US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter III — FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 397 — TRANSPORTATION OF HAZARDOUS MATERIALS; DRIVING AND PARKING RULESSubpart E — Preemption Procedures397.22149 C.F.R. § 397.221Timeliness.Last amended: 2016Year: 2026Length: 34 wordsOfficial source Cite as 49 C.F.R. § 397.221 (2026)If the Administrator fails to take action on the application within 90 days of serving the notice required by § 397.217(d), the applicant may treat the application as having been denied in all respects.Cross-references to the CFR397.217Previous49 C.F.R. § 397.215Next49 C.F.R. § 397.223