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Maryland Manual on Uniform Traffic Control Devices signage code: I-12(2)
Maryland State Highway Administration
<a rel="nofollow" class="external free" href="https://apps.roads.maryland.gov/businesswithsha/bizStdsSpecs/desManualStdPub/publicationsonline/oots/SignBook/pdf/I-12(2).pdf">https://apps.roads.maryland.gov/businesswithsha/bizStdsSpecs/desManualStdPub/publicationsonline/oots/SignBook/pdf/I-12(2).pdf</a>