From Wazeopedia

Functional classification maps by state[edit | edit source]

Alabama ALDOT
Alaska Alaska DOT
Arizona ADOT
Arkansas [[ > ArcGIS Viewer]] AHTD FC Overlay for ArcGIS - To use the overlay, click on the "Modify Map" in the upper right corner of ArcGIS. On the left side an "Add+" tab will pop up. Click on it and select "Add Layer from Web" and paste in this URL:
California Caltrans Earth Caltrans Caltrans Earth is down, for the foreseeable future. Please use the Static maps. :(
Colorado CDOT MapView
Connecticut Connecticut DOT
Delaware DelDOT
District of Columbia DDOT
Florida FDOT's Downloadable GIS files See Southeast Region Wiki Please DO NOT use the FDOT Enterprise IMAP for doing Functional Classification Changes. It is out of date.
Georgia Atlanta Metro (proposed) Statewide FC maps under review by DOT; not available online until Sep 2014(?). See forum for details.
Hawaii Hawaii DOT The updated HDOT GIS Website requires the Adobe SVG Viewer.
Idaho ArcGIS Webmap
Illinois Getting Around Illinois Illinois DOT
Indiana INDOT FC Layer
Iowa IowaDOT
Kansas KDOT
Kentucky KYTC Functional Class Kentucky Transportation Cabinet
Louisiana LaDOTD Interactive Online Map LaDOTD
Maine MaineDOT MaineDOT
Maryland MD SHA via nzahn1 MD SHA Interactive Maps transformed from MD SHA data to Google Earth(.kml) by nzahn1
Massachusetts Road Inventory Map massDOT Select Federal Functional Classification from pulldown list on Road Inventory Map.
Michigan MDOT PR Finder MDOT
Minnesota MnDOT Basemap MnDOT
Mississippi MDOT
Missouri MoDOT
Montana ArcGIS Webmap MDT

Statewide PDF

Nebraska Nebraska Department of Roads
Nevada Nevada DOT
New Hampshire New Hampshire DOT
New Jersey NJDOT
New York NY State DOT
North Carolina NCDOT
North Dakota NDDOT
Ohio TIMS Ohio DOT
Oklahoma ODOT
Pennsylvania PennDOT
Rhode Island RI Division of Planning
South Carolina SCDOT GIS/Mapping
South Dakota SDDOT
Tennessee TDOT
Texas TxDOT Statewide Planning Map
Vermont VTrans
Virginia VDOT
Washington WSDOT
West Virginia WV DOT
Wisconsin WisDOT
Wyoming WYDOT Appears on U.S. Forest Service - WYDOT Liaison Program

Other urban FC maps appear on various WY city government pages

SteveInArk can be reached by private message.