This file contains a description of steps needed to replicate the results published in this study: 1) Download data 2) Import data into ArcGIS (roads, crashes, training set) 3) Launch ROCA and import training set 4) Apply ROCA software to roads. 5) ROCA results (a new file containing individual geometry segments) import into the GIS and compare with the traffic crashes 5) Join crash and curve data in order to compute CMF (e.g. in R software)