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23 U.S.C. 402; delegation of authority at 49 CFR 1.50.
76 FR 18056, Apr. 1, 2011, unless otherwise noted.
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After NHTSA approval of a survey design, States shall submit for NHTSA approval any proposed alteration to their survey design, including, but not limited to, sample design, seat belt use rate estimation method, variance estimation method and data collection protocols, at least three months before data collection begins.