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Starting from consideration that urban intersections are sites with promise for safety and operational\udimprovements, the paper describes the steps taken to develop a crash predictive model for\udestimating the safety performance of urban unsignalized intersections located in Palermo, Italy.\udThe focus is on unsignalized four-legged one-way intersections widespread in Italian downtowns.\udThe sample considered in the study consist of 92 intersections in Palermo, Italy. For the study were\udcollected crashes occurred in the sites during the years 2006-2012, geometric design and functional\udcharacteristics and traffi c fl ow. Results showed that data were overdispersed and NB1 distributed.\udIn order to account for the correlation within responses Generalized Estimating Equations (GEE)\udwere used under different working correlation matrice

Estimating the Safety Performance Function for Urban Unsignalized Four-Legged One-Way Intersections in Palermo, Italy