{ "culture": "en-US", "name": "", "guid": "", "catalogPath": "", "snippet": "This dataset contains the Roads and Highways Road Network Linear Referencing System (LRS) HPMS terrain type event polyline feature class which identifies the predominant terrain type along Idaho\u2019s public roadway segments as reported through the Highway Performance Monitoring System (HPMS). The data supports roadway design, performance modeling, and geometric evaluation.", "description": "
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. <\/SPAN><\/P> 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\u2019s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA). <\/SPAN><\/P>