I clinched MD911 today, and did not notice any signs in either direction. Upon doing some GSV research, I made the following observations:
1. End MD911 sign/assembly at the northern terminus was removed sometime between October 2008 and April 2012.
2. End MD911 sign/assembly at the southern terminus was removed sometime between July 2017 and October 2018.
3. There is currently no signage from either MD28, MD355, or MD586 (or even Wootton Pkwy for that matter) recognizing MD911.
4. The lone MD911 reassurance marker (southbound at the northern terminus) was removed between October 2008 and April 2012.
MD911 is still listed in the latest edition of the Highway Location Reference, so it still exists according to MDOT SHA. However, I would definitely conclude that it is unsigned, which makes sense given its length.