The AASHTO Guide Specifications for Bridges Subject to Tsunami Effects, First Edition (2022), provide design provisions for highway bridges exposed to tsunami loading. The introduction covers background, applicability, the overall design approach, and performance criteria for tsunami-resistant bridge design. A hazard section describes offshore probabilistic tsunami hazard analysis and sets out two analysis levels, a level 1 transect approach based on energy grade line analysis and a level 2 numerical modeling approach, together with estimation of flow direction. The loads section defines tsunami load cases and superstructure loads, including horizontal forces, vertical forces, and the resulting moments on bridge components. The specifications were developed through a pooled fund study involving several coastal states and the Federal Highway Administration. They are intended for engineers designing or evaluating bridges in tsunami-prone coastal regions.