US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter V — NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 555 — TEMPORARY EXEMPTION FROM MOTOR VEHICLE SAFETY AND BUMPER STANDARDSSubpart B — Vehicles Built in Two or More Stages and Altered Vehicles555.1549 C.F.R. § 555.15Time period for exemptions.Last amended: 2016Year: 2026Length: 38 wordsOfficial source Cite as 49 C.F.R. § 555.15 (2026)Subject to § 555.16, each temporary exemption granted by the Administrator under this subpart shall be in effect for a period of three years from the effective date. The Administrator shall identify each exemption by a unique number.Cross-references to the CFR555.16Previous49 C.F.R. § 555.14Next49 C.F.R. § 555.16