United States Department of Transportation
i
Incorporating Weather Impacts in Traffic Estimation and Prediction Systems [Summary]
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2010-02-01
[PDF-187.69 KB]
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Abstract:About 25 percent of all highway crashes and 18 percent of all fatalities are weather related. In addition to a tremendous impact on safety, adverse weather reduces service capacity, diminishes travel reliability, and impacts both the supply and demand sides of transportation. Effective traffic management requires an understanding of adverse weather which can be addressed by incorporating weather into transportation operations. Prior to the RWMP project, existing TrEPS prototypes had only been calibrated and tested under “normal” weather conditions. No provision had been made to explicitly capture the behavioral phenomena that determine traffic patterns during adverse weather, predict how traffic might be impacted by such weather, and determine the effect of various advisory and regulatory interventions. Even though there was a need for online estimation and prediction for unanticipated weather events, the current tools did not have the ability to represent traffic behavior under such conditions, or the possible interventions that would mitigate the impact.
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