Maryland Route 5 partially coincident with U.S. Route 301 in Maryland
Maryland Route 5 (MD 5) is a 74.34-mile (119.64 km) long state highway that runs north–south in the U.S. state of Maryland. The highway runs from  Point Lookout in St. Mary's County north to the Washington, D.C. border in Suitland, Prince George's County. MD 5 begins as two-lane undivided Point Lookout Road which runs from Point Lookout to an intersection with MD 235 in the northern part of St. Mary's County.  Point Lookout Road passes through rural areas as well as the county seat of Leonardtown. After the MD 235 intersection, the route becomes four-lane divided Three Notch Road and continues into Charles County, where it becomes Leonardtown Road. Here, the route bypasses Hughesville and continues north toward the Waldorf area, which it bypasses to the east on Mattawoman Beantown Road. The route merges onto U.S. Route 301 (US 301, Crain Highway) and enters Prince George's County, splitting from US 301 at an interchange in Brandywine. From here, MD 5 continues north on Branch Avenue, running through suburban areas, before becoming a freeway as it passes Andrews Air Force Base and has an interchange with Interstate 95 (I-95)/I-495 (Capital Beltway). Past the Capital Beltway, the route runs through suburban areas of Hillcrest Heights and Suitland before reaching the Washington, D.C. border, where Branch Avenue SE continues, crossing Pennsylvania Avenue SE and eventually terminating at Randle Circle.
MD 5 was designated in 1927 to run from Point Lookout to the Washington, D.C. border in Suitland. The route was realigned to follow Naylor Road to the Washington, D.C. line in 1939, while MD 637 was designated along the portion of Branch Avenue leading to the border. Between 1939 and 1949, the route continued into Washington, D.C. as District of Columbia Route 5 (DC 5), which followed Naylor Road SE, Good Hope Road SE, 11th Street SE, and DC 4 (Pennsylvania Avenue) to US 1 and US 240 near the White House. MD 5 was realigned to head to the Washington, D.C. border along Branch Avenue in 1950. During the course of the 1950s and 1960s, most of MD 5 between the MD 235 intersection and the Washington, D.C. border was widened into a divided highway. In 1993, the route bypassed Leonardtown; the original alignment was designated MD 5 Business (MD 5 Bus.) before it was decommissioned in 2012. In 1997, MD 5 was realigned to bypass Waldorf to the east along what had been designated as MD 205 in 1989. The former alignment through Waldorf followed what is now MD 5 Bus. and US 301. In Prince George's County, multiple interchanges were built along MD 5 between MD 223 and the Capital Beltway in the 1990s and early 2000s. In 2007, a four-lane, divided bypass of Hughesville was completed, alleviating the traffic bottleneck within that town at the intersection of MD 231. The former alignment through Hughesville became MD 5 Bus. The portion of MD 5 between US 301 and the Capital Beltway is slated to be upgraded to a full freeway, with an interchange at MD 373 (Accokeek Road)/Brandywine Road completed and the remainder of the freeway upgrade still in the planning stages.Charles County
MD 5 crosses into Charles County, where it continues north on Leonardtown Road through areas of rural residences. The route reaches Hughesville, where MD 5 bypasses the community to the east on a limited-access highway and MD 5 Bus. (MD 625) continues to the north through Hughesville on Old Leonardtown Road. The bypass heads through wooded areas before coming to a dumbbell interchange with MD 231 (Prince Frederick Road) that features roundabouts where the ramps meet MD 231. Past MD 231, the bypass continues through woodland before intersecting MD 5 Business again. From here, MD 5 heads northwest through a mix of woods and farms with some residences and businesses. The route turns to the west and passes through Bryantown, where it intersects Olivers Shop Road/Bryantown Road intersection.The road turns to the northwest past Bryantown and heads through wooded areas, passing through Zekiah Swamp.  MD 5 comes to an intersection with MD 488 (La Plata Road) and turns north again, heading through a mix of woods, farms, and residences. The route heads through wooded residential neighborhoods before it heads back into farmland. The route reaches the eastern edge of the planned community of St. Charles, where it comes to an intersection where St. Charles Parkway heads south into St. Charles, MD 5 Business heads to the west on Leonardtown Road, and MD 5 turns north onto Mattawoman Beantown Road.MD 5 follows Mattawoman Beantown Road, a four-lane divided highway that bypasses the center of Waldorf to the east. The route intersects Poplar Hill Road, which leads to the house of Dr. Samuel A. Mudd. Mattawoman Beantown Road carries MD 5 north through farm fields before heading into woodland, passing west of a park and ride lot serving MTA Maryland commuter buses. It continues into suburban residential areas of Waldorf, passing by the entrance to the Pinefield neighborhood, which used to be intertwined with several Nike Missile installations. The route crosses CSX's Popes Creek Subdivision railroad line at-grade before coming to an intersection with US 301 (Crain Highway). This intersection has no direct access from northbound MD 5 to southbound US 301, with access provided by Mattawoman Drive. Here, MD 5 forms a concurrency with US 301 and continues north as a six-lane divided highway.Prince George's County
The Crain Highway crosses the Mattawoman Creek into Prince George's County, where it heads north through wooded areas with some businesses along the road. US 301 splits from MD 5 at an interchange near Brandywine with MD 5 continuing to the north on four-lane divided Branch Avenue. A short distance past US 301, the route comes to an interchange that connects to Brandywine Road and MD 373 (Accokeek Road), where it briefly widens to six lanes.  It continues north as a four-lane divided highway through woodland with some businesses and adjacent residential areas before passing by the MedStar Southern Maryland Hospital Center at the Surratts Road intersection. Past Surratts Road, the route heads through suburban residential areas of Clinton as a six-lane road before turning into a freeway that comes to a single-point urban interchange (SPUI) with MD 223 (Woodyard Road).The route heads northwest through commercial areas, with interchanges located at Malcolm Road (MD 5M)/Schultz Road and Coventry Way (MD 5L), the latter being a single-point urban interchange. The route has a southbound exit to Old Branch Avenue and a northbound entrance from Old Alexandria Ferry Road before it turns north and heads through wooded surroundings, forming the western boundary of Andrews Air Force Base. MD 5 comes to another SPUI with MD 337 (Allentown Road) in Camp Springs. A short distance later, the road interchanges with Manchester Drive (MD 5R)/Linda Lane (MD 5Q) before heading north as a freeway to an interchange with I-95/I-495 (Capital Beltway).
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