49 CFR § 106.105 - PHMSA response to a petition for rulemaking.

We will review and respond to your petition for rulemaking as follows:

If your petition is . . .	And if we determine that . . .	Then . . .
(a) Incomplete		We may return your petition with a written explanation.
(b) Complete	Your petition does not justify a rulemaking action	We will notify you in writing that we will not start a rulemaking proceeding.
(c) Complete	Your petition does justify a rulemaking action	We will notify you in writing that we will start a rulemaking proceeding.