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For calculating the lost capacity of the degraded road network and finding what kind of state of equilibrium traffic flow reaches on the degraded road network,it was revealed that road network was degraded by two kinds of cause;one came from outsides of traffic flow,such as bicycle flow,pedestrian flow and weather,and the other was induced by increasing traffic flow amount through links in traffic network.After discriminating effect of travel time and variance of travel time on traveller route choice,travel time risk criterion of a variable path was introduced which included both travel time and variance of travel time.Based on the new criterion,an equilibrium traffic flow analysis model in the degraded road network was established,which had property of existence and uniqueness.The analysis model can analyze what kind of equilibrium traffic flow will reach on the degraded road network.An example was given to show traveller trade off between path travel time and demand of travel reliability while they confront alternative routes,and results of equilibrium traffic flow on different cases of weight parameter were also displayed.
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