Oregon - two official routes - Oregon Coast and Columbia River Gorge
state bicycling map has traffic volume and shoulder width information
Oregon Coast Bike Route essentially duplicates Adventure Cycling Pacific Coast Route
Possible east-west routes are difficult due to the high traffic on roads from the Pacific Coast
Possible north-south routes in Eastern Oregon follow OR-37, 205, 78 and US-395, 95
US-20 east to west
US-26 east to west
western Oregon is laced with good secondary roads, so cross-state connections
can easily be made with state/federal highways in eastern Oregon and good
north-south routes can be developed along the I-5 corridor
Adventure Cycling TransAm, Pacific Coast, and Lewis & Clark Trail routes (not on map)
Pennsylvania
State routes A, G, L, S, Y, Z, E
Adventure Cycling Northern Tier route (not on map)
Rhode Island Signed Bike Routes:
Scituate Avenue Rt. 5 in Cranston to Scituate Reservoir
Route 2 Rt. 102 in N. Kingstown to Rt. 138 in S. Kingstown
Route 3 Division Road in West Greenwich to Bakers Pine Road in Hopkinton
Route 102 Rt. 14/102 in Foster to Breakneck Hill Road in West Greenwich
Route 1A North Kingstown Town Hall to Sprague
Park in Narragansett
Route 14 Pippin Orchard Road in Cranston to Rt. 116 in  Scituate
Pippin Orchard Road Rt. 14 in Cranston to Rt. 12 in Cranston
Route 117 Route 102 to Coventry Greenway
Route 91 Alton Bradford Road Route 112 to Bradford Fishing Area
Route 120 Nate Whipple Highway Mendon Road to the MA State Line
Bike Lanes:
Roadway From/To
Narragansett Blvd/Allens Avenue Public St. to Ocean Ave.
Promenade St. Providence Place Mall to Dean St.
Kinsley Avenue Eagle St. to Providence Place Mall
South Carolina
no published guide but online maps are available
www.sctrails.net/trails/ALLTRAILS/Bikeguide/biking.html
Adventure Cycling Atlantic Coast route (not on map)
South Dakota - NO DESIGNATED CROSS STATE ROUTES
State has shoulder width/rumble strip and traffic density maps
Except I-90 and I-29 and a few stretches of US-12, 281, 14, and 16 
and SD-79, 34, 37, 50, and 34, traffic densities are low throughout the state.
Many north-sout and east-west routes are possible.
Adventure Cycling Lewis & Clark Trail route (not on map)
Tennessee - NO DESIGNATED CROSS-STATE ROUTES
Route Description of possible routes based on suitability map
US-11W Bristol to Knoxville
US-70 Knoxville to Memphis (conditions and shoulder width vary)
TN-56 Gainsboro to Baxter
TN-85 Hilham to Gainesboro
TN -136 Timothy to Hilham
TN-135 Cookeville to TN-111
TN-111 Sparta to TN-284
TN-284 TN-111 to Fall Creek Falls S.P.
County roads and segments of US-11E/321 From Elizabethon to Gatlinburg
US 231 Murfreesboro to Shelbyville
County roads and segments of TN-54, 114, 202, 69, 128 rom Paris to Pickwick Landing SP
County roads and segments of TN-104, 88, 19, 59, 216, 21, 22, 181 along western state line from Martin to Memphis
Adventure CyclingGreat Rivers South route (not on map)