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NHS Routes are geospatial data maintained by the Seattle Department of Transportation, displaying the city's National Highway System network. The dataset is updated daily by the City of Seattle and was last refreshed on March 22, 2026. It is available in multiple formats including CSV, JSON, and KML for analysis and mapping.
Data is provided in multiple formats; the GeoPackage+SQLite3 and KML formats suggest specialized GIS tools may be beneficial for full utilization.