The objective of the current study was to evaluate traffic and geometric features and their influences on the safety performance of roundabouts by developing suitable crash modification factors (CMFs). The cross-sectional method can be applied as an alternative method to estimate the CMFs when before-and-after studies are impractical to apply. e. g. https://www.roneverhart.com/RME-Fireface-UFX-III-Audio-Interface-p32300/