This project aims to conduct a comprehensive safety assessment for newly planned and designed streets and roads in Nanjing using a number of factors such as highway geometry, pavement skid resistance, traffic signs and marks, traffic flow, weather, lighting condition, transportation facilities (e.g., interchanges, on- and off-ramps, tunnels and bridges), etc. The assessment result is summarized through multiple single-factor indices well as an overall Safety Risk Index for every segment of a transportation network. Engineering countermeasure treatments are proposed to mitigate the safety risk.