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Channeling DevicesBarricades, vertical panels, drums, and cones are the most commonly used devices to alert drivers of unusual or potentially dangerous conditions in highway and street work zones. These devices are used to guide the drivers safely through the work area, and at night, they may be equipped with warning lights. When a Road Closed sign is displayed, do not drive on this road. Look for a detour or another route. Stripes on barricades and panel devices slope downward in the direction traffic must travel.

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