{"@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 length by measured pavement roughness using the IRI (International Roughness Index) by functional class for the 50 states, DC, and PR from the Highway Statistics Series table HM-64.  Note: Missing 2010 and 2021,", "distribution": [{"@type": "dcat:Distribution", "describedBy": "https://data.transportation.gov/api/views/26bt-cq5y/columns.json", "describedByType": "application/json", "downloadURL": "https://data.transportation.gov/api/views/26bt-cq5y/rows.json?accessType=DOWNLOAD", "mediaType": "application/json"}, {"@type": "dcat:Distribution", "describedBy": "https://data.transportation.gov/api/views/26bt-cq5y/columns.rdf", "describedByType": "application/rdf+xml", "downloadURL": "https://data.transportation.gov/api/views/26bt-cq5y/rows.rdf?accessType=DOWNLOAD", "mediaType": "application/rdf+xml"}, {"@type": "dcat:Distribution", "describedBy": "https://data.transportation.gov/api/views/26bt-cq5y/columns.xml", "describedByType": "application/xml", "downloadURL": "https://data.transportation.gov/api/views/26bt-cq5y/rows.xml?accessType=DOWNLOAD", "mediaType": "application/xml"}, {"@type": "dcat:Distribution", "downloadURL": "https://data.transportation.gov/api/views/26bt-cq5y/rows.csv?accessType=DOWNLOAD", "mediaType": "text/csv"}], "identifier": "https://data.transportation.gov/api/views/26bt-cq5y", "issued": "2025-07-29", "keyword": ["functional classification", "highway statistics", "hppi", "iri"], "landingPage": "https://data.transportation.gov/d/26bt-cq5y", "language": ["en-US"], "license": "https://www.usa.gov/government-works", "modified": "2026-03-26", "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": "2000/2024", "theme": ["Transportation"], "title": "Road Length by Measured Pavement Roughness, 2000-2024 (HM-64)"}