The goals of this project were to first review the state-of-art with regard to identifying highway sections where
median barriers would be most effective in preventing median-crossing crashes (MCC), and if necessary, develop
remedies for any identified deficiencies. A statistical technique was developed for estimating the frequency and
rate of MCCs on each of a set of highway sections, which required the analyst to review only a subset of hard-copy
accident reports. This technique was applied to Minnesota’s freeways and rural expressways, and highway sections
were ranked with respect to estimated frequency of MCCs. A first version of a simulation model was developed for
comparing the cost-effectiveness of barrier projects on different highway sections. The model uses Monte Carlo
simulation to estimate the probability that an encroaching vehicle crosses a median with a specific cross-section,
and collides with another vehicle traveling in the opposite direction. The model is implemented as a pair of linked
Excel spreadsheets, with a companion macro written in Visual Basic for Applications.
Davis, Gary A..
Cross Median Crashes: Identification and Countermeasures.
Minnesota Department of Transportation.
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