Michigan Department of TransportationR&H ORE file with Facility Type, Functional System, Through Lanes, Urban Code, National Highway System (NHS), and Surface Type field data. Definitions for surface type (item 49) are available at Highway Performance Monitoring System (HPMS) Field Manual - Policy Federal Highway Administration (dot.gov)ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a77823b832514252a582c90ad4956249_0engState of Michigan Open Data PortalPublicMIRE Surface Type Coverage [Michigan]Web servicesMichiganLast Modified: 2022-07-27