49 CFR 601.29: Additional rulemaking proceedings.

The Administrator may initiate further rulemaking proceedings. For example, interested persons may be invited to make oral arguments, to participate in conferences between the Administrator or his/her representative at which minutes of the conference are kept, to appear at informal hearings presided over by officials designated by the Administrator at which a transcript or minutes are kept, or participate in any other proceeding to assure informed administrative action and to protect the public interest.