Flagger training and certification requirements

From Vermont Agency of Transportation Standard Specifications for Construction Book:
“630.04 FLAGGERS.
(a) Requirements. A Flagger shall be a person who has successfully completed the American Traffic Safety Services Association (ATSSA) approved Flagger training course or another course as approved by the Engineer. Flaggers shall always carry their Flagger training course certification when on the Project site. It shall be the Contractor’s responsibility to verify that Flaggers meets the requirements as specified herein.”