Keywords: US 13 Business (MD).svg A business U S highway route marker as used in the state of Maryland modified from Image Maryland US business route template svg which follows the specification at http //www marylandroads com/businesswithsha/bizStdsSpecs/desManualStdPub/publicationsonline/oots/pdf/M1-4 1 pdf own work Maryland business U S highway route markers 013 2006-11-03 own assumed Jeff02 |