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Protect workers with our cost-effective 10x14 inch "Notice To Truckers Open Rear Doors Before Backing Into Dock" caution sign, made from 0.040-inch polystyrene plastic. This weather-resistant sign is perfect for indoor and outdoor use, with pre-drilled holes and rounded corners for secure mounting. It promotes safe docking, ensuring safety. Sold per unit, this sign combines affordability with performance.