通过对国内改扩建公路、护栏提级改造工程、事故段护栏加强改造工程以及新旧公路交通安全设施规范进行研究,提出护栏改造设计原则。分别提出路侧波形梁护栏和中分带护栏的护栏改造方案,并对其经济效益分析的费用组成进行一定研究。 Through the research on the rebuilding and expansion of domestic roads, the upgrading of guardrails, the improvement of the guardrail of the accident section and the regulation of the traffic safety facilities of old and new roads, the design principles of the guardrail renovation are put forward. Proposed the road side wave beam guardrail and fencing fence in the program of rebuilding, and its economic analysis of the cost of a certain composition.