In order to evaluate safety, indicators like number of crash and possible costs related to it are considered, while those indicators are not controller and have no effects on safety and in some cases this information are not accessible for understudied area. Therefore, other safety indicators are required for safety control and supervisory that are called “surrogate indicators”. Speed, wearing seat belt, safety hat, unauthorized speed, using mobile phone during riding and headway violation are among these indicators. Theme of current paper is identifying effective factors on surrogate indicators in urban roads of Isfahan province. Information of vehicle speed and violating road authorized speed in 10 urban roads axis of Isfahan province relative to four effective main factors on these indicators include human, road, vehicle and environmental factors of axis are gathered. Through initial analysis of Excel output, Pearson correlation analysis method using Statistics software and regression tree and Keywords: surrogate, safety, correlation analysis, regression tree, classification, indicator
