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Indirect Effects/Cumulative Impacts

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The Indirect Effects/Cumulative Impacts topic describes a range of policies, case studies, and resources related to evaluation of indirect effects and cumulative impacts in surface transportation. Transportation agencies consider indirect effects and cumulative impacts of projects in satisfying requirements of the National Environmental Policy Act.

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Recent Developments

• FHWA Issues Instructions on Travel and Land Use Forecasting
• Montana DOT Develops Process to Assess Indirect Effects of Transportation Projects
• Florida DOT Issues Guidance on Cumulative Effects Evaluation

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Key Resources

• Assessing Indirect Effects and Cumulative Impacts under NEPA (AASHTO Practitioners Handbook #12) and associated webinar and resources
• Considering Cumulative Effects under the National Environmental Policy Act (CEQ, 1997)
• Questions and Answers Regarding the Consideration of Indirect and Cumulative Impacts in the NEPA Process (FHWA, 2003)
• NCHRP Report 466, Desk Reference for Estimating the Indirect Effects of Proposed Transportation Projects (2002)
• NCHRP 25-25 Task 43, Legal Sufficiency Criteria for Adequate Indirect Effects and Cumulative Impacts Analysis as Related to NEPA Documents (2008)
• NCHRP 25-25, Task 22, Forecasting Indirect Land Use Effects of Transportation Projects (2007)
• NCHRP 25-25 Task 11: A Review and Synthesis of the Requirements for Indirect and Cumulative Impact Analysis and Mitigation under Major Environmental Laws and Regulations (2006)
• NCHRP 25-25 Task 3: Handbook on Integrating Land Use Considerations into Transportation Projects to Address Induced Growth (2005)

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