The INDOT Applicant’s Guide to Traffic Impact Analysis (TIA) is a product of SPR-3605 "Updated Methods for Traffic Impact Analysis". The purpose of this study was to review the Applicant’s and Reviewer’s Guides that were published in 1992 and make changes that would bring them in line with the methods and conditions that have emerged since then. This guide is intended to establish a standard framework for traffic impact analysis within Indiana, increasing consistency in study requests, preparation and review. A standardized procedure will enable the TIA study preparer to present the study findings and recommendations in a systematic manner consistent with the reviewer's expectations. The guide is not intended to make things more complicated and time-consuming. On the contrary, with a standard framework, the time involved in the process will decrease for both parties. The Applicant's Guide allows enough flexibility to the study preparer to use innovative methods based on sound engineering judgment and the conditions at a specific site. However, this should be done with the prior consent of the study reviewer(s).

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traffic impact analysis, traffic impact studies, access management

SPR Number


Performing Organization

Joint Transportation Research Program

Publisher Place

West Lafayette, Indiana

Date of this Version