Adopt-A-Highway (AAH) All Highways

It is produced by the AAH application-to-feature pipeline, which ingests each district's GIS join query exports (D##_qry_GIS_Join_EN1 and _WS1), drops personally identifiable applicant contact fields, and generates line geometry by linear referencing each site's begin and end postmiles along the State Highway Network centerline (SHN_lines) using the Caltrans LRS measureToGeometry REST operation.

Each travel direction on a divided highway is derived from the source direction and placed as a separate feature on its own alignment; directions are never merged. The map status class (Status_Pub, aliased 'Status') is derived by the pipeline's reclassification step from the source adoption status, with 'Vacant (NSR)' promoted to 'Available Pending Site Review'. The published schema is a curated subset for public display: feature key (id_AHH_Join), district, county, route, begin/end postmile and postmile span (pm_span_mi), direction, city, begin/end postmile landmark descriptions, location type, maintenance region, and the derived public status (Status_Pub, aliased 'Status').