This is Tokorozawa Rikkyo, a bridge that crosses over the Seibu Ikebukuro Line railroad.
There used to be a railroad crossing right around the same place until this bridge was built in the early 70s. Many cars use this bridge that leads on to the Tokorozawa Rikkyo North intersection.
I'm not too sure what that sign on the bridge means...maybe that the bridge is 2.2 meters high? Does that sound right?
Click below for more lovely photos of bridges around the world!