Status list for Named Routes and their Unique Shields: A Picture Challenge on AARoads forum. Alphabetized by significant words (i.e. road type is ignored if listed before significant words).

32nd Division Memorial Highway (Wisconsin) (A)
Route des Baleins
Bert T. Combs Mountain Parkway
Cabot Trail
Capitol Loop (Lansing)
Creole Nature Trail
Crosstown Expressway (Tampa)
Crowsnest Route
Dallas North Tollway
Daniel Boone Heritage Trail
Door County Coastal Byway
E-470 (Denver)
Everett Turnpike
Florida Cracker Trail
Inner Loop (Rochester, NY)
John F. Kennedy Highway (Maryland)
New England Thruway
Golden Isles Parkway
Great River Road
Lake Superior Circle Tour
Lewis and Clark Trail
Lincoln Highway
Lincoln Heritage Trail
Maine Turnpike
Merritt Parkway
Northern State Parkway (New York)
Ohio Turnpike
Olympic Scenic Byway
Ronald Reagan Trail (Illinois)
Route 66
Chemin du Roy (Quebec)
Sam Houston Tollway
Sawgrass Expressway
Sea to Sky Highway (BC 99)
South Georgia Parkway
Spaulding Turnpike
St. Patrick's Trail (Northern Ireland)
Trans-Canada Highway
Trossachs Trail
TT Mountain Course
Wantagh State Parkway
Yellowhead Route

Notes

A. Unique variation of standard state shield.