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From West Virginia Division of Highways (WVDOH) Construction Manual:
“636.1.6 Flagger Certification
All flaggers on WVDOH projects must be certified by passing a WVDOH or American Traffic Safety Service Association training course on this subject. Re-certification is generally required every two years and usually involves reviewing the course manual, viewing a training video, and obtaining a passing score on a proficiency test administered by the proctor.”
From West Virginia Parkways Authority Special Provisions for Section 636 - Maintaining Traffic:
"All flaggers must have a current and valid certification by the American Traffic Safety Services Association (ATSSA) at the time of work."