Per NMDOT 2019 618.2.1, which certification requirement applies to a traffic control supervisor but is not required of a traffic control technician?

1. Successful completion of a Department-approved work-zone traffic-control course
2. Passing a written examination on a work-zone traffic-control course
3. Possession of a flagger training certificate
4. At least one year of full-time field experience in work-zone traffic control, verified by the agency or firm