BilevelProgramm ingM odel for C ity Road Network Planning and ItsApplication

The objectives ofcity road network planning and shortcomings of the available programming modelswere analyzed. A bilevelprogrammingmodelwas proposed for city road network planning, and iteration optimization algorithm was used to solve themode.l As an example of application, themodel was applied in the road network planning ofLanzhou City. Current situations and the future demands on the traffic in the citywere elaberately taken into consideration. A scheme of road network planning forLanzhouwas presented, inwhich a reasonal pyramid distribution of the road typeswas formed.