49 CFR § 386.34 - Motions.
(a) General. An application for an order or ruling not otherwise covered by these rules shall be by motion. All motions filed prior to the calling of the matter for a hearing shall be to the Assistant Administrator. All motions filed after the matter is called for hearing shall be to the administrative law judge.
(b) Form. Unless made during hearing, motions shall be made in writing, shall state with particularity the grounds for relief sought, and shall be accompanied by affidavits or other evidence relied upon.
(c) Answers. Except when a motion is filed during a hearing, any party may file an answer in support or opposition to a motion, accompanied by affidavits or other evidence relied upon. Such answers shall be served within 20 days after the motion is served or within such other time as the Assistant Administrator or administrative law judge may set.