6533b82ffe1ef96bd1295b70
RESEARCH PRODUCT
Estimating the safety performance function for urban unsignalized four-legged one-way intersections in Palermo, Italy
Roberta MarinoSergio MarinoAnna GranaTullio GiuffrèOrazio Giuffrèsubject
overdispersionCrashSample (statistics)safety performance functionsSafety performance functions urban intersection overdispersion correlationTransport engineeringurban intersectionGeometric designGeographyOverdispersionlcsh:TA1-2040correlationSettore ICAR/04 - Strade Ferrovie Ed AeroportiPerformance functionlcsh:Engineering (General). Civil engineering (General)Generalized estimating equationCivil and Structural Engineeringdescription
Abstract Starting from consideration that urban intersections are sites with promise for safety and operational improvements, the paper describes the steps taken to develop a crash predictive model for estimating the safety performance of urban unsignalized intersections located in Palermo, Italy. The focus is on unsignalized four-legged one-way intersections widespread in Italian downtowns. The sample considered in the study consist of 92 intersections in Palermo, Italy. For the study were collected crashes occurred in the sites during the years 2006-2012, geometric design and functional characteristics and traffic flow. Results showed that data were overdispersed and NB1 distributed. In order to account for the correlation within responses Generalized Estimating Equations (GEE) were used under different working correlation matrices.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-03-01 |