【正文】
plus in the areawhere the cost of public transport can be significantly reduced by decreasing congestionbecause of the long travel distances involved Particularly if a substantial portion ofusers are captive to public transport. The results of scenario 2 show that more highine travelers have to abandon the plan of migrating to suburb mainly owing to theserious congestion on the condition of free use. Another deeply influenced group ismedium ine travelers who shift from public transport modes to car driving. Bus fare reduction and bus lines increase make many medium ine residents shiftto bus transport meanwhile the car users shift to light rail particularly those who travelfor short distances. Furthermore the research finds that an integrated policy of improvedpublic transport service and some private car disincentives is beneficial to improvesystem efficiency and suburb munity attractiveness. The integration consists of light rail and bus fare reduction service qualityimprovement and highway toll imposition. It should be pointed out that light rail hasbeen designed to increase transit rider ship by making public transport more attractive tousers and thus to reduce road congestion. According to the simulation result the lightrail and bus fare reduction and capacity increase makes this mode more attractive tothose low and medium ine travelers who are captive to bus mode before. The finaloute is that more people can migrant to the suburb from low to high ine course the public transport service improvement requires government subsidizationwhich is a worldwide phenomenon. The economic travel distance of each mode is almostnot affected by different transport service policies. Bus is used more by short distancetraveler while the medium and long distance muters prefer to light rail. On thecontrary car users are not sensitive to the travel distance as shown in figure 34. Theresult indicates that those low ine citizens are restricted from migrating to economichouses in suburb towns on account of existing transport service policies includingrelatively high fare of public transport and highway limited light rail capacity and buslines. Of course all transport modes have been affected to some degree by the numbersof persons working at home. Urban transportation is a major realm of government po1icy throughout the transport policies also will affect the urban form deeply especially duringsuburbanization. In Beijing many economic apartments have been constructed in suburbfor those low ine citizens. There are two major problems before the policy from the past exper.