Corrosion is a major concern for aging steel bridges because progressive material loss can affect their long-term serviceability and, in severe cases, structural safety. Visual inspection remains indispensable for assessing bridge condition, but inspectors must evaluate corrosion under widely varying conditions, including differences in lighting, coating color, shadows, surface deposits, structural geometry and accessibility. These factors can make consistent corrosion assessment challenging.Corrosion is a major concern for aging steel bridges because progressive material loss can affect their long-term serviceability and, in severe cases, structural safety. Visual inspection remains indispensable for assessing bridge condition, but inspectors must evaluate corrosion under widely varying conditions, including differences in lighting, coating color, shadows, surface deposits, structural geometry and accessibility. These factors can make consistent corrosion assessment challenging.Engineering[#item_full_content]