 MD 151 is a four- to six-lane divided highway that connects the communities of Edgemere and Dundalk on the Patapsco River Neck peninsula of southeastern Baltimore County with industrial areas in Sparrows Point and East Baltimore.MD 151 was originally constructed in the early 1920s from Sparrows Point to Edgemere.The highway was connected to Baltimore by the Baltimore County portion of MD 20, a number also assigned to the highway from Rock Hall to Chestertown in Kent County.