Traffic impact studies (TISs) are used by transportation agencies to forecast system effects from proposed development projects and to predict the useful life of a transportation project against an expected land use scenario. The Oregon Department of Transportation (ODOT) project Best Practices for Traffic Impact Studies was completed because there is a perception that TISs are not as accurate as they could be, there is variability in assumptions and inputs to predict traffic impacts, impacts may not be accurately projected in TISs, and the best decisions for the transportation system may not be made. The research model consisted of three steps: (a) analysis of case studies for actual developments to compare forecasted traffic conditions to actual postdevelopment traffic conditions, (b) a literature search of the state of the practice by other jurisdictions, and (c) refinement assessment for topics of interest. Case study TISs were selected to compare forecasted traffic conditions to postdevelopment traffic conditions by analyzing key variables used in traffic analyses. Results of these comparisons were mixed. On the basis of the case study results and additional research, a set of best practices was identified for key technical topics to be considered in the scoping and preparation of TISs. The best practices supplement ODOT's development review guidelines but are equally applicable to other transportation agencies and local jurisdictions.


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    Title :

    Development of Best Practices for Traffic Impact Studies


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2008-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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