Road Length by Measured Pavement Roughness, 2000-2024 (HM-64)

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...本数据集为覆盖美国50个州、哥伦比亚特区（District of Columbia，DC）及波多黎各（Puerto Rico，PR）的年度道路里程数据，按道路功能等级分类，其数据基于国际平整度指数（International Roughness Index，IRI）实测路面平整度结果计算得出，数据源自公路领域[原文省略后续内容]。