CFR›Title 23›Chapter I›Part 660 ContainsSubparts A–ECorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 PART 660—SPECIAL PROGRAMS (DIRECT FEDERAL) Subparts A-D Subparts A-D [Reserved] E Subpart E—Defense Access Roads Sections 660.501–660.519 Authority23 U.S.C. 210, 315; 49 CFR 1.48. Previous 658 Part 658—Truck Size and Weight, Route Designations—Length, Width and Weight Limitations Next 661 Part 661—Tribal Transportation Facility Bridge Program (TTFBP)