49 CFR 209.17: Motions.

Motions shall be in writing, filed with the presiding officer, and copies served upon the parties in accordance with § 209.5, except that oral motions may be made during the course of any hearing or appearance before the presiding officer. Each motion shall state the particular order, ruling, or action desired and the grounds therefor. Unless otherwise specified by the presiding officer, any objection to a written motion must be filed within 10 days after receipt of the motion.