Highlights Accident modification functions for horizontal curve radius in ten countries are reviewed. A formal synthesis of the functions for eight countries is developed. Accident rate in horizontal curves increases monotonically and at an accelerating rate as curve radius is reduced. The sharpest curves appear to have different levels of risk in different countries.
Abstract Studies of the relationship between characteristics of horizontal curves and accident rate have been reported in several countries. The characteristic most often studied is the radius of a horizontal curve. Functions describing the relationship between the radius of horizontal curves and accident rate have been developed in Australia, Canada, Denmark, Germany, Great Britain, New Zealand, Norway, Portugal, Sweden, and the United States. Other characteristics of horizontal curves that have been studied include deflection angle, curve length, the presence of transition curves, super-elevation in curves and distance to adjacent curves. This paper assesses the international transferability of mathematical functions (accident modification functions) that have been developed to relate the radius of horizontal curves to their accident rate. The main research problem is whether these functions are similar, which enhances international transferability, or dissimilar, which reduces international transferability. Accident modification functions for horizontal curve radius developed in the countries listed above are synthesised. The sensitivity of the functions to other characteristics of curves than radius is examined. Accident modification functions developed in different countries have important similarities. The functions diverge with respect to accident rate in the sharpest curves.
International transferability of accident modification functions for horizontal curves
Accident Analysis and Prevention ; 59 ; 487-496
2013-07-10
10 pages
Article (Journal)
Electronic Resource
English
International transferability of accident modification functions for horizontal curves
Online Contents | 2013
|Developing Accident Modification Functions
Transportation Research Record | 2009
|Temporal transferability and updating of zonal level accident prediction models
Online Contents | 2006
|Calibration and Transferability of Accident Prediction Models for Urban Intersections
Online Contents | 2002
|Calibration and Transferability of Accident Prediction Models for Urban Intersections
Transportation Research Record | 2002
|