Route Dominance

The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS route dominance event polyline feature class designates which route is considered dominant when two or more signed routes overlap along the same roadway segment. This determination ensures consistency in reporting, mapping, and data analysis for overlapping corridors such as Interstate, U.S., and State routes. Dominance is typically assigned based on route hierarchy (Interstate, U.S., State, then Local), functional classification, and direction of inventory. When multiple concurrent routes exist, the dominant route is coded for inventory and data attribution purposes, while the subordinate routes are tracked as concurrent. This dataset supports system inventory accuracy, reduces duplication, and maintains consistency across route-based reporting and HPMS submissions. It is 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. This content item is a sub-layer of the Road Network - Other authoritative feature layer. Metadata爱达荷州运输部（Idaho Transportation Department，ITD）的《道路与公路网线性参考系统（Linear Referencing System，LRS）HPMS路线主导事件折线要素类》，用于指定当两条及以上已标识路线在同一路段出现重叠时，哪一条路线被认定为主导路线。该判定可为州际公路、美国国道及州道等重叠路段的报告编制、可视化制图与数据分析工作提供一致性保障。路线主导性的分配通常依据路线层级（州际公路、美国国道、州道，最后为地方道路）、功能等级以及资产清查方向确定。当存在多条并行路线时，主导路线将被编码以用于资产清查与数据属性赋值，从属路线则作为并行路线进行记录追踪。本数据集可提升系统资产清查的准确性，减少数据重复，并确保基于路线的报告及公路性能监测系统（Highway Performance Monitoring System，HPMS）提交内容的一致性。作为爱达荷州运输部向美国联邦公路管理局（Federal Highway Administration，FHWA）提交HPMS数据的年度工作组成部分，本数据集每年都会进行审核与更新。本图层为《道路与公路》系统的导出产物，仅包含线性参考系统（LRS）中的有效记录。本内容项属于“道路网络-其他权威要素图层”的子图层。元数据