How can I safely transport plywood by carrying it on a roof rack?

To safely transport plywood on a roof rack, ensure the plywood is securely tied down using ratchet straps or bungee cords. Place a protective layer, like a tarp or blanket, between the plywood and the roof rack to prevent scratches. Double-check the straps periodically during the journey to ensure they remain tight and secure. Drive cautiously and avoid sudden movements to prevent the plywood from shifting or falling off the roof rack.