Transportation Economic Development Impact System

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Developer(s) Economic Development Research Group
Operating system Web-based, independent of user operating system
Type Economic evaluation
Website TREDIS Website

Transportation Economic Development Impact System(TREDIS) is a web-based analysis system that is used in planning major transportation investments in the US and Canada. The role of economic impact analysis and TREDIS in the transportation planning process is explained in guidebooks of the US Department of Transportation and American Association of State Highway and Transportation Officials.[1][2][3][4]

TREDIS has been most commonly used for assessing the expected economic impacts of statewide highway programs[5], regional multi-modal plans[6] and public transport investment[7]. Its history and theoretical foundation is explained in peer reviewed journal articles[8][9].

How It Works

TREDIS has a series of modules that calculate different forms of impacts and benefits. One module is an accounting framework that calculates user benefits, including impacts on cargo transportation and commuting cost, based on transportation forecasting results. A second module calculates wider economic development benefits, including impacts on business productivity, economic development and multiplier effects from input-output analysis. It applies an economic model to estimate impacts on jobs, income, gross regional product and business output, by sector of the economy. A third module applies cost-benefit analysis from alternative perspectives.


  1. [1]A Guide to State DOT Consideration of Economic Development Potential in Planning, ICF Consulting for the AASHTO Standing Committee on Planning, NCHRP 8-36-60, March 2007
  2. [2]Best Practices in Using Programmatic Strategies in Statewide Transportation Plans, Wilbur Smith Associates for AASHTO, NCHRP Project 8-36-67, 2007
  3. [3]Return on Investment on Freight Rail Capacity Improvement, Cambridge Systematics for AASHTO, NCHRP Project 8-36-43, 2005
  4. [4] Guide to Quantifying the Economic Impacts of Freight Projects, US Department of Transportation, 2006
  5. [5]The Cost of Highway Limitations and Traffic Delay to Oregon's Economy, Oregon Business Council, 2007
  6. [6]The Cost of Congestion to the Economy of the Portland Region, Portland Metro, 2005
  7. [7]Time is Money: The Economic Benefits of Transit Investment, Chicago Metropolis 2020, 2008
  8. [8]Weisbrod, G. "Models to predict the economic development impact of transportation projects," Annals of Regional Science, Volume 42, Number 3 / September 2008
  9. [9]Alstadt, B. “A Generalized Approach for Assessing the Direct User Impacts of Transportation Projects,” Transportation Research Board, Annual Conference Proceedings, January 2008

See also

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