Washington State Department of TransportationPolygons represent the Regional Transportation Planning Organizations (RTPOs) planning area boundaries, Metropolitan Planning Organizations (MPO's) Metropolitan Planning Area (MPA) boundaries, and MPO MPAs that are designated as Transportation Management Areas (TMA's). MPOs are responsible for transportation planning within the MPA. RTPOs are responsible for growth management compliance within their planning areas and the development and adoption of regional transportation plans.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/6bbf081888e34aae84dc9bb608e152bc_5engState of Washington Geospatial Open Data PortalPublicWSDOT - Transportation Management Area [Washington (State)]Web servicesWashington (State)Last Modified: 2025-10-07