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