HPMS Last Overlay

The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS last overlay event polyline feature class identifies the compacted depth of the most recent pavement layer placed over an existing roadway surface during an overlay or resurfacing project. This value reflects the thickness of new asphalt or Portland Cement Concrete (PCC) material added to restore structural integrity, ride quality, and service life. Thickness data is derived from project construction documentation, pavement design plans, and ITD’s pavement management systems. For asphalt overlays, thickness represents the compacted depth of new hot mix asphalt placed on the existing pavement. For concrete overlays, it represents the finished depth of the new concrete layer above the previous surface. This dataset is used by engineers, pavement managers, and analysts to evaluate the structural adequacy of resurfaced pavements, estimate remaining service life, and support performance modeling. It also assists in determining maintenance timing, comparing design versus constructed conditions, and verifying consistency with HPMS data submissions to the Federal Highway Administration (FHWA). Updates occur annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal cycle using the most current pavement project and inventory information. This layer is an export from Roads and Highways that represents only the active records within the LRS. These are current “working” records. For the static, published data, please see the records stored at: https://www.fhwa.dot.gov/policyinformation/hpms.cfm This content item is a sub-layer of the Highway Performance Monitoring System (HPMS) authoritative feature layer. Metadata爱达荷州运输部（Idaho Transportation Department, ITD）道路与公路网线性参照系统（Linear Referencing System, LRS）公路性能监测系统（Highway Performance Monitoring System, HPMS）最新覆盖事件折线要素类，用于标识道路覆盖或重铺工程中，铺筑于现有路面表层之上的最新路面层的压实厚度。该数值反映了为恢复路面结构完整性、行驶品质与服务寿命所添加的新型沥青或波特兰水泥混凝土（Portland Cement Concrete, PCC）材料的厚度。厚度数据来源于工程施工文档、路面设计方案以及ITD的路面管理系统。对于沥青覆盖工程，该厚度指铺筑于现有路面之上的新型热拌沥青混合料的压实厚度；对于混凝土覆盖工程，该厚度指铺筑于原有路面表层之上的新型混凝土层的完工厚度。本数据集可供工程师、路面管理人员与分析师使用，用于评估重铺路面的结构适用性、预估剩余服务寿命，并为性能建模提供支撑。其还可辅助确定养护时机、对比设计与施工状态，并验证向美国联邦公路管理局（Federal Highway Administration, FHWA）提交的HPMS数据的一致性。每年作为ITD公路性能监测系统（HPMS）提交周期的一部分，结合最新路面工程与库存信息对本数据集进行更新。该要素类为《道路与公路》系统导出的图层，仅包含线性参照系统（LRS）中的有效记录，即当前的“工作中”记录。如需获取静态发布数据，请参阅存储于以下网址的记录：https://www.fhwa.dot.gov/policyinformation/hpms.cfm 本内容项为公路性能监测系统（HPMS）权威要素类的子图层。元数据