Updated Methods for Traffic Impact Analysis, Including Evaluation of Innovative Intersection Designs: Volume II—Applicant’s Guide

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\u27s 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\u27s 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)

Updated Methods for Traffic Impact Analysis, Including Evaluation of Innovative Intersection Designs: Volume I—Technical Report

In 1992, an Applicant’s Guide and a Reviewer’s Guide to Traffic Impact Analyses to standardize the methodologies for conducting traffic impact analyses (TIAs) in Indiana were developed for the Indiana Department of Transportation (INDOT). The methodologies were meant to help streamline the process of preparing and reviewing TIAs. The methodology is applicable for other transportation and government entities as well. Because 20 years have passed since the publication of the guides, INDOT wished to evaluate how effective the guides have been, determine what in the guides has worked well, revise parts of the guides that have not worked well, and add improvements and changes that have occurred since the guides’ publication. Brief explanations of innovative intersection alternatives such as roundabouts, median U-turns (MUT), restricted-crossing U-turns (RCUT), displaced left-turns (DLT), and quadrant roadways (QR) are provided to increase awareness of these possible designs. Some of the innovative designs were compared against a two-way stop-controlled intersection and a conventional signalized intersection for varying volumes on minor street approaches. The median U-turn design seemed to perform better at higher, more balanced flows whereas the roundabout performed better for unbalanced flows. At times, a development affects roads in more than one jurisdiction. Ideas are presented that may facilitate the inclusion of all affected parties early in the development process to improve communication, address all possible effects of the development and better satisfy all affected parties

Updated Methods for Traffic Impact Analysis, Including Evaluation of Innovative Intersection Designs: Volume III—Reviewer’s Guide

The INDOT Reviewer’s Guide to Traffic Impact Analysis (TIA) is a product of SPR-3605 Updated Methods for Traffic Impact Analysis. It is intended to provide guidance to individuals who are charged with the responsibility to evaluate the Traffic Impact Analysis (TIA) reports submitted to INDOT (or other public agencies). This guide replaces the 1992 Reviewer\u27s Guide for Traffic Impact Studies. The 1992 Guide was essentially an extended version of the 1992 Applicant\u27s Guide to Traffic Impact Studies. This time, the Reviewer’s Guide is written with the knowledge that the Applicant’s Guide is available to both applicants and reviewers. The 2013 Reviewer’s Guide focuses on added information that may help the reviewer assess the TIA report contents