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The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States. Despite its name, the association represents not only highways but air, rail, water, and public ...
CTPP data are available online and can be accessed using an online database housed on the CTPP website or downloaded via an FTP site. This portal contains the CTPP tabulations from the 1990 decennial census, the 2000 decennial census, the 2006-2010 5-year ACS, and 2012-2016 5-year ACS.
The AASHTO Soil Classification System was developed by the American Association of State Highway and Transportation Officials, and is used as a guide for the classification of soils and soil-aggregate mixtures for highway construction purposes.
Public Safety Standards, United States (Federal Government) – Offers free downloads of documents, including AASHTO's "A Policy on Design Standards", that have been incorporated by reference into the US Code of Federal Regulations and can therefore be freely copied as edicts of government.
The route numbers and locations are coordinated by the American Association of State Highway and Transportation Officials (AASHTO). [4] The only federal involvement in AASHTO is a nonvoting seat for the United States Department of Transportation. Generally, most north-to-south highways are odd-numbered, with the lowest numbers in the east and ...
The present serviceability index (PSI) is a pavement performance measure.Introduced by the American Association of State Highway and Transportation Officials (AASHTO), the PSI is one of the most widely used pavement performance indicators after pavement condition index (PCI) and international roughness index (IRI).
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The American Association of State Highway and Transportation Officials (AASHTO; before 1973, the American Association of State Highway Officials, AASHO), among many other functions, is the organization in charge of assigning designations for United States Numbered Highway System (U.S. Highways) through its Special Committee on U.S. Route ...