US lawFederal (United States)RegulationsTitle 23 CFR — HighwaysChapter III — NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATIONPart 1340 — UNIFORM CRITERIA FOR STATE OBSERVATIONAL SURVEYS OF SEAT BELT USESubpart B — Survey Design Requirements1340.423 C.F.R. § 1340.4In general.Last amended: 2017Year: 2026Length: 17 wordsOfficial source Cite as 23 C.F.R. § 1340.4 (2026)This subpart sets forth the minimum design requirements to be incorporated in surveys conducted under this part.Next23 C.F.R. § 1340.5