|FHWA > Highway Statistics 2008 > Table HM-12M|
Highway Statistics 2008
Public Road Length - 2008 1/ Kilometers by Type of Surface and Ownership/Functional 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. Due to conversion from English to metric units and to rounding, individual cell values may not agree with corresponding mileage table cell values. Indiana excludes 1,268 kilometres 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 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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