Traffic Safety Analysis of Design Elements on Four-Lane Highways

Traffic safety of highway horizontal design elements including highway width, radius, and the length of curves were analyzed on both concrete and asphalt pavement types. The measures of effectiveness (MOE) adopted in this study was accident rate. Limited accident analysis models developed recently were compared to select the optimal accident model and the optimal model developed in this study showed relatively high explanation of sum of squares by and 0.87, on concrete pavement and asphalt pavement, respectively. Also the statistical significance of the optimal model was reviewed and showed the randomness. The study result would be a good design consideration in high-way design process.