to the requirements of the traffic and the rational configuration through the layout.The objective function to determine rational layout is given here.The gross is the base of determining rational scale.It constructs the elastic model to predict the channel flow.The scale indicates the whole capacities that the network can provide and the rational scale is the high effective configuration of the equilibrium of provision and requirements.It constructs the equilibrium equation of “investment repayment serving”.The sequence is the priority of the network scroll implement.It is also the guarantee of the maximal benefit and sustained development of the freeway network.