Maryland Route 396 is a state highway in the U.S. state of Maryland. Known as Massachusetts Avenue, the highway runs 2.23 miles (3.59 km) from MD 614 southeast to Westmoreland Circle near the District of Columbia boundary in Bethesda. MD 396 is an extension of Washington's Massachusetts Avenue into southwestern Montgomery County. The highway was constructed from Westmoreland Circle to Glen Echo in the early to mid-1930s. MD 396 was rolled back to its present western terminus in favor of MD 614 in the late 1970s.
Maryland Route 185 is a state highway in the U.S. state of Maryland. Known as Connecticut Avenue, the state highway runs 8.30 mi (13.36 km) from Chevy Chase Circle at the Washington, D.C., border north to MD 97 in Aspen Hill. MD 185 serves as a major north-south commuter route in southern Montgomery County, connecting the District of Columbia with the residential suburbs of Chevy Chase, Kensington, and Wheaton.
Maryland Route 190 is a state highway in the U.S. state of Maryland. Known as River Road, the highway runs 15.88 miles (25.56 km) from MD 112 near Seneca east to Western Avenue at the District of Columbia boundary in Bethesda. MD 190 parallels the Potomac River through the affluent southwestern Montgomery County communities of Potomac and Bethesda and connects those suburbs with Interstate 495 (I-495). River Road was paved from Washington, D.C. west through part of Bethesda in the early 1910s. A second section of MD 190 was constructed through Potomac in the mid-1920s. The Bethesda and Potomac portions of the route were unified in the late 1920s. MD 190 was extended west toward Seneca in two steps in 1950 and the early 1970s. The highway was expanded to a four-lane divided highway through Bethesda in the early 1960s.
Maryland Route 355 (MD 355) is a 36.75-mile (59.14 km) north–south road in western central Maryland in the United States. The southern terminus of the route, Wisconsin Avenue, is located in Bethesda in Montgomery County, at the county's border with Washington, D.C. It continues south into Washington, D.C. as Wisconsin Avenue NW. The northern terminus is just north of a bridge over Interstate 70 (I-70)/U.S. Route 40 (US 40) in the city of Frederick in Frederick County, where the road continues north as Market Street through Frederick towards MD 26.
Maryland Route 410 (MD 410) is a state highway in the U.S. state of Maryland and known for most of its length as East–West Highway. The highway runs east to west for 13.92 miles (22.40 km) from MD 355 in Bethesda east to Pennsy Drive in Landover Hills. MD 410 serves as a major east–west commuter route through the inner northern suburbs of Washington, D.C., connecting the commercial districts of Bethesda, Silver Spring, and Hyattsville. In addition, the highway serves the industrial area of Landover Hills and the residential suburbs of Chevy Chase, Takoma Park, Chillum, Riverdale, and East Riverdale. The road also connects many of the arterial highways and freeways that head out of Washington. Additionally, it provides a highway connection to transit and commercial hubs centered around Washington Metro subway stations in Bethesda, Takoma Park, Hyattsville, Silver Spring, and New Carrollton–the latter two of which provide additional connections to MARC and Amtrak trains.
Maryland Route 150 (MD 150) is a state highway in the U.S. state of Maryland. Known for most of its length as either Eastern Avenue or Eastern Boulevard, the highway runs 13.01 miles (20.94 km) from U.S. Route 40 (US 40) in Baltimore east to Graces Quarters Road in Chase in eastern Baltimore County. MD 150 connects Baltimore with its southeastern suburbs of Dundalk, Essex, and Middle River. The state highway also links those communities with Interstate 95 (I-95), I-695, I-895, and Martin State Airport. MD 150 was constructed from Baltimore to Middle River and in Chase in the mid-1920s. The road was completed through Middle River in the early 1930s. Between 1942 and 1944, MD 150 was reconstructed as a four-lane divided highway with interchanges to improve access between Baltimore and the Glenn L. Martin Company aircraft manufacturing plant in Middle River. The highway has followed several routes since it was extended west into the city of Baltimore in the mid-1940s; the present route in East Baltimore was established shortly after 2000.
Maryland Route 187 is a state highway in the U.S. state of Maryland. Known as Old Georgetown Road, the highway runs 5.32 miles (8.56 km) from MD 355 and MD 410 in Bethesda north to Executive Boulevard in North Bethesda. MD 187 is a four- to six-lane highway that runs parallel to MD 355 through suburban areas of southern Montgomery County. The highway was paved through Bethesda by 1910. The remainder of MD 187 was constructed in the mid- to late 1920s. The highway was relocated at its northern end and expanded to a divided highway over most of its length in the late 1960s. MD 187's interchanges with Interstate 270 (I-270) and I-495 were built in the late 1950s and early 1960s, respectively; the former interchange was reconstructed in the early 2000s. The northern terminus was cut back from MD 355 to Executive Boulevard in 2016.
Maryland Route 27 is a state highway in the U.S. state of Maryland. Known for most of its length as Ridge Road, the highway runs 39.17 miles (63.04 km) from MD 355 in Germantown north to MD 30 in Manchester. MD 27 follows a ridge that separates several watersheds in northern Montgomery County and Carroll County. The highway connects Germantown and Manchester with Damascus in far northern Montgomery County; Westminster, the county seat of Carroll County; and Mount Airy, which lies at the junction of Carroll, Frederick, Howard, and Montgomery counties and where MD 27 intersects Interstate 70 (I-70)/U.S. Route 40.
U.S. Route 11 (US 11) is a part of the United States Numbered Highway System that runs from New Orleans, Louisiana, to Rouses Point, New York. In Maryland, the federal highway runs 12.83 miles (20.65 km) from the West Virginia state line at the Potomac River in Williamsport north to the Pennsylvania state line near Maugansville. US 11 is the primary north–south surface highway in central Washington County, connecting Hagerstown with Williamsport to the south and Hagerstown Regional Airport to the north. The federal highway was once a major long-distance highway, but that role has been assumed by Interstate 81 (I-81), which parallels US 11 not only in Maryland but for most of its course from Tennessee to Upstate New York. US 11 is maintained by the Maryland State Highway Administration except for the municipally-maintained portions within the corporate limits of Williamsport and Hagerstown.
Maryland Route 51 is a state highway in the U.S. state of Maryland. Known for most of its length as Oldtown Road, the state highway runs 25.53 miles (41.09 km) from an interchange with Interstate 68 (I-68) in Cumberland south to the West Virginia state line at the Potomac River, where the highway continues east as West Virginia Route 9 toward Paw Paw. Around Cumberland, MD 51 is a major highway that provides a bypass of the South End neighborhood of that city and access to industrial areas along the North Branch Potomac River. South of North Branch, MD 51 is a rural highway connecting small communities along the river in southeastern Allegany County, including Oldtown. Documentation from the Maryland State Highway Administration depict the highway as following an east-west alignment, but all signage indicates a north-south road.
Maryland Route 60 is a state highway in the U.S. state of Maryland. Known for most of its length as Leitersburg Pike, the state highway runs 7.27 miles (11.70 km) from the intersection of Potomac Avenue and Northern Avenue/Eastern Boulevard in Hagerstown east to the Pennsylvania state line near Leitersburg, where the highway continues north as Pennsylvania Route 316. MD 60 connects Hagerstown with Leitersburg and Waynesboro, Pennsylvania. MD 60 was paved over the course of an old turnpike from Hagerstown toward Waynesboro in the mid-1920s. The state highway was reconstructed in the mid-1950s, including the highway's bypass of Leitersburg.
Randolph Road is a county highway in the U.S. state of Maryland. The highway is the major component of a mostly four- to six-lane 16.8-mile (27.0 km) highway spanning southern Montgomery County and northwestern Prince George's County that also includes Montrose Road, Josiah Henson Memorial Parkway, and Cherry Hill Road, and forms an important link between eastern Montgomery County and Rockville. Montrose Road begins at Maryland Route 189 in Potomac. The highway heads east through a junction with Interstate 270 (I-270) before the main course continues as Josiah Henson Memorial Parkway in North Bethesda. Josiah Henson Memorial Parkway continues through a junction with MD 355, east of which the highway becomes Randolph Road. Randolph Road intersects MD 586 and MD 185 in Wheaton, MD 97 in Glenmont, and MD 650 in Colesville. The highway continues southeast toward Fairland, where it meets U.S. Route 29. The highway continues from US 29 as Cherry Hill Road through an intersection with MD 212 in Calverton before reaching its eastern end at US 1 in College Park.
Maryland Route 189 is a state highway in the U.S. state of Maryland. Known as Falls Road, the highway runs 5.05 miles (8.13 km) from MD 190 in Potomac to Great Falls Road and Maryland Avenue in Rockville. MD 189 connects Rockville with Potomac and the Great Falls of the Potomac River in southwestern Montgomery County. The highway was constructed from Rockville to Potomac by the early 1920s and extended toward Great Falls in the early 1930s. MD 189 was expanded to a divided highway around its newly-constructed interchange with Interstate 270 (I-270) in the late 1980s. The highway was truncated at both ends in the late 1990s.
Maryland Route 186 is a state highway in Montgomery County in the U.S. state of Maryland. Known as Brookville Road, the highway runs 1.52 miles (2.45 km) from the District of Columbia boundary at Western Avenue to MD 410 within Chevy Chase. MD 186 passes through an affluent, mainly residential area in its course through the many incorporated and unincorporated areas of Chevy Chase. Brookville Road once connected Tenleytown with what is now MD 97 north of Silver Spring. MD 186 was paved over most of its course by 1910. The northernmost part of the highway was paved when MD 410 was built in the late 1920s.
Maryland Route 188 is a state highway in the U.S. state of Maryland. Known as Wilson Lane, the highway runs 3.25 miles (5.23 km) from MacArthur Boulevard near Glen Echo east to MD 187 in Bethesda. MD 188 runs mainly through residential areas in its course through the affluent suburb of Bethesda. The highway was originally paved in the early 1910s and widened in the mid-1920s.
Maryland Route 478 is a state highway in the U.S. state of Maryland. Known as Knoxville Road, the state highway runs 1.88 miles (3.03 km) from MD 180 in Knoxville east to Florida Avenue in Brunswick. MD 478 was constructed as MD 70 in the late 1920s. In 1950, MD 70 was replaced with an extended MD 464. MD 478 was assigned to Knoxville Road after MD 464 was rerouted to its present terminus in 1968.
Maryland Route 614 is a state highway in the U.S. state of Maryland. Known as Goldsboro Road, the state highway runs 1.97 miles (3.17 km) from MacArthur Boulevard near Glen Echo north to MD 191 in Bethesda in southwestern Montgomery County. MD 614 was constructed in the mid-1930s from MD 396 to MD 190. The highway was extended to its present termini in the late 1970s.
U.S. Route 1 Alternate is an alternate route of US 1 in the U.S. state of Maryland. The highway runs 3.92 miles (6.31 km) between intersections with US 1 in Arbutus and in Baltimore. US 1 Alt. serves the southwestern Baltimore County community of Halethorpe and connects US 1 with full-access interchanges with Interstate 95 (I-95) and I-695. The Washington Boulevard portion of the alternate route was the original road southwest from Baltimore in the 18th century and was part of the turnpike southwest to Washington DC for much of the 19th century. The highway was paved in the early 1910s, expanded in the late 1910s and late 1920s, and became part of US 1 in 1926. The Caton Avenue portion of the alternate route was improved and expanded in the 1930s to serve as a rerouting of US 1 in southwest Baltimore. US 1 Alt. was created in 1949 when US 1 was moved to its present course through Arbutus and southwest Baltimore. The alternate route's interchanges with I-695 and I-95 were constructed in the late 1950s and mid-1970s, respectively.
MD 190 in Potomac 
MD 185 in Chevy Chase 
