23 CFR § 1340.12
Re-selection of observation sites
May 21, 2020
(a) Re-selection of observation sites. States shall re-select observation sites using updated sampling frame data, as described in §1340.5(a), no less than once every five years.
(b) Re-selection submission deadline. States shall submit updated sampling frame data meeting the requirements of §1340.5(a) for NHTSA approval no later than March 1 of the re-selection year.