Risk-Based Calibration of Road Sag Vertical Curve Design Guidelines on Undivided Highways

Safety in highway geometric design is one of the main goals to be achieved. However, deterministic criteria do not provide information concerning risk associated with outputs proposed. To yield consistent safety levels, sag vertical curve model on undivided highways was calibrated using a reliability-based framework, which allows incorporate uncertainty variables. The contemplates features vehicle front lighting systems compute headlight sight distance (HSD), must equal or greater than stopping (SSD). A dataset 34,238 case studies generated. Each study two values level, designated as probability noncompliance (Pnc), per driving direction. Monte Carlo simulation selected calculate Pnc. Through series interpolating surfaces cloud points, contour graphs and charts were depicted. paper provides new methodology verify, design, compare curves, evaluating level