 A freeway section of MD 177 was constructed between MD 3 in Glen Burnie and MD 2 in the mid-1960s; the freeway was renumbered MD 100 when that highway was completed from Pasadena to Jacobsville in the early 1970s.Congestion east of MD 100 led to the addition of a reversible lane in 1999.MD 177 begins at an intersection with MD 2 (Governor Ritchie Highway) in Pasadena just north of MD 2's interchange with MD 100 (Paul T. Pitcher Memorial Highway).