49 CFR §374.319

1. (a)Petitions. Where compliance with any rule would impose an undue burden on a carrier, it may petition the Federal Motor Carrier Safety Administration either to treat it as though it were conducting a commuter service or to waive the rule. The request for relief must be justified by appropriate verified statements.
2. (b)Notice to the public. The carrier shall display conspicuously, for at least 30 days, in each facility and on each bus affected, a notice of the filing of any petition. The notice shall contain the carrier's name and address, a concise description of and reasons for the relief sought, and a statement that any interested person may file written comments with the Federal Motor Carrier Safety Administration (with one copy mailed to the carrier) on or before a specific date that is at least 30 days later than the date the notice is posted.