Prepare to be a Flagger for work zone traffic control. Learn the basics of flagging and traffic control. Receive State of Oregon Department of Transportation Credentials for Flaggers. Valid for three years in Oregon, Washington, Idaho and Montana. Class fee includes textbooks. Class is held online. Must be 18 or older to get a job as a Flagger. Information: 541-440-4668. Fee $139 or $149.50 if you need your materials shipped.