CFR›Title 46›Chapter II›Part 393 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 393—AMERICA'S MARINE HIGHWAY PROGRAM Subparts A Subpart A—General Provisions Section 393.1 B Subpart B—Marine Highway Route and Project Designations Sections 393.2–393.3 C Subpart C—Department of Transportation Efforts To Foster and Support America's Marine Highways Sections 393.4–393.6 AuthorityPub. L. 110-140, title XI, subtitle C, sections 1121-1123, 121 Stat. 1494; Pub. L. 112-213, title IV, section 405, 126 Stat. 1541; 49 CFR 1.92 and 1.93(a), 46 U.S.C. 55601, 55604, 55605.Source82 FR 56904, Dec. 1, 2017, unless otherwise noted. Previous 391 Part 391—Federal Income Tax Aspects of the Capital Construction Fund