Bridge expansion joints are essential components in bridge construction that allow for the natural movement of the bridge structure. As temperatures change, materials expand and contract, and these joints accommodate that movement, preventing damage to the bridge. These joints are typically made from flexible materials like rubber or metal and are strategically placed at various points along the bridge. By absorbing the stresses caused by temperature fluctuations, traffic loads, and other factors, bridge expansion joints help maintain the integrity and safety of the bridge over time.