Like other large-scale structures, the Rio-Niterói Bridge was designed to allow for movement. This feature is crucial, as the bridge is exposed not only to drastic temperature variations but also to various weather conditions such as wind and rain. When temperatures rise, the structures expand and “lengthen.” On cooler days, the opposite occurs—they contract, becoming “shorter.”

For this reason, all bridges, especially those with large spans like the Rio-Niterói Bridge, are built with gaps between structural components, where expansion joints are installed. These joints not only prevent rainwater from seeping through and damaging the structural elements but also help ensure a smoother ride for vehicles.