United States Department of Transportation
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Road Function Classifications
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2000-11-01
[PDF-1.30 MB]
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Abstract:The U.S. DOT’s Federal Highway Administration (FHWA) classifies our Nation’s urban and rural roadways by road function. Each function class is based on the type of service the road provides to the motoring public, and the designation is used for data and planning purposes. Design standards are tied to function class. Each class has a range of allowable lane widths, shoulder widths, curve radii, etc. The following photos and information illustrate the four major road function classifications: Interstates, Other Arterials, Collectors, and Local roads. The amount of mobility and land access offered by these road types differs greatly.
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