Designing And Safety Evaluation Of The Freeway Interchange Exit Ramp

As the Freeway traffic accident-prone point, the exit ramp traffic safety situation is increasingly serious. Foreign statistics show that nearly 30% of Freeway traffic accidents happen on the ramp, in which the accident occurred on the exit ramp is about 2 times the import ramp. Therefore, how to accurately diagnose the exit ramp traffic safety issues and put forward corresponding improvement measures, improve the exit ramp and the whole highway traffic safety has become a hot spot in the field of road works.This paper adopts the research method that theoretical analysis combined with case studies and qualitative analysis with quantitative analysis, summing up the influencing factors of the exit ramp safety as road factors, transport factors, traffic environment three categories based on the discussion and analysis about Freeway Interchange exit ramp safety features;then use analytic hierarchy process to compare the importance of the security impact factors and establish the safety Evaluation Model of freeway Interchange exit ramp; simulate and verify the design parameters for important factors; Finally according to the research conclusion to modify instance ramp.Thesis research found that the Freeway Interchange exit ramp traffic safety is obviously affected by the length of the deceleration lane and ramp curve radius, the corresponding design value in the current highway route design specifications (2006), tends to smaller, and can be appropriately improved in the actual design. Verify rationality and feasibility of the thesis conclusions by a freeway Interchange instance transformation.