AASHTO HBSLD-1, Guide Specification for Service Life Design of Highway Bridges, First Edition (2020), gives agencies a quantitative framework for designing bridges to a defined service life. Eight sections cover introduction and classification, general design guidelines, concrete structures, steel structures, foundations and retaining walls, renewable elements, and life cycle cost analysis. Section 3 treats service life considerations in the design process, including planning, global design, and deterioration experience. It then sets out general durability considerations for drainage, deck detailing, joints, bearings, utilities, wildlife, access and inspection, and construction and preservation. Documentation requirements, including a service life design report, are also defined. The guide is written for bridge design agencies and engineers who want to complement deemed-to-satisfy provisions with explicit service life criteria on a national basis.