在研究国内外道路交通安全评价方法的基础上，根据我国道路交通安全现状及道路交通安全监督管理的要求，将灰色系统理论应用于道路交通安全评价，建立了一套基于TWW函数的道路交通安全灰色评价指标体系，并对6省市的交通安全水平进行了比较研究。

Based on the researches of evaluation methods about road traffic safety in China and abroad, the gray system theory is used for the first time in road traffic safety to set up a trigonometry whitening weight (TWW) function evaluation model in accordance with the request of China's present road traffic safety. And the evaluations of road traffic safety in 2003 in Shandong, Shanghai, Henan, Zhejiang，Guangdong and Jiangsu are studied and compared one another.