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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 ...
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.
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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 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).
The process of grading a soil is in accordance with either the Unified Soil Classification System or the AASHTO Soil Classification System. The steps in grading a soil are data collection, calculating coefficients of uniformity and curvature, and grading the soil based on the grading criteria given in the used soil classification system. [1]
Highway designs in the US are subject to the AASHTO specifications, [4] [6] but the text does not contain specific procedures and recommendations. [2] Railway bridges are built according to the "Manual for Railway Engineering" [12] published by the American Railway Engineering and Maintenance-of-Way Association (AREMA).
The USBRS was established in 1978 by AASHTO for the purpose of "facilitat[ing] travel between the states over routes which have been identified as being more suitable than others for cycling." [ 8 ] The first routes were defined in 1982: U.S. Bicycle Route 1 (USBR 1) from North Carolina to Virginia, and the stretch of USBR 76 from Illinois ...