Maryland Road System 1925
Detail from "Map of Maryland Showing State Road System" 1925

blue= macadam & vitrified brick- State Road
red= concrete, bituminous concrete & asphalt- State Road
green= gravel & shell- State Road
yellow= macadam- State Aid Road
yellow with horizontal lines= concrete- State Aid Road
green with horizontal lines= gravel & shell- State Aid Road
white= State Road System Proposed