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Maryland Route 108 (MD 108) is a state highway in the U.S. state of Maryland. The highway runs from MD 27 in Damascus to MD 175 in Columbia. MD 108 is an S-shaped highway that winds through the northern Montgomery County and central Howard County. The highway connects the Montgomery County communities of Laytonsville, Olney, Sandy Spring, and Ashton with the Howard County villages of Highland and Clarksville. MD 108 serves as the northern edge of Columbia and connects several of the planned community's suburban villages. MD 108 originally connected Damascus with Olney. This highway was constructed between the mid-1920s and early 1930s. MD 108 from Olney to Columbia, part of Clarksville Pike, was originally constructed as MD 28 from Olney to Ashton and the original MD 27—later U.S. Route 29 (US 29)—from Ashton to Columbia. The highway was constructed near Columbia in the mid-1910s and from there to Olney in the late 1910s. MD 108 east of US 29 originally consisted of a county road and MD 531, which was built in the early 1930s and later became MD 175. MD 108 was extended east from Olney to Ashton in the mid-1940s and from Ashton to MD 175 in 1960 after US 29's present highway was built. The highway was extended to its present eastern terminus in the mid-1970s. MD 108 was expanded to a divided highway in Columbia in the late 1980s and in Olney in the mid-1990s. ==Route description== MD 108 begins at a three-way intersection with MD 27 (Ridge Road) in the center of Damascus. The latter highway heads north and west from the intersection; MD 108 heads east as four-lane Main Street. The street reduces to two lanes just east of Woodfield Road, which heads south as MD 124. MD 108's name changes to Damascus Road at Howard Chapel Road at the east end of the village. The highway heads southeast and meets the southern end of Annapolis Road Road, which leads to MD 94 at the Montgomery–Howard county line. MD 108 meets the northern end of MD 650 (Damascus Road) in the hamlet of Etchison, where the highway turns south onto Laytonsville Road. The route intersects Brink Road and Sundown Road next to the Layton House in the center of the town of Laytonsville.〔〔 MD 108 veers southeast out of Laytonsville and continues along Laytonsville Olney Road. The highway passes a pair of gold courses and the historic home Oaks II. MD 108 also passes near the historic homes The Ridge, via Muncaster Road, and Clover Hill, via Zion Road. The route expands to a four-lane divided highway at the western edge of Olney. In the center of the unincorporated suburb, MD 108 intersects MD 97 (Georgia Avenue) and its name changes to Olney Sandy Spring Road. The route continues southeast to the eastern edge of Olney, where the highway crosses James Creek and meets the northern end of MD 182 (Dr. Bird Road) next to Our Lady of Good Counsel High School and the Olney Theatre Center for the Arts. MD 108 veers northeast, drops to two lanes, and passes through the historic community of Sandy Spring, which is named for the nearby Sandy Spring Friends Meetinghouse. The highway gains a center turn lane and passes Sherwood High School before intersecting MD 650 (New Hampshire Avenue) in the village of Ashton.〔〔 MD 108 leaves Ashton as two-lane Ashton Road, which the route follows to the Montgomery–Howard county line at the Patuxent River. The highway continues northeast as Clarksville Pike through the village of Highland, where it meets the western end of MD 216 (Scaggsville Road) and Highland Road. MD 108 continues through the village of Clarksville, where the highway intersects Guilford Road and Ten Oaks Road. Just north of the latter road, the highway expands to four lanes at its diamond interchange with MD 32, which heads east as the Patuxent Freeway and northwest as Sykesville Road. MD 108 gains a center turn lane as it begins to pass along the northern edge of the large, planned community of Columbia. The highway passes along the edge of the westernmost of Columbia's villages, River Hill, before reducing to two lanes and crossing the Middle Patuxent River. MD 108 continues east along the northern edge of the villages of Harper's Choice and Wilde Lake; between the two, the route passes historic Clark's Elioak Farm.〔〔 MD 108 expands to a four-lane divided highway south of Lake Centennial and just west of its crossing of the Little Patuxent River in the village of Dorsey's Search. The route meets US 29 (Columbia Pike) at a cloverleaf interchange and curves southeast as Old Annapolis Road. MD 108 reduces to two lanes and passes along the northern edge of the Oakland Mills village. The highway passes Howard High School and has an interchange with eastbound MD 100. Access to westbound MD 100 is immediately to the east via MD 104 (Waterloo Road). MD 108 turns south onto Waterloo Road, passes the historic Curtis-Shipley Farmstead, and intersects Snowden River Parkway, which ends at its interchange with MD 100 to the east. The state highway continues south along the eastern edge of the village of Wilde Lake. South of Old Waterloo Road, MD 108 expands to four lanes and gains a median shortly before reaching its eastern terminus at MD 175 (Rouse Parkway) a short distance west of MD 175's interchange with Interstate 95 (I-95).〔〔 MD 108 is a part of the National Highway System as a principal arterial in three sections: from its western terminus at MD 27 in Damascus to Mullinix Mill Road; from Brookeville Road near Olney to MD 650 in Ashton; and from MD 216 at Highland to MD 32 in Clarksville.〔〔 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 108」の詳細全文を読む スポンサード リンク
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