MD 416 was expanded to a divided highway in the early 1960s , shortly before MD 416 became part of MD 4 .
Southern Maryland Boulevard was constructed in the late 1920s and was designated MD 416 .
MD 416 was expanded to a divided highway in the early 1960s , shortly before MD 416 became part of MD 416   .
Southern Maryland Boulevard was constructed in the late 1920s and was designated MD 416 .