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|terminus_b= in Manchester |counties=Montgomery, Howard, Frederick, Carroll |previous_type=MD |previous_route=26 |next_type=MD |next_route=28 |browse= }} Maryland Route 27 (MD 27) is a state highway in the U.S. state of Maryland. Known for most of its length as Ridge Road, the highway runs 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) and U.S. Route 40 (US 40). MD 27 follows what were originally MD 29 and part of MD 31. The highway received its present number south of Westminster in a swap with US 29 in 1934 and north of Westminster in 1967. Ridge Road south of Mount Airy and Manchester Road between Westminster and Manchester were constructed as one of the original state roads in the early to mid-1910s. The Mount Airy–Westminster portion of MD 27 was built in the 1920s. MD 27 was reconstructed in the early to mid-1950s from Germantown to Westminster. MD 31 was reconstructed north of Westminster in the late 1950s; old segments of the highway became part of MD 852. MD 27 bypassed Mount Airy in the 1970s, leaving behind MD 808. The highway was relocated at its southern end in the mid-1990s to improve access between Damascus and Germantown and I-270. ==Route description== MD 27 runs on top of or in the vicinity of a long ridge known for most of its length as Parr's Ridge. This ridge separates several sets of watersheds in central Maryland, with the result that MD 27 bridges no significant streams. From Germantown to south of Damascus, the ridge separates the waters of Little Seneca Creek to the west and Great Seneca Creek to the east; these creeks come together at Dawsonville and flow into the Potomac River. From Damascus north, all streams west of the ridge flow into the Monocacy River, including Bennett Creek, Bush Creek, and Little and Big Pipe Creek from south to north. All east-side streams flow into the Patuxent River from Damascus to south of Mount Airy, the South Branch of the Patapsco River from Mount Airy to Taylorsville, and the Patapsco River North Branch from Taylorsville to Manchester.〔〔〔 MD 27 is part of the National Highway System as a principal arterial in five sections: from MD 355 in Germantown to Gue Road in Damascus; from Penn Shop Road south of Mount Airy to the Frederick–Carroll county line; from I-70 to the northern town limit of Mount Airy; from Chapel Road south of Westminster to Old Manchester Road in Mexico; and from the southern town limit of Manchester to MD 30.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Maryland Route 27」の詳細全文を読む スポンサード リンク
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