Delaware state line by 1934. The Cecil County section of the highway was widened again with a pair of shoulders in 1937 and 1938. The U.S. Highway was relocated to its present alignment through Aberdeen to eliminate a pair of crossings of the Pennsylvania Railroad between 1930 and 1933; the old highway south of the railroad tracks became an extension of MD 22. However, the very high levels of traffic due to being the main highway between Baltimore and Philadelphia led to calls for the highway to be expanded to in width along its entire length by 1934. Rather than widen the existing road further, the Maryland State Roads Commission decided to build a new Philadelphia Road, later known as Pulaski Highway, as a divided highway on a new alignment between Baltimore and Aberdeen and to expand the newly relocated highway through Aberdeen to Havre de Grace to a four-lane divided highway. The new US 40 was started in 1935 and completed in 1938. The original Philadelphia Road between Baltimore and Aberdeen became the first section of MD 7. The next sections of the old highway to be bypassed were in Havre de Grace and Perryville when the Thomas J. Hatem Memorial Bridge and its approaches opened in August 1940, replacing the double-decked converted railroad bridge. The portions of the old highway on either side of the river became additional sections of MD 7. Construction on the new Philadelphia Road in Cecil County began in 1938 and was completed in 1941. Transfer of US 40 to its new alignment resulted in the addition of two more sections of MD 7 from west of Charlestown through North East to west of Elkton and through Elkton. Despite the bypassing of the original Philadelphia Road, improvements continued to be made to MD 7. The state highway was widened with dual shoulders from the Baltimore city limit to Rossville in 1938. MD 7 was widened through Havre de Grace in 1953 and through Elkton in 1954. The highway was relocated and became a divided highway on both sides of its intersection with MD 543 in Riverside concurrent with the construction of MD 543's interchange with I-95 in 1989. MD 7's roundabout at Holly Oak Circle in Riverside was installed in 2000. Several portions of the state highway have been transferred to local maintenance. The portion of MD 7 to the south of US 40