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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.
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 ...
US 14, US 16, US 20 in Greybull, WY: I-90, US 212 in Laurel, MT: 1926: current Wyoming signs the eastern (southern) end where AASHTO has it join US 14/US 16/US 20 west of Greybull US 311: 62.4: 100.4 US 52 in Winston-Salem, NC: US 58 Bus. near Danville, VA: 1926: current US 312: 234: 377 Broadus, MT: Yellowstone National Park: 1960
Minimum design speed: A minimum design speed of 70 mph (113 km/h) is to be used, except in mountainous and urban areas, where the minimum is 50 mph (80 km/h). [ 4 ] The sight distance , curvature and superelevation of the highway should follow the current edition of AASHTO's A Policy on Geometric Design of Highways and Streets for the chosen ...
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 Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil.The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol.
On May 20, 2019, the American Association of State Highway and Transportation Officials (AASHTO) approved a request to establish Future I-274. Justification given by NCDOT was that the 16.83-mile (27.09 km) section would satisfy a great need to alleviate congestion in Winston-Salem and connect the western portion of the urbanized area.
US 20: 428.39: 689.43 US-20 at Wyoming border near Harrison: I-129/US-20/US-75 at Iowa border in South Sioux City: 1926: current Portion between the Wyoming state line and Valentine is known as the Bridges to Buttes Byway [3] US 26: 150.79: 242.67 US-26 at Wyoming border near Torrington, Wyoming: I-80/N-61 in Ogallala: 1926: current US 26N — —