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An arc layer for visual representation of the state road system where each arc/record is split at each state maintained road intersection. This is a digital file of the North Carolina Department of Transportation's Linear Referencing System that represents the routes and attributes of the NCDOT state road system. The state road system is comprised of Interstate, US, NC, Secondary Routes and Ramps. This layer also includes some non-state maintained and projected roads that are required for reporting purposes. This layer also contains some additional routes to meet the Federal Highway Administration's (FHWA) data requirements for the Highway Performance Monitoring System (HPMS). HPMS is a national level highway information system that includes data on the extent, condition, performance, use, and operating characteristics of the Nation's highways. States are required to submit an HPMS report to FHWA annually. The additional routes include: Projected Routes - generalized locations of projected routes that will become part of the National Highway System (NHS) when they are built. Non-state maintained roads - generalized locations of roads that are owned by local, state and federal entities. Only non-state maintained roads that are eligible for federal aid are included. Currently there is no connectivity enforced between the state-maintained roads and the non-state maintained roads. Data quality is tracked using the revision document fields (REVDOC_TYP_CD and REVDOC_NUM). Legacy data are coded as not verified. These data are updated on an ongoing basis to improve data quality and the revision document fields are updated accordingly. As new data are added the geometry and spatial location are verified with the most current information available. |