American Association of State Highway and Transportation Officials (AASHTO)
The American Association of State Highway and Transportation Officials (AASHTO) promotes transportation-related policies and technical excellence within the transportation community. As part of this mission, AASHTO serves as the leading source for technical information covering transportation design, construction and maintenance.
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
The AASHTO Standards Collection contains more than 1,500 documents.
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.