CFR›Title 23›Chapter I›Part 620 ContainsSubparts A–BCorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 620—ENGINEERING Subparts A Subpart A—Highway Improvements in the Vicinity of Airports Sections 620.101–620.104 B Subpart B—Relinquishment of Highway Facilities Sections 620.201–620.203 Authority23 U.S.C. 315 and 318; 49 CFR 1.48, 23 CFR 1.32.Source39 FR 33311, Sept. 17, 1974, unless otherwise noted. Previous 515 Part 515—Asset Management Plans Next 624 Part 624—Interstate System Access