Research carried out under NCHRP Project 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 has been published as NCHRP Report 403: Guidance for Estimating the Indirect Effects of Proposed Transportation Projects (hereafter referred to as the Guidance). Transportation agencies continue to remain keenly interested in the issue of how to appropriately approach indirect effects estimation. Auxiliary materials to train practitioners in the use of the Guidance need to be available in formats that will facilitate http://gulliver.trb.org/publications/nchrp/nchrp_rpt_466.pdfits 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 for Project 25-10 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 Louis Berger Group, Inc., of East Orange, New Jersey provided the research team for this project and prepared the desk reference and slides. These products reflect information obtained from a broad range of sources, including a survey of more than This report may be accessed by Internet users at 350 federal and state transportation and environmental agencies, academic institutions, and other organizations having interest and expertise in transportation project planning and development. From this data collection, the authors have provided a thorough synthesis of agency regulation, case law, published literature, environmental impact statement content, and practitioner experience and perspective leading to a typology of “indirect effects.” These products also include a framework for identifying and analyzing indirect effects of proposed transportation projects in order to provide planners and practitioners the ability to integrate indirect effects assessment into ongoing evaluation processes. Finally, the authors have identified appropriate tools and techniques for discerning which of the indirect effects of a proposed transportation project warrant detailed analysis and for carrying out those analyses, as well as a course curriculum for teaching effective methods of applying these techniques. The slides are published in PDF format as NCHRP Web Document 43. Web documents are available at: www4.trb.org/trb/crp.nsf. (A)
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