Study On Safety Facilities In The Long Slope Alignment Of Freeway

Based on the domestic and foreign investigated status, the thesis analyze the security and administration measure of the long and steep downhill roads of freeway, point out the reasons and mechanism why the accident happens, find out the existing problem of safety facility in the long and steep downhill roads of expressway. Coalescent with the characteristics of road, driver, vehicle, accident, etc. study detailedly on the establishment principle, watch model, indicating types and the position of traffic sign system; the establishment principle, setting types and position of traffic marking system; the selection approach of types and problems that should notice setting up of guardrail facility, etc. and set up the safety facility in the long and steep downhill roads of expressway systematically.Then research the truck escape ramps of project measure in the long and steep downhill roads especially. Combine establishment principle and consideration of the truck escape ramps, compare the setting methods , introduce the theory of graphical methods detailedly. And then analyze the brake principle , composite structure , parameter calculation and recommended the range of the parameter. Carry on research the affiliated facility of truck escape ramps , import a kind of new dissipate energy facility—Passive Protection System.The paper establish the traffic safety facilities evaluation quota system of the Long and steep downhill freeway ,and analyze to the evaluating indicator ,its standard of criterion and the pretreatment approaching , confirm the evaluation method of the system on the basis of considering various appraisal method synthetically, that is the method of fuzzy comprehensive appraisal based on AHP.