2005 Federal Sentencing Guidelines
Chapter 2 - PART D - OFFENSES INVOLVING
DRUGS 
§2D2.3. Operating or Directing the Operation of a Common Carrier
Under the Influence of Alcohol or Drugs
(a) Base Offense Level (Apply the greatest):
  (1) 26, if death resulted; or
  (2) 21, if serious bodily injury
    resulted; or
  (3) 13, otherwise.
(b) Special Instruction:
  (1) If the defendant is convicted of a single count involving the death
    or serious bodily injury of more than one person, apply Chapter Three, Part
    D (Multiple Counts) as if the defendant had been convicted of a separate
    count for each such victim.
Commentary
Statutory Provision: 18 U.S.C. § 342.
Background: This section
  implements the direction to the Commission in Section 6482 of the Anti-Drug
  Abuse Act of 1988. Offenses covered by this guideline may vary widely with
  regard to harm and risk of harm. The offense levels assume that the offense
  involved the operation of a common carrier carrying a number of passengers, e.g.,
  a bus. If no or only a few passengers were placed at risk, a downward departure
  may be warranted. If the offense resulted in the death or serious bodily injury
  of a large number of persons, such that the resulting offense level under subsection
  (b) would not adequately reflect the seriousness of the offense, an upward
  departure may be warranted.
Historical Note: Effective
  November 1, 1987. Amended effective January 15, 1988 (see Appendix
  C, amendment 25); November 1, 1989 (see Appendix
  C, amendment 141).