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Environmental Review Toolkit


President Obama signed the Moving Ahead for Progress in the 21st Century Act (MAP-21) (P.L. 112-141) into law on July 6, 2012, with an effective date of October 1, 2012. MAP-21, a two-year funding bill, is the first long-term highway authorization enacted since 2005.

MAP-21 creates a streamlined and performance-based surface transportation program and builds on many of the highway, transit, bicycle, and pedestrian programs and policies established in 1991. MAP-21 promotes accelerating project delivery and encourages innovation through the increased use of Categorical Exclusions, programmatic approaches, and planning and environment linkages (§ 1310).


Subject/Title - Law/Regulation Reference Resource URL
Categorical Exclusions (CEs)
General Questions and Answers on CEs affected by MAP-21 – 23 CFR 771.117 Q&A
Multimodal Projects – 23 U.S.C. 304 Q&A
Emergencies – 23 CFR 771.117(c)(9) Final Rule
Projects within Right-Of-Way – 23 CFR 771.117(c)(22) Final Rule
Projects of Limited Federal Assistance – 23 CFR 771.117(c)(23) Final Rule
Programmatic Agreements and Additional Categorical Exclusions – 23 CFR 771.117(g) Final Rule
Environmental Review
MAP-21 Section 1309 – Accelerating Completion of Complex Projects within 4 Years Questions & Answers Q&A
Section 139 Q&A Guidance Addressing Flexibilities in Programmatic Agreements, Liaison Agreements, etc. and Statue of Limitations - 23 U.S.C. § 139 Q&A
Initial Guidance on Use of Errata Sheets and Combined FEIS and ROD Q&A
Financial Penalties – 23 U.S.C. 139(h)(6) Q&A
Integration of Planning and Environmental Review – 23 U.S.C. 168 Q&A
Final Guidance on Use of Errata Sheets and Combined FEIS and ROD Final Guidance
Memoranda of Agency Agreements for Early Coordination and Technical Assistance Q&A
NEPA Assignment Programs – 23 U.S.C. 326 and 327
State Assumption of Responsibility for Categorical Exclusions (CE Assignment) – 23 U.S.C. 326 Q&A
Surface Transportation Project Delivery Program (Program/Project Assignment) – 23 U.S.C. 327 Final Rule
Environmental Mitigation
Environmental Mitigation under NHPP and STP Q&A
Development of Programmatic Mitigation Plans – 23 U.S.C. 169 Q&A
Section 4(f)
Guidance on Section 4(f) Exception for Federal Lands Transportation Facilities under MAP-21 Memorandum

For more information on MAP-21, visit the FHWA MAP-21 website or the U.S. DOT MAP-21 website.