DisappearingAmerica
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Breakdown of Signs by State
Neon Signs
Ghost Signs
Drive In Theaters
Miscellaneous Signs
Indiana
Maryland
New Jersey
Delaware
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Pennsylvania
Virginia
Washington DC
South Carolina
North Carolina
West Virginia
Hillside Motel
Cadillac Motel
Brandywine, MD
So apparently the sign was updated at some point to remove the strip between Cadillac and motel and to add the arrow.