The parkway stretch of MD 337 is maintained by the National Park Service (NPS) instead of the Maryland State Highway Administration (MDSHA).

The highway was moved to its present alignment to make way for the construction of Andrews Air Force Base during World War II.

The Allentown Road portion of MD 337 was expanded to a multi-lane divided highway in the late 1970s and early 1980s.

MD 337 heads northeast as a four-lane divided highway but becomes a four-lane road with a center left-turn lane as the highway begins to follow the northern edge of the Andrews Air Force Base military reservation.

[1][2] MD 337 meets the southern end of Forestville Road at an intersection that includes a ramp to northbound I-95/I-495.

The highway reduces to two lanes and then becomes one-way eastbound shortly before it merges with the federally maintained Suitland Parkway.

MD 337 becomes state-maintained again at its trumpet interchange with the access road to the north gate of Andrews Air Force Base.

[1][2] MD 337 is part of the main National Highway System from Suitland Road to the ramp to northbound I-95/I-495 and from the north entrance to Andrews Air Force Base to MD 4; the adjacent portion of Suitland Parkway is also part of the main National Highway System.

[10][11] MD 337 east of Auth Road was relocated for the construction of Andrews Air Force Base during World War II.

The highway administration will coordinate with NPS to limit adverse impacts to the Suitland Parkway and will work around height restrictions due to the runways at the air force base.