• Part 600 - PART 600 [RESERVED]

• Part 601 [§ 601.1 - § 601.47] - PART 601—ORGANIZATION, FUNCTIONS, AND PROCEDURES

• Part 602 [§ 602.1 - § 602.17] - PART 602—EMERGENCY RELIEF

• Part 604 [§ 604.1 - § 604.50] - PART 604—CHARTER SERVICE

• Part 605 [§ 605.1 - § 605.40] - PART 605—SCHOOL BUS OPERATIONS

• Part 609 [§ 609.1 - § 609.23] - PART 609—TRANSPORTATION FOR ELDERLY AND HANDICAPPED PERSONS

• Part 611 [§ 611.101 - § 611.309] - PART 611—MAJOR CAPITAL INVESTMENT PROJECTS

• Part 613 [§ 613.100 - § 613.200] - PART 613—METROPOLITAN AND STATEWIDE AND NONMETROPOLITAN PLANNING

• Part 622 [§ 622.101 - § 622.301] - PART 622—ENVIRONMENTAL IMPACT AND RELATED PROCEDURES

• Part 625 [§ 625.1 - § 625.55] - PART 625—TRANSIT ASSET MANAGEMENT

• Part 630 [§ 630.1 - § 630.11] - PART 630—NATIONAL TRANSIT DATABASE

• Part 633 [§ 633.1 - § 633.29] - PART 633—PROJECT MANAGEMENT OVERSIGHT

• Part 639 - PART 639 [RESERVED]

• Part 640 [§ 640.1 - § 640.1] - PART 640—CREDIT ASSISTANCE FOR SURFACE TRANSPORTATION PROJECTS

• Part 650 [§ 650.1 - § 650.31] - PART 650—PRIVATE INVESTMENT PROJECT PROCEDURES

• Part 655 [§ 655.1 - § 655.83] - PART 655—PREVENTION OF ALCOHOL MISUSE AND PROHIBITED DRUG USE IN TRANSIT OPERATIONS

• Part 659 - PART 659 [RESERVED]

• Part 661 [§ 661.1 - § 661.21] - PART 661—BUY AMERICA REQUIREMENTS

• Part 663 [§ 663.1 - § 663.43] - PART 663—PRE-AWARD AND POST-DELIVERY AUDITS OF ROLLING STOCK PURCHASES

• Part 665 [§ 665.1 - § 665.27] - PART 665—BUS TESTING

• Part 666-669 - PARTS 666-669 [RESERVED]

• Part 670 [§ 670.1 - § 670.31] - PART 670—PUBLIC TRANSPORTATION SAFETY PROGRAM

• Part 671 - PART 671—XXX

• Part 672 [§ 672.1 - § 672.31] - PART 672—PUBLIC TRANSPORTATION SAFETY CERTIFICATION TRAINING PROGRAM

• Part 673 [§ 673.1 - § 673.31] - PART 673—PUBLIC TRANSPORTATION AGENCY SAFETY PLANS

• Part 674 [§ 674.1 - § 674.41] - PART 674—STATE SAFETY OVERSIGHT

• Part 675-699 - PARTS 675-699 [RESERVED]