- hint sfv85 calculation and safety analysis system
hintcad road safety analysis system
brief introduction the actual operating speed of vehicle is one of the main basis criteria of hintcad safety analysis system of highway alignment design. the system can effectively check and analyze the collocation between the design speed and the main design parameters of horizontal, profile and cross section of the route as well as related elements such as sight distance, super elevation and so on, to obtain a continuous, consistent and balanced design. 1. concept and characteristics of the operating speed means the speed at which 85% of drivers drive lower than on the specific road section under clean, damp conditions, referred to as the v85. the operating speed synthetically considers the following factors: overall consideration of driver behavior, psychological and visual demand, vehicle performance and characteristics, alignment geometric design factors.
