{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["021:15"], "contactPoint": {"@type": "vcard:Contact", "fn": "Office of Highway Policy Information", "hasEmail": "mailto:PolicyInfoFeedback@dot.gov"}, "dataQuality": true, "description": "Annual road miles by functional system (National Highway System, other Federal-aid highways, and non-Federal-aid highways) and state for the 50 states, DC, and PR from the Highway Statistics Series table HM-15. Note: Missing 2009 and 2021.", "distribution": [{"@type": "dcat:Distribution", "describedBy": "https://data.transportation.gov/api/views/xdi8-z7ty/columns.json", "describedByType": "application/json", "downloadURL": "https://data.transportation.gov/api/views/xdi8-z7ty/rows.json?accessType=DOWNLOAD", "mediaType": "application/json"}, {"@type": "dcat:Distribution", "describedBy": "https://data.transportation.gov/api/views/xdi8-z7ty/columns.rdf", "describedByType": "application/rdf+xml", "downloadURL": "https://data.transportation.gov/api/views/xdi8-z7ty/rows.rdf?accessType=DOWNLOAD", "mediaType": "application/rdf+xml"}, {"@type": "dcat:Distribution", "describedBy": "https://data.transportation.gov/api/views/xdi8-z7ty/columns.xml", "describedByType": "application/xml", "downloadURL": "https://data.transportation.gov/api/views/xdi8-z7ty/rows.xml?accessType=DOWNLOAD", "mediaType": "application/xml"}, {"@type": "dcat:Distribution", "downloadURL": "https://data.transportation.gov/api/views/xdi8-z7ty/rows.csv?accessType=DOWNLOAD", "mediaType": "text/csv"}], "identifier": "https://data.transportation.gov/api/views/xdi8-z7ty", "issued": "2026-02-02", "keyword": ["functional system", "highway statistics", "hppi", "roadways"], "landingPage": "https://data.transportation.gov/d/xdi8-z7ty", "language": ["en-US"], "license": "https://www.usa.gov/government-works", "modified": "2026-04-23", "primaryITInvestmentUII": "021-099281808", "programCode": ["021:009"], "publisher": {"@type": "org:Organization", "name": "Federal Highway Administration"}, "systemOfRecords": "https://www.govinfo.gov/content/pkg/FR-2006-05-03/pdf/E6-6510.pdf", "temporal": "2000-01-01/2024-12-31", "theme": ["Transportation"], "title": "Federal-aid Highway System Length by Functional System, 2000-2024 (HM-15)"}