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At a roadracing event, a member of the officiating crew (or trackday organizer's staff) who watches the exit of corners for motorcycle (or other vehicle) crashes. Generally, cornerworkers hold flags to regulate the racetrack - red, black, blue, yellow, green, checkered, and meatball flags - and are equipped with fire-extinguishers and radios, and a strange will to stand in the hot sun all day while people crash all around them at over 150 MPH.
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