Sources of error in road safety scheme evaluation: a method to deal with outdated accident prediction models.

摘要

This paper considers the errors that arise in using outdated accident prediction models in road safety scheme evaluation. Methodsudto correct for regression-to-mean (RTM) effects in scheme evaluation normally rely on the use of accident prediction models. However,udbecause accident risk tends to decline over time, such models tend to become outdated and the estimated treatment effect is then exaggerated.udA new correction procedure is described which can effectively eliminate such errors.ud