Flagger training and certification requirements
From Maryland State Highway Administration (SHA) Frequently Asked Work Zone Questions web site:
“A flagger receives a flagger card on the successful completion of the SHA- or ATSSA-provided flagger’s course. A flagger must successfully complete the SHA- or ATSSA-provided flagger’s course in order to be deployed in Maryland work zones. Exceptions for approved flaggers can be made during emergency situations, where a non-approved flagger may be deployed for up to 15 minutes.”
Information about flagger training programs are available on the web site below.