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|direction_b=North |terminus_b= in Adelphi |counties=Montgomery, Prince George's |previous_type=MD |previous_route=318 |next_type=MD |next_route=322 |browse= }} Maryland Route 320 (MD 320) is a state highway in the U.S. state of Maryland. Known as Piney Branch Road, the highway runs from Eastern Avenue at the District of Columbia boundary in Takoma Park north to MD 650 in Adelphi. MD 320 is a southwest–northeast highway that connects Takoma Park and Silver Spring in southeastern Montgomery County with Adelphi in far western Prince George's County. The state highway originally extended from downtown Silver Spring to White Oak and connected with U.S. Route 29 (US 29) at both ends. The Silver Spring–Adelphi portion of the highway was constructed by 1910. The segment through Takoma Park and the Adelphi–White Oak segment, which later became MD 650, were built in the early 1930s; the Takoma Park portion was built as MD 513. MD 320 was widened over its whole length in the late 1940s and reduced to its present course in the mid-1950s. ==Route description== MD 320 begins at the intersection of Piney Branch Road and Eastern Avenue at the District of Columbia boundary in the city of Takoma Park. Piney Branch Road continues southwest into Washington, where it immediately passes under CSX's Metropolitan Subdivision and the Washington Metro's Red Line. Eastern Avenue provides access to the Takoma station on the Red Line and the Takoma Park Historic District to the southeast; the street also leads to the Takoma Park/Silver Spring campus of Montgomery College to the northwest. MD 320 heads northeast as a narrow two-lane road. The highway expands as it veers north at one-way Chestnut Avenue and intersects MD 410 (Philadelphia Avenue). The highway curves northeast and gains a center turn lane as it leaves the city of Takoma Park and passes Takoma Park Middle School.〔〔 MD 320 parallels the city limits to Mississippi Avenue, where the highway fully enters the unincorporated area of Silver Spring. MD 320 intersects Sligo Avenue and Dale Drive, then descends into the valley of Sligo Creek. The highway crosses the creek and intersects Sligo Creek Parkway and the Sligo Creek Trail. At the top of its climb out of the creek valley, MD 320 intersects Flower Avenue, which was formerly MD 787. The highway continues east as a four-lane road with center turn lane, crossing Long Branch before intersecting MD 193 (University Boulevard). Beyond MD 193, MD 320 descends into the valley of Northwest Branch. The highway meets the northern end of Carroll Avenue, which leads south to MD 195. MD 320 crosses the Montgomery–Prince George's County line and crosses Northwest Branch before it reaches its northern terminus at MD 650 (New Hampshire Avenue) in Adelphi.〔〔 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 320」の詳細全文を読む スポンサード リンク
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