U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Table number footnotes guide.
HM10 | HM12 | HM14 | HM15 | HM16 | HM18 | HM20 | HM30 | HM31 | HM33 | HM35 | HM36 | HM37 | HM39 | HM40 | HM41 | HM42 | HM43 | HM44 | HM47 | HM48 | HM49 | HM50 | HM51 | HM53 | HM55 | HM57 | HM59 | HM60 | HM61 | HM62 | HM63 | HM64 | HM71 | HM72 | HM81 | VM2 | VM3
HM-10: Public Road Length - 2003 - Miles By Ownership
1/ Prior to 1999, municipal was included with other jurisdictions.
2/ Includes State park, State toll, other State agency, other local agency and other roadways not identified by ownership.
3/ Roadways in Federal parks, forests, and reservations that are not part of the State and local highway systems.
4/ 2002 data used.
HM-12: Public Road Length - 2003 - Miles By Type Of Surface And Ownership/Functional System National Summary
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. 2002 data used for Missouri.
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.
HM-14: Federal-Aid Highway Length - 2003 - Miles By Ownership
1/ Prior to 1999, municipal was included with other jurisdictions.
2/ Includes State park, State toll, other State agency, other local agency, and roadways not identified by ownership.
3/ Roadways in Federal parks, forests, and reservations that are not part of the State and local highway systems.
4/ 2002 data used.
HM-15: Federal-Aid Highway Length - 2003 - Miles By Ownership
1/ 2002 data used.
HM-16: Public Road Length 2003 - Miles By Ownership And Federal-Aid Highways National Summary
1/ Includes the 50 States, the District of Columbia, and Puerto Rico. 2002 data used for Missouri.
2/ Prior to 1999, municipal was included with other jurisdictions.
HM-18: Public Road Length 2003 - Miles By Functional System And Federal-Aid Highways National Summary
1/ Includes the 50 States, the District of Columbia and Puerto Rico. 2002 data used for Missouri.
HM-20: Public Road Length - 2003 - Miles By Functional System
1/ 2002 data used.
HM-30: National Highway System Length - 2003 - Miles Open And Not Open To Traffic
1/ 2002 data used.
HM-31: Federal-Aid Highway Length - 2003 - Miles By Type Of Surface
1/ Some differences from other tables may be noted because these are estimated from sample data; samples entirely on structures are not included.
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 less than 7"; High-Type Flexible-- a mixed bituminous or bituminous penetration roadway on a flexible base with a combined surface 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 7" or more; High-Type Rigid-- a Portland Cement Concrete roadway with or without a bituminous wearing surface of less than 1".
3/ 2002 data used.
HM-33: Federal-Aid Highway Length - 2003 - Miles By Lane Width
1/ Some differences from other tables may be noted because these are estimated from sample data and samples entirely on structures are included.
2/ 2002 data used.
HM-35: Federal-Aid Highway Length - 2003 - Miles By Traffic Lanes And Access Control
1/ Some differences from other tables may be noted because these are estimated from sample data and samples entirely on structures are not included. Differences may exist from prior years due to the redefinition of divided and undivided roadways in 1999.
2/ Includes 3-lane roadways, one-way streets, undivided multi-lane highways, etc. for Interstate, includes some 2-lane roadways.
3/ 2002 data used.
HM-36: Federal-Aid Highway Length - 2003 - Miles By Traffic Lanes And Access Control National Summary
1/ Includes the 50 States, the District of Columbia, and Puerto Rico. 2002 data used for Missouri.
2/ Some differences from other tables may be noted because these are estimated from sample data and do not include samples entirely on structures.
3/ Differences may exist from prior years due to the redefinition of divided and undivided roadways in 1999.
HM-37: Federal-Aid Highway Length - 2003 - Miles By Average Daily Traffic Volume
1/ Some differences from other tables may be noted because these are estimated from sample data and samples entirely on structures are included
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
HM-39: Federal-Aid Highway Length - 2003 - Miles By Lane Width, Access Control, And Average Daily Traffic Volume National Summary
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 data and do not include samples entirely on structures. California has been asked to review their 2003 data and may resubmit pending the resolution of review findings. 2002 data used for Missouri.
2/ Differences may exist from prior years due to a redefinition of divided and undivided roadways in 1999.
HM-40: National Highway System Road Length - 2003 - Miles By Ownership
1/ Prior to 1999, municipal was included with other jurisdictions.
2/ Includes State park, State toll, other State agency, other local agency, and other roadways not identified by ownership.
3/ Roadways in Federal parks, forests, and reservations that are not part of the State and local highway systems.
4/ 2002 data used.
HM-41: National Highway System Length - 2003 - Miles By Functional System
1/ 2002 data used.
HM-42: National Highway System Length - 2003 - Miles By Volume-Service Flow Ratio
1/ In 2001, updated capacity (service flow) calculation procedures were instituted in the HPMS data reporting process. The procedures are based on the Highway Capacity Manual 2000, published by the Transportation Research Board. For multilane facilities volume-service flow ratio is determined by dividing the peak traffic in the peak direction by the capacity. For all other facilities the ratio is determined by dividing the peak traffic by the capacity. Peak traffic is estimated as AADT *K, where K is the design hour volume (30th highest hour) as a percent of AADT. Some differences from other tables may be noted because these are estimated from sample data and do not include samples entirely on structures.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
HM-43: National Highway System Lane-Length - 2003 - Lane-Miles By Functional System
1/ Rural minor collector and rural/urban local functional system lane miles estimated by FHWA assuming two as the number of lanes.
2/ 2002 data used.
HM-44: National Highway System Travel - 2003 - Annual Vehicle-Miles By Functional System
1/ Travel for all systems are FHWA estimates based on State provided HPMS data.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
HM-47: National Highway System Length - 2003 - Miles By Measured Pavement Roughness
1/ Data are reported as the International Roughness Index (IRI) in inches per mile. Reference: World Bank Technical Paper Number 46, 1986. Lower IRI represents smoother riding roadways. To obtain a comprehensive assessment of pavement condition, additional measures of pavement distress are needed.
2/ May include sections entirely on structures and unpaved miles.
3/ 2002 data used.
HM-48: Federal-Aid Highway Lane - Length - 2003 - Lane-Miles By System
1/ May see differences from prior years; starting in 1999, number of lanes is coded for all systems except rural minor collector and rural/urban local. Rural minor collector and rural/urban local functional system lane-miles estimated by FHWA assuming two as the number of lanes.
2/ 2002 data used.
HM-49: Strategic Highway Corridor Network (STRAHNET) Length - 2003 - Miles By Interstate And Non-Interstate
1/ The STRAHNET includes highways which are important to the United States strategic defense. They provide defense access, continuity, and emergency capabilities for the movement of personnel, materials, and equipment.
2/ 2002 data used.
HM-50: Functional System Length - 2003 - Miles By Ownership
1/ Prior to 1999, municipal was included with other jurisdictions.
2/ Includes State park, State toll, other State agency, other local agency, and roadways not identified by ownership.
3/ Roadways in Federal parks, forest, and reservations that are not a part of the State and local highway systems.
4/ 2002 data used.
HM-51: Functional System Length - 2003 - Miles By Type Of Surface
1/ Some differences from other tables may be noted because these values are estimated from sample data and do not include samples entirely on structures.
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 with a combined surface 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/ 2002 data used.
HM-53: Functional System Length - 2003 - Miles By Lane Width
1/ Some differences from other tables may be noted because these are estimated from sample data; samples entirely on structures are included.
2/ 2002 data used.
HM-55: Functional System Length - 2003 - Miles By Traffic Lanes And Access Control
1/ Some differences from other tables may be noted because these are estimated from sample data; samples entirely on structures are not included.
2/ Differences may exist from prior years due to the redefinition of divided and undivided roadways in 1999.
3/ Includes 3-lane roadways, one-way streets, multi-lane 4-lane highways, etc.; for Interstate includes 2-lane roadways.
4/ 2002 data used.
HM-57: Functional System Length - 2003 - Miles By Average Daily Traffic Volume
1/ Some differences from other tables may be noted because these values are estimated from sample data; samples entirely on structures are included.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
HM-59: Functional System Length - 2003 - Miles By Lane Width, Access Control And Average Daily Traffic Volume National Summary
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 data; does not include samples entirely on structures. 2002 data used for Missouri. California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
2/ Differences may exist from prior years due to the redefinition of divided and undivided roadways in 1999.
HM-60: Functional System Lane-Length - 2003 - Lane-Miles
1/ May see differences from prior years, stating in 1999, number of lanes is coded for all systems except rural minor collector and rural/urban local.
2/ Rural minor collector and rural/urban local functional system lane miles estimated by FHWA assuming two as the number of lanes.
3/ 2002 data used.
HM-61: Functional System Length - 2003 - Miles By Volume-Service Flow Ratio
1/ In 2001, updated capacity (service flow) calculation procedures were instituted in the HPMS data reporting process. The procedures are based on the Highway Capacity Manual 2000, published by the Transportation Research Board. For multilane facilities volume-service flow ratio is determined by dividing the peak traffic in the peak direction by the capacity. For all other facilities the ratio is determined by dividing the peak traffic by the capacity. Peak traffic is estimated as AADT *K, where K is the design hour volume (30th highest hour) as a percent of AADT. Some differences from other tables may be noted because these values are estimated from sample data and do not include samples entirely on structures.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
HM-62: Average Daily Traffic Per Lane - 2003 On Principal Arterials
1/ Note that the method used to calculate these data has changed; a weighted average based on length is now used to calculate average daily vehicled per lane.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
HM-63: Functional System Length - 2003 - Miles By Measured Pavement Roughness/Present Serviceability Rating
1/ Some States elect to report International Roughness Index (IRI) for these systems; some report IRI for some sections and PSR for some sections. Some differences from other tables may be noted because these are estimated from sample data.
2/ Data are reported as the IRI in inches per mile. Reference: World Bank Technical Paper Number 46, 1986. Lower IRI represents smoother riding roadways; to obtain a comprehensive assessment of pavement condition, additional measures of pavement distress are needed.
3/ The "Present Serviceability Rating" (PSR) is a subjective, primarily ride-based system adapted from the "AASHO ROAD TESTS" conducted in the late 1950's and early 1960's. Reference: Highway Special Report 61E, 1962. The PSR values range from 0.1 to 5.0; higher PSR values represent smoother riding roadways.
4/ 2002 data used.
HM-64: Functional System Length - 2003 - Miles By Measured Pavement Roughness
1/ Data are reported as the International Roughness Index (IRI) in inches per mile. Reference: World Bank Technical Paper Number 46, 1986. Lower IRI represents smoother riding roadways; to obtain a comprehensive assessment of pavement condition, additional measures of pavement distress are needed.
2/ May include sections entirely on structures and unpaved miles.
3/ Estimated from sample data.
3/ 2002 data used.
HM-71: Urbanized Areas - 2003 - Miles And Daily Vehicle - Miles Of Travel
1/ A "Federal-Aid Urbanized Area" is an area with 50,000 or more persons that at a minimum encompasses the land area delineated as the urbanized area by the Bureau of the Census. Urbanized areas which have been combined with others for reporting purposes are not shown separately. Areas are in sort by population. The Illinois portion of Round Lake Beach-McHenry-Grayslake has been reported with Chicago.
2/ A = Based on either 2000 Census, 2000 Federal-approved adjusted Census, or MPO planning using 2000 Census.
B = Based on either 1990 Census, 1990 Federal-approved adjusted Census, or MPO planning using 1990 Census.
3/ Shaded where data not available.
HM-72: Urbanized Areas - 2003 - Selected Characteristics
1/ A "Federal-Aid Urbanized Area" is an area with 50,000 or more persons that at a minimum encompasses the land area delineated as the urbanized area by the Bureau of the Census. Urbanized areas which have been combined with others for reporting purposes are not shown separately. Areas are in sort by population. The Illinois portion of Round Lake Beach-McHenry-Grayslake has been reported with Chicago.
2/ A = Based on either 2000 Census, 2000 Federal-approved adjusted Census, or MPO planning using 2000 Census.
B = Based on either 1990 Census, 1990 Federal-approved adjusted Census, or MPO planning using 1990 Census.
3/ "DVMT" stands for "Daily Vehicle-Miles of Travel." Shaded where data not available.
4/ Lane-miles estimated by FHWA.
HM-81: State Highway Agency-Owned Public Roads - 2003 - Rural And Urban Miles; Estimated Lane-Miles And Daily Travel
1/ Includes roadways owned by the State highway agency. Excludes roadways owned by State toll, State park and other State agencies.
2/ Statewide totals for miles, lane-miles, and travel are found in tables HM-20, HM-60 and VM-2 (annual VMT), respectively.
3/ May see differences from prior years; starting in 1999, number of lanes is coded for all systems except rural minor collector and rural/urban local, which are assumed to have two lanes.
4/ DVMT (Daily Vehicle-Miles of Travel) is in thousands.
5/ AADT means Annual Average Daily Traffic. ADDT/Lane is a statewide average.
6/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
7/ 2002 data used.
VM-2: Functional System Travel - 2003 - Annual Vehicle-Miles
1/ Travel for all systems are FHWA estimates based on State provided HPMS data.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
VM-3: Federal -Aid Highway Travel - 2003 - Annual Vehicle-Miles
1/ Travel for all systems are FHWA estimates based on State provided HPMS data.
2/ California has been asked to review their 2003 data and may resubmit pending the resolution of review findings.
3/ 2002 data used.
If you have specific questions regarding Mileage and Travel, email us or phone (202) 366-0160.
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