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This page provides tools to assist local governments, consultants and TxDOT staff in meeting environmental compliance obligations regarding indirect and cumulative impacts assessment. Questions? Contact the Environmental Affairs Division's indirect and cumulative specialist at (512) 416-2698.

Title Date Description Format
TxDOT Environmental Handbook: Indirect and Cumulative Impacts 03/14 Outlines the steps to conduct and document thorough and defensible analysis of indirect induced growth and/or cumulative impacts for a transportation project.
American Association of State Highway and Transportation Officials (ASHTO) Practitioner’s Handbook 12: Assessing Indirect Effects and Cumulative Impacts Under the National Environmental Policy Act (NEPA)   The handbook focuses on the assessment of indirect effects and cumulative impacts for  transportation projects. It also briefly describes approaches for using the statewide and metropolitan transportation planning process.
Questions and Answers About Indirect and Cumulative Impacts in the NEPA Process   Federal Highway Administration's responses to frequently asked questions regarding indirect and cumulative impact analysis.
Strategic Highway Research Program (SHRP2) Capacity Research – Interactions Between Transportation Capacity, Economic Systems and Land Use   Information on the development of a large database of case studies and a web-based transportation project impact case studies (T-PICS) tool that allow for more rapid assessment of the long-term economic impacts of highway capacity projects.
Transportation Project Impact Case Studies   The T-PICS web-based tool provides transportation planners with a way to search for relevant case studies by type of project and setting. The case studies include details of the projects, their impacts, and factors affecting the impacts. The web tool also provides users with an option to specify the type of proposed project and see the range of likely impacts based on the studies.
Texas State Data Center   Use this site to gather data on population estimates and projections.
Eight Keys to Legally Sufficient Indirect and Cumulative Impacts' Analysis
  This FHWA white paper assists practitioners in producing a legally sufficient analysis.

Indirect Effects Guidance

Title Date Description Format
Indirect Induced Growth Impacts Decision Tree 04/14 Decision tree to help analysts determine if an induced growth analysis is necessary.
Indirect Induced Growth Risk Assessment 04/14 Checklist to determine the need or lack of need of an analysis.
Forecasting Indirect Land Use Effects of Transportation Projects   A report from the National Cooperative Highway Research Program (NCHRP) and AASHTO focuses on methods for estimating changes to land use. It provides complex methods of analysis that would be particularly helpful for projects requiring an environmental impact statement.
NCHRP Report 466 - Desk Reference for Estimating the Indirect Effects of Proposed Transportation Projects   This report contains detailed instruction on how to complete indirect impacts analysis. This report discusses some complex methods of analysis that would be particularly helpful for a project requiring an environmental impact statement.

Cumulative Impacts Guidance

Title Date Description Format
TxDOT’s Cumulative Impacts Analysis Guidelines 03/14 This guidance document focuses on the assessment of cumulative impacts that TxDOT projects have on the natural and human environment.
Cumulative Impacts Risk Assessment 04/14 Checklist to document the need or lack of need of analysis.
Cumulative Impacts Decision Tree 04/14 Decision tree to help analysts determine if a cumulative impacts analysis is necessary.
Consideration of Cumulative Impacts in EPA Review of NEPA Documents   This document provides insight to the U.S. Environmental Protection Agency’s perspective when reviewing cumulative effects' analyses.
Guidance on the Consideration of Past Actions in Cumulative Effects Analysis   CEQ guidance on the extent to which agencies of the Federal government are required to analyze the environmental effects of past actions when they describe the cumulative environmental effect of a proposed action.

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