IHS is your source for AASHTO standards and publications.
AASHTO is a nonprofit, nonpartisan association representing highway and
transportation departments in the 50 states, the District of Columbia, and
Puerto Rico. It represents all five transportation modes: air, highways,
public transportation, rail, and water. Its primary goal is to foster the
development, operation, and maintenance of an integrated national
As the voice of transportation, AASHTO works to educate the public and key
decision makers about the critical role that transportation plays in
securing a good quality of life and sound economy for our nation. AASHTO
serves as a liaison between state departments of transportation and the
Federal government. AASHTO is an international leader in setting technical
standards for all phases of highway system development. Standards are
issued for design, construction of highways and bridges, materials, and
many other technical areas.
AASHTO serves as a catalyst for excellence in transportation by offering
smart solutions and promising practices; critical information, training and
data; direct technical assistance to states; and unchallenged expertise.
IHS carries all AASHTO specifications, provisional standards, standard test
methods, recommended practices, guide specifications, manuals, the Bridge
Welding Code, annual meeting procedures, the Reference Book of Member
Department Personnel & Committees, U.S. Numbered Highways, and interstates