American Association of State Highway and Transportation Officials - Publications

Publications

Some noteworthy AASHTO publications are:

  • A Policy on Geometric Design of Highways and Streets, often called "The Green Book" because of the color of its cover. This book covers the functional design of roads and highways including such things as the layout of intersections, horizontal curves and vertical curves.
  • Standard Specifications for Transportation Materials and Methods of Sampling and Testing.
  • AASHTO LRFD Bridge Design Specifications. This manual is the base bridge design manual that all DOTs use across the US.

In addition to its publications, AASHTO performs or cooperates in research projects. One such project is the AASHO Road Test, which is a primary source of data used when considering transport policies and the structural design of roads. Much of AASHTO's current research is performed by the National Cooperative Highway Research Program (NCHRP) which is administered by the Transportation Research Board (TRB) of the National Research Council.

The AASHTO Materials Reference Laboratory (AMRL) accredits laboratories. AMRL accreditation is often required to submit test results to State DOTs. For example, a contract for the construction of a highway bridge may require a minimum compressive strength for the concrete used. The contract will specify AASHTO Test Designation T22 "Compressive Strength of Cylindrical Concrete Specimens" as the means of determining compressive strength. The laboratory performing T22 will be required to be accredited by AMRL in that test.

AASHTO coordinates the numbering of Interstate Highways, U.S. Highways and U.S. Bicycle Routes.

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