Updated regularly. The American Association of State Highway and Transportation Officials (AASHTO) promotes transportation-related policies and technical excellence within the transportation community. AASHTO standards and specifications include provisional standards, standard test methods, recommended practices, guide specifications, and manuals.
General subject categories covered by AASHTO standards include:
- Administration and economics
- Bridges and structures
- Construction and right-of-way
- Design and traffic
- Planning and environment
- Rail and highway transport
Designers, engineers, researchers, construction managers, and inspectors use standards and documents from AASHTO to support quality and safe design and execution of road construction and transportation projects.