An official website of the State of Oregon
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Flagging, and flaggers, are typically used when one lane of a road is closed and traffic must share the remaining lane. Flagging operations must accommodate all vehicles on the road, including non-motorized vehicles. Flaggers, who have completed formal training and have certification in Oregon, Washington, Idaho, or Montana, may practice as a certified flagger in Oregon. Flaggers must also be at least 18.
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Manual on Uniform Traffic Control Devices U.S. Dept. of Transportation
Oregon Temporary Traffic Control Handbook Oregon Dept. of Transportation
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A spotter is not a flagger. A spotter is someone whose sole duty is to provide immediate warning of approaching vehicles, equipment, or other hazards to coworkers.
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