CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 105–199)
- SUBCHAPTER A—HAZARDOUS MATERIALS AND OIL TRANSPORTATION (Parts 105–110)
- SUBCHAPTER B—OIL TRANSPORTATION (Parts 130–130)
- SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS (Parts 171–181)
- SUBCHAPTER D—PIPELINE SAFETY (Parts 186–199)