CFR›Title 23›Chapter I›Part 668 ContainsSubparts A–BCorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 668—EMERGENCY RELIEF PROGRAM Subparts A Subpart A—Procedures for Federal-Aid Highways Sections 668.101–668.113 B Subpart B—Procedures for Federal Agencies for Federal Roads Sections 668.201–668.215 Authority23 U.S.C. 101, 120(e), 125 and 315; 49 CFR 1.48(b). Previous 667 Part 667—Periodic Evaluation of Facilities Repeatedly Requiring Repair and Reconstruction Due to Emergency Events Next 669 Part 669—Enforcement of Heavy Vehicle Use Tax