sentences:  MD 21 was constructed in the mid-1920s to provide a modern road connection to Tolchester Beach, then a major beach resort on the Chesapeake Bay.The highway's western terminus was rolled back to MD 445 in the early 1990s.MD 21 begins at Tolchester Beach Road's intersection with the northern end of MD 445 (Tolchester Road), the north leg of the intersection is county-maintained Bay Shore Road, and Tolchester Beach Road continues west as a county road to the eponymous beach community and its marina.