Interstate 695 has existed in Washington D.C. dating back to 1960s, but it has never to my knowledge been posted until its recent realignment. I’m not sure if it is posted much outside of the 11th Street Bridge project yet. However, Google Maps now has it up.
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Unfortunately, Google has not marked it very accurately — depending on what level of zoom you look at the map, it is either marked along the Southwest Freeway or the portion of the Southeast Freeway past the 11th Street Bridge. The 11th Street Bridge is still marked as I-295 which is no longer correct.
This embedded map is subject to change (as seen with some Northern Virginia parkways) so the accuracy of the post is subject to change. Hopefully soon.
Signs: Shields Up!