Editing Montgomery County, Maryland (section)

===Roads===
[[File:2019-07-12 11 25 04 View north along Interstate 270 (Washington National Pike) from the overpass for West Gude Drive in Rockville, Montgomery County, Maryland.jpg|thumb|right|I-270 northbound in Rockville]]
Poor transportation was a hindrance for Montgomery County's farmers who wanted to transport their crops to market in the early 18th century. Montgomery County's first roads, often barely adequate, were built by the 18th century.

One early road, [[Maryland Route 355]], connected [[Frederick, Maryland|Frederick]] and [[Georgetown, Washington, D.C.|Georgetown]]. There was a road, [[Maryland Route 190]] that connected Georgetown and the [[Monocacy Aqueduct|mouth]] of the [[Monocacy River]]. Plans to continue the road to [[Cumberland, Maryland|Cumberland]] did not come to fruition. Another road connected the Montgomery County Courthouse with [[Sandy Spring, Maryland|Sandy Spring]] and [[Baltimore]], and one other road connected the courthouse with [[Bladensburg, Maryland|Bladensburg]] and [[Annapolis, Maryland|Annapolis]].<ref name="centuries">{{cite book |last1=Sween |first1=Jane C. |last2=Offutt |first2=William |title=Montgomery County: Centuries of Change |date=1999 |publisher=American Historical Press |isbn=1-892724-05-7}}</ref><ref name="THS Boyd">{{cite book |last=Boyd |first=T.H.S. |title=The History of Montgomery County, Maryland from Its Earliest Settlement in 1650 to 1879 |url=https://commons.wikimedia.org/wiki/File:The_history_of_Montgomery_county,_Maryland,_from_its_earliest_settlement_in_1650_to_1879_.._(IA_historyofmontgom00boy).pdf |date=1879 |publisher=Regional Publishing Company |location=Clarksburg, MD |access-date=November 28, 2020 |archive-date=February 17, 2022 |archive-url=https://web.archive.org/web/20220217181938/https://commons.wikimedia.org/wiki/File:The_history_of_Montgomery_county,_Maryland,_from_its_earliest_settlement_in_1650_to_1879_.._(IA_historyofmontgom00boy).pdf |url-status=live }}</ref>{{rp|52–54}}{{rp|75–83}}

The county's first turnpike was chartered in 1806, but its construction began in 1817. In 1828, the turnpike was completed, running from Georgetown to [[Rockville, Maryland|Rockville]]. It was the first paved road in Montgomery County.<ref name= centuries/><ref name="THS Boyd"/>{{rp|75–83}}

In 1849, the Seventh Street Turnpike (now called [[Maryland Route 97|Georgia Avenue]]) was extended from Washington to [[Brookeville, Maryland|Brookeville]]. The Colesville–Ashton Turnpike was built in 1870 (now parts of [[U.S. Route 29 in Maryland|Colesville Road, Columbia Pike]], and [[Maryland Route 650|New Hampshire Avenue]]).<ref name="THS Boyd"/>{{rp|75–83}}

The [[United States Army Corps of Engineers]] built the [[Washington Aqueduct]] between 1853 and 1864, to supply water from [[Great Falls (Potomac River)|Great Falls]] to Washington. The aqueduct was covered in 1875, and it became known as Conduit Road. The [[Union Arch Bridge]], which carries the aqueduct across [[Cabin John Creek]], was the longest single-arch bridge in the world at the time it was completed in 1864. The road is now named [[MacArthur Boulevard (Washington, D.C.)|MacArthur Boulevard]].<ref name=centuries/><ref name="THS Boyd"/>{{rp|75–83}}

====Major highways and roads====
{{colbegin}}
* {{jct|state=MD|I|270}}
* {{jct|state=MD|I-Spur|270}}
* {{jct|state=MD|I|370}}
* {{jct|state=MD|I|495}}
* {{jct|state=MD|US|29}}
* {{jct|state=MD|MD|27}}
* {{jct|state=MD|MD|28}}
* {{jct|state=MD|MD|80}}
* {{jct|state=MD|MD|97}}
* {{jct|state=MD|MD|107}}
* {{jct|state=MD|MD|108}}
* {{jct|state=MD|MD|109}}
* {{jct|state=MD|MD|112}}
* {{jct|state=MD|MD|115}}
* {{jct|state=MD|MD|117}}
* {{jct|state=MD|MD|118}}
* {{jct|state=MD|MD|119}}
* {{jct|state=MD|MD|121}}
* {{jct|state=MD|MD|124}}
* {{jct|state=MD|MD|182}}
* {{jct|state=MD|MD|185}}
* {{jct|state=MD|MD|186}}
* {{jct|state=MD|MD|187}}
* {{jct|state=MD|MD|188}}
* {{jct|state=MD|MD|189}}
* {{jct|state=MD|MD|190}}
* {{jct|state=MD|MD|191}}
* {{jct|state=MD|MD|198}}
* {{jct|state=MD|MD-Toll|200}}
* {{jct|state=MD|MD|320}}
* {{jct|state=MD|MD|355}}
* {{jct|state=MD|MD|390}}
* {{jct|state=MD|MD|396}}
* {{jct|state=MD|MD|410}}
* {{jct|state=MD|MD|586}}
* {{jct|state=MD|MD|650}}
{{colend}}