Maryland Route 140 partially coincident with Maryland Route 97
History
Until 1979, MD 140  was US 140. Before US 140 was deleted, it was where MD 140 is today. At the divergence of MD 140 and MD 97 northwest of Westminster, the two routes were swapped after the deletion of the U.S. route; MD 97 now follows US 140's old route to Pennsylvania, while MD 140 follows MD 97's original route to Taneytown and US 15. As a result, MD 140 follows the bypass of the original MD 32 between Westminster and Taneytown that was first designated as part of MD 97.
In 1977, plans were made for US 140 to be decommissioned, with the route to be replaced by MD 140 between Baltimore and Westminster, MD 97 between Westminster and the Pennsylvania state line, and PA 97 between the Maryland state line and Gettysburg. This proposal was made in order to eliminate short routes from the U.S. Highway System. The American Association of State Highway and Transportation Officials approved the removal of the US 140 designation on October 28, 1977. At one point, the section between MD 30 in Reisterstown and Westminster was to become a part of MD 9, which would continue northwest to Emmitsburg; MD 140 was to be designated between Baltimore and Reisterstown. US 140 was decommissioned on January 1, 1979 and became MD 140 between Baltimore and Westminster; MD 140 also ran along the former alignment of MD 97 between Westminster and Emmitsburg; MD 97 replaced US 140 between Westminster and the Pennsylvania border.
partially overlapping with partially intersecting with partially sharing with partially matching with partially aligning with