The highway was widened by  from the east end of Capitol Heights to Addison Road in Seat Pleasant in 1948; that same year, the highway was widened to  at the US 301 junction to provide extra capacity at that signalized intersection. MD 214 was relocated to its present alignment between Pike Ridge Road and MD 253 in 1949.
In 1948, the highway was widened from its eastern end at Capitol Heights to Addison Road in Seat Pleasant; concurrently, it was expanded at the US 301 junction with US 301 for improved traffic flow. MD 214 was relocated between Pike Ridge Road and MD 253 in 1949.