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Promote a safe environment with our 14x20 inch "Notice To Truckers Open Rear Doors Before Backing Into Dock" caution sign, crafted from economical 0.040-inch polystyrene plastic. This weather-resistant sign is ideal for indoor and outdoor use, with pre-drilled holes and rounded corners for secure mounting. It ensures safe docking procedures, reducing risks. Sold individually, this sign offers durability and visibility.