Transportation projects have both direct and indirect effects on the environments in which they are located. Research carried out under NCHRP 25-10, "Estimating the Indirect Effects of Proposed Transportation Projects," identified various types of indirect effects and produced a framework with supporting analytical methods for transportation agencies to estimate the indirect effects of proposed transportation projects in preparing environmental impact statements and related studies. This research was published as NCHRP Report 403: Guidance for Estimating the Indirect Effects of Proposed Transportation Projects (Guidance).

Transportation agencies continued to remain keenly interested in the issue of how to appropriately approach indirect effects estimation. Additional resources were necessary to prepare auxiliary materials to train practitioners in the use of the Guidance in a form that will facilitate its use.

The objectives of the continuation were: (1) to update and refine the Guidance to reflect developments on the issue since publication of the Contractor's Final Report and to provide new or improved items for a practitioner's toolbox; (2) to conduct historical case study analyses to provide an improved retrospective of indirect effects for application in estimation approaches; and (3) to develop training materials for practitioners in use of the Guidance.

The final report has been published as NCHRP Report 466. In addition to the Desk Reference, training materials that support it are available in the form of a slideshow as NCHRP Web Document 43. Part 2 of the web document contains supporting materials for the slide show.

To download the Powerpoint presentation (the downloaded version will allow you to see the instructor notes),
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