Security Technology Research On Restricted Exit Of Interchange For Expressway

Road conditions and traffic conditions of restricted exit of interchange for expressway are complex and proned to accidents. Identification on the restricted conditions and export systematic study of safety and security measures can effectively reduce the number of traffic accidents restricted exit region, to improve the level of expressway capacity to provide technical support and service.By analyzing the characteristics of restricted exit of interchange for expressway. The paper proposed interchange definition of restricted exit and type, the paper divided the restricted exit of expressway into the main line restricted exit and spacing restricted exit. By using vehicles theory and application of the principle of ergonomics, the paper analyzes the identification horizon of different design speed of restricted exit, it comes to identify horizon of the interchange area on the main line of plane convex circular curve radius and the radius of vertical curve. By studying on the light adaptation distance, recognition distance to the exit, traffic signs recognition and operation distance, the minimum spacing demand between tunnel and exit of interchange, It is put forward the spacing required values between exit of interchange and tunnel. By analyzing the characteristics of traffic for main line restricted interchange exit and spacing restricted exit. It proposed traffic flow exporting technology of main line restricted exit and spacing restricted exit. For the forms and severity of accidents of interchange restricted exit, the paper presented including triangular end fender, calming devices and safety facilities setting technical requirements.The paper took restricted exit of tunnel and interchange for expressway as example and analyzed Spacing demanding of exit for the tunnel and interchange. By applying technology and exporting traffic safety end theory, the paper provided engineering measures, traffic engineering and management measures. The application results showed that the effect is good.