HPMS Passing Sight

The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS passing sight event polyline feature class identifies the proportion of each sample section where adequate sight distance exists for safe vehicle passing in the inventory direction. This measure reflects geometric and topographic roadway characteristics that affect driver visibility and passing opportunity. Values represent the percentage of total section length that meets or exceeds FHWA-defined minimum passing sight-distance criteria for the prevailing design speed. The dataset is used in safety evaluations, highway investment modeling, and roadway performance analyses. It is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA). 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爱达荷州交通运输部（Idaho Transportation Department, ITD）道路与公路路网线性参考系统（Linear Referencing System, LRS）下的高速公路性能监测系统（Highway Performance Monitoring System, HPMS）会车视距事件折线要素类，用于识别各样本路段在通行方向上具备安全车辆会车所需充足视距的路段占比。该指标可反映影响驾驶员视野与会车机会的道路几何与地形特征，其数值代表路段总长度中，符合或超过美国联邦公路管理局（Federal Highway Administration, FHWA）针对现行设计速度所规定的最低会车视距标准的比例。本数据集可应用于安全评估、公路投资建模及道路性能分析工作。作为ITD向联邦公路管理局提交的高速公路性能监测系统子项，该数据每年更新一次。此图层为《道路与公路》模块的导出产物，仅包含线性参考系统中的有效记录，即当前的“工作”记录。如需获取静态发布的官方数据，请访问以下地址存储的记录：https://www.fhwa.dot.gov/policyinformation/hpms.cfm。本内容项为高速公路性能监测系统权威要素图层的子图层。元数据