American Association of State Highway and Transportation Officials (AASHTO)

AASHTO Website



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.

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