46 U.S.C. § 40704 — Commission review

(a) Request for Justification: If the Commission asks, a controlled carrier must, within 20 days, file a statement justifying an existing or proposed rate, charge, classification, rule, or regulation -- detailed enough for the Commission to reasonably judge whether it's lawful. (b) Determination: Within 120 days of getting that justification, the Commission must decide whether the rate, charge, classification, rule, or regulation might be unjust and unreasonable. (c) Show Cause Order: If the Commission believes a controlled carrier's published or charged rate, charge, classification, rule, or regulation might be unjust and unreasonable, it must order the carrier to show cause why it shouldn't be banned. (d) Suspension Pending Determination (1) Not yet effective: While that proceeding is pending, the Commission can suspend the rate, charge, classification, rule, or regulation any time before it takes effect. (2) Already effective: If it's already in effect, the Commission can suspend it -- once it issues a show-cause order -- with at least 30 days' notice to the carrier. (3) Maximum suspension: A suspension can't last more than 180 days. (e) Replacement During Suspension: While a rate, charge, classification, rule, or regulation is suspended, the carrier may publish a new one to take effect right away in its place -- but the Commission can reject the replacement if it believes that one is also unjust and unreasonable.