HighlightsFew studies have evaluated the road safety effects of motorways.An Empirical Bayes before-after was made of a new motorway in Norway.The number of killed or seriously injured was reduced by about 75%.There were small changes in the number of injury accidents.
AbstractThis paper presents an Empirical Bayes before-after evaluation of the road safety effects of a new motorway (freeway) in Østfold county, Norway. The before-period was 1996–2002. The after-period was 2009–2015. The road was rebuilt from an undivided two-lane road into a divided four-lane road. The number of killed or seriously injured road users was reduced by 75 percent, controlling for (downward) long-term trends and regression-to-the-mean (statistically significant at the 5 percent level; recorded numbers 71 before, 11 after). There were small changes in the number of injury accidents (185 before, 123 after; net effect −3%) and the number of slightly injured road users (403 before 279 after; net effect +5%). Motorways appear to mainly reduce injury severity, not the number of accidents. The paper discusses challenges in implementing the Empirical Bayes design when less than ideal data are available.
An Empirical Bayes before-after evaluation of road safety effects of a new motorway in Norway
Accident Analysis and Prevention ; 108 ; 285-296
2017-09-12
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Comparison of empirical Bayes and full Bayes approaches for before–after road safety evaluations
Online Contents | 2010
|Comparison of empirical Bayes and full Bayes approaches for before–after road safety evaluations
Online Contents | 2010
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