|FHWA > Highway Statistics 2008 > Table HM-12|
Highway Statistics 2008
Public Road Length - 2008 1/ Miles by Type of Surface and Ownership/Functional System National System
1/ Includes the 50 States, the District of Columbia and Puerto Rico. Some differences from other tables may be noted because these are estimated from sample and summary data; samples entirely on structures are not included. Indiana excludes 788 miles of Federal agency owned roads.
2/ Paved includes the following categories: Low type—an earth, gravel, or stone roadway which has a bituminous surface course less than 1” thick suitable for occasional heavy loads; Intermediate Type—a mixed bituminous or bituminous penetration roadway on a flexible base having a combined surface and base thickness of less than 7”; High-Type Flexible—a mixed bituminous or bituminous penetration roadway on a flexible base having a combined surface and base thickness of 7” or more; also includes brick, block, or combination roadways; High-Type Composite—a mixed bituminous or bituminous penetration roadway of more than 1” compacted material on a rigid base with a combined surface and base thickness of 7” or more; High-Type Rigid—a Portland Cement Concrete roadway with or without a bituminous wearing surface of less than 1”.
3/ Prior to 1999 included other state agency roads.
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