When the Maryland State Roads Commission laid out a proposed state road system in 1909, two sections of the Philadelphia Road were included: from the eastern city limit of Baltimore, then at Elwood Avenue, east to Rossville in Baltimore County, and from Perryville to Elkton. The highway was paved as an wide tarred macadam road from Elwood Avenue to Herring Run in 1910. The remainder of the road from Herring Run to Rossville was completed in concrete by 1921. In Cecil County, the Philadelphia Road was paved with a wide macadam surface from the eastern town limit of North East to the western town limit of Elkton in 1913. The highway was paved in concrete from Perryville to Principio Creek and in macadam from there through Charlestown in 1914. The state road was paved in macadam from Charlestown to North East, including Cecil Avenue within the latter, in 1915. The section of the state road through Charlestown, which is now MD 267, was bypassed with a concrete road that remained on the north side of the Pennsylvania Railroad by 1921.