CurvePortal for Automated Identification and Extraction of Horizontal Curve Information

Twenty-seven percent of fatal crashes occur at horizontal curves, although they account for less than 10 percent of public roadway miles. Knowing where horizontal curves are located and their geometric characteristics are key to successfully addressing curve safety issues. Curve information is also essential for accurate placement of warning signs as safety treatment, especially where a curve has a history of crashes. To help states identify curve information, a tool called CurveFinder automatically identifies horizontal curves and extracts their geometric characteristics solely from GIS roadway maps. This report explores the ability of CurveFinder to extract curve-related elements; improve tool accuracy for low-quality GIS data sources; and develop an online portal called CurvePortal where agencies can upload their GIS roadway maps for obtaining horizontal curve location and geometric information.