Safety on highways is one of the most important subjects in Transportation Engineering. The increasing rate of vehicles and the needs to design or geometrically modify the highways has been emphasized in the safe-design of roadways more than before. Between the constructive components of the highway, due to the increasing occurrences of accidents the horizontal curves are of great importance. T...

Accident prediction models, also known as safety performance functions, have several important uses in modern day safety analysis. Unfortunately, calibration of these models is not straightforward. This paper documents a research effort that demonstrates the complexity of calibrating these models for urban intersections. These complexities relate to the specification of the functional form, the...