HPMS Terrain Type

The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS terrain type event polyline feature class classifies roadway segments according to the general topography of the surrounding landscape, which influences vehicle speed, design standards, and operational characteristics. Terrain type reflects the overall slope and grade of the roadway corridor, not isolated features. This dataset helps determine appropriate design criteria, such as horizontal and vertical alignment, and is used in performance modeling and cost estimation. Data are reviewed and 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）的《道路与公路网络线性参考系统（Linear Referencing System，LRS）HPMS地形类型事件折线要素类》，依据周边景观的整体地形对道路路段进行分类，而地形特征会影响车辆行驶速度、设计标准及运营特性。地形类型反映的是道路走廊的整体坡度与纵坡，而非孤立的局部地形特征。该数据集可用于确定合适的设计准则，例如平纵线形，并可应用于性能建模与成本估算工作。作为ITD向美国联邦公路管理局（Federal Highway Administration，FHWA）提交公路性能监测系统（Highway Performance Monitoring System，HPMS）相关材料的一部分，该数据集每年都会进行审核与更新。本图层为《道路与公路》模块的导出产物，仅包含线性参考系统（LRS）中的有效记录，即当前的“工作”记录。如需获取静态的已发布数据，请查阅存储于以下网址的记录：https://www.fhwa.dot.gov/policyinformation/hpms.cfm。本内容项属于公路性能监测系统（HPMS）权威要素图层的子图层。元数据