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Maximize dock safety with our large 14x20 inch "Notice To Truckers Open Rear Doors Before Backing Into Dock" caution sign, made from 0.040-inch aluminum. This UV-resistant and corrosion-proof sign is built for harsh conditions, with pre-drilled holes and rounded corners for easy installation. Perfect for prominent display at loading docks, it prevents accidents. Sold per piece, this sign is a vital safety tool.