Pre-examine method of traffic congestion under urban land redevelopment

Based on systematic analysis method, the evaluation index system of traffic condition and congestion level was set up.Two indexes including road network traffic congestion ratio and road network traffic congestion contribution were used to evaluate the impact level of traffic congestion, the judgement standard of traffic reasonability was determined, the pre-examine method of traffic congestion under urban land redevelopment was established, and example verification was carried out by using three development schemes of partial regions in Maryland including no-redevelopment scheme, housing redevelopment scheme, housing and employment redevelopment scheme.Analysis result shows that in the first scheme, car sharing ratio, average trip distance, total running mileage, total running time, total vehicle delay, congestion lane mileage, vehicle delay index and congestion lane mileage ratio are 93.70%, 24.98 km, 225 817 698 km, 5 369 291 h, 2 038 880 h, 4 686 km, 0.380 and 0.180 respectively.In the second scheme, these indexes are 92.48%, 24.78 km, 219 992 101 km, 5 227 303 h, 1 831 190 h, 4 320 km, 0.350 and 0.166 respectively.In the third scheme, these indexes are 92.22%, 24.82 km, 219 023 166 km, 5 342 457 h, 2 062 041 h, 4 422 km, 0.386 and 0.169 respectively.The road network traffic congestion ratios of these three schemes are 0.280, 0.258, 0.278 respectively.In the third scheme, vehicle delay and vehicle delay index both rise.It is clear that the second scheme is slightly helpful to reduce traffic congestion and better than the first and third schemes.