You don't see warnings like this in SC.
McMillin Bridge, the only full-height concrete truss bridge in the US. (There are also two concrete pony truss bridges in the US.) Completed in 1935, but now its fate isn't clear. No one wants to pay for its maintenance anymore.
Sidewalks integrated into the trusses on both sides.
The road surface is asphalt, but the sidewalks have wood decking. In the Pacific NW.