King CountyFor more information about this layer please see the GIS Data Catalog . King County Roads Division changeable message signs, also known as variable or electronic message signs, used to warn travelers about special events, traffic congestion, roadwork, accidents or speed limits, as well as other changing roadway conditions. Most of these signs are temporarily placed, some are permanent.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/b150e7809cd94657b7704c5651871482_0engKing County GIS Open DataPublicChangeable Message Sign [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2026-01-06