Baltimore Metro SubwayLink Logo for Signage (Blue) as described in the Maryland Manual on Traffic Control Devices (MUTCD); sign number I-7(1); reference sections 2D.48, 2E.55.
Maryland State Highway Administration
<a rel="nofollow" class="external free" href="https://apps.roads.maryland.gov/businesswithsha/bizStdsSpecs/desManualStdPub/publicationsonline/oots/SignBook/pdf/I-7(1).pdf">https://apps.roads.maryland.gov/businesswithsha/bizStdsSpecs/desManualStdPub/publicationsonline/oots/SignBook/pdf/I-7(1).pdf</a>