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2 ââ NCHRP LRD 89 CONTENTS I. Introduction, 3 A. Overview of Planning and Environment Linkages, 3 B. Objectives of this Digest, 4 II. PEL Legal Authorities, 4 A. Early Environmental Review and Transportation Planning, 4 B. Evolution of Planning and Environment Linkages: Key Statutory and Regulatory Authorities, 5 C. Agency Guidance and Policy, 13 D. Comparison of Different PEL Authorities and Conditions, 17 III. Various Approaches to PEL, 17 A. Federal PEL Program, 18 B. Selected Examples of PEL Implementation, 18 IV. PEL-Related Litigation, 20 V. PEL Going Forward, 22 A. PEL Here to Stay, 23 B. Reduced Risks of Litigation and Rulings Adverse to Projects, 23 C. Best Practices, 23 D. Barriers to Implementation, 23
