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U.S. Highway 11 in Louisiana (US 11) runs from the national southern terminus at US 90 in New Orleans to the Mississippi state line south of Picayune. The route parallels Interstate 10 (I-10) across Lake Pontchartrain and into Slidell, serving as that city's major north–south arterial. After crossing I-12, it parallels I-59 to Pearl River, at which point the two highways proceed concurrently across the state line. The portion of US 11 between Slidell and Pearl River was once part of the Old Spanish Trail, an early auto trail that largely became the route of US 90 when the numbered U.S. Highway System was implemented in 1926. US 11 originally terminated in Mississippi just northwest of what is now the John C. Stennis Space Center.〔 In 1937, US 90 was relocated onto a new route bypassing Slidell and Pearl River, significantly reducing the distance between New Orleans and the Mississippi Gulf Coast. US 11 was extended into Louisiana two years later over the former alignment of US 90, and the two routes proceeded concurrently into Downtown New Orleans.〔 In 1951, US 11 was cut back to its current southern terminus at US 90 in Eastern New Orleans. Until the construction of the Interstate Highway System in the area during the late 1950s to mid 1960s, US 11 was one of two major routes eastward out of New Orleans, the other being US 90. Both still serve as important alternate routes to I-10 when hurricanes threaten the area, as was perhaps most evident when, in August 2005, Hurricane Katrina heavily damaged the nearby I-10 Twin Span Bridge over Lake Pontchartrain, rendering the crossing completely impassable for over six weeks. (The US 11 Bridge, constructed in 1928, had sustained only minor damage.) North of Pearl River, US 11 does not serve a similar function, however, since it was moved onto I-59 in 1965 and no longer retains a separate crossing over the west and east branches of the Pearl River. ==Route description== From the south, US 11 begins at an intersection with US 90 (Chef Menteur Highway) in Eastern New Orleans between Michoud and Venetian Isles. It proceeds north as an undivided two-lane highway for through an area known as Irish Bayou to Point Aux Herbes, where it passes through an interchange with I-10 at Exit 254. US 11 immediately continues northeast onto the Maestri Bridge, a span across Lake Pontchartrain that parallels the I-10 Twin Span Bridge.〔 About midway across the lake, US 11 crosses from Orleans Parish (coextensive with the city of New Orleans) into St. Tammany Parish and begins to closely follow along the east side of the Norfolk Southern Railway (NS) trestle. Making landfall in North Shore, US 11 becomes known as Pontchartrain Drive and passes through the community of Eden Isle. US 11 gains a center turning lane at Oak Harbor Boulevard, and immediately afterward, the highway enters the city of Slidell and widens to accommodate a second lane in either direction.〔〔 In Slidell, US 11 curves to the northwest and intersects LA 433 (Old Spanish Trail). The center lane disappears, and the two highways become concurrent for a short distance until an intersection with Front Street. Here, US 11 turns back to the northeast alongside the Norfolk Southern Railway tracks while LA 433 continues straight ahead across the rail line. US 11 follows Front Street through Slidell's historic district and intersects US 190 Business at Fremaux Avenue, beginning a brief concurrency for several blocks to an intersection with mainline US 190 at Gause Boulevard. Here US 190 Business reaches its western terminus, and US 11 continues northward along Front Street, narrowing again to an undivided, two-lane highway. Just beyond Indiana Avenue, a local street, US 11 crosses to the west side of the Norfolk Southern tracks via an overpass. Proceeding north for , US 11 reaches the northern limit of Slidell and enters a partial cloverleaf interchange with I-12 at Exit 83, briefly widening to a divided, four-lane highway. I-12 heads west toward Mandeville and Covington and east to a major interchange with I-10 and I-59.〔〔〔 Returning to two-lane capacity, US 11 continues north through a sparsely-developed area known as Alton and intersects LA 1091 (Robert Boulevard). later, US 11 enters the town of Pearl River and intersects LA 41 (Watts Road), which heads north toward Bogalusa. From this intersection, LA 3081 continues north along Main Street while US 11 turns southeast onto Concord Boulevard. Shortly afterward, US 11 enters an interchange with I-59 at Exit 3, which also marks the northern terminus of LA 1090 (Military Road). US 11 turns north to follow the on-ramp to I-59 and utilizes the interstate's alignment for the remainder of the distance in Louisiana.〔〔〔 After , I-59/US 11 reaches Exit 5A, which forms the northern terminus of LA 3081 and provides another connection to Pearl River. Immediately following this interchange, the highway crosses the northern town limit and proceeds onto a bridge over the West Pearl River. Just north of the bridge is Exit 5B, an interchange with a local road known as Old US 11, part of the pre-interstate alignment that now serves the Pearl River Wildlife Management Area. I-59/US 11 proceeds northward through the Honey Island Swamp and, after , reaches its final interchange, Exit 11 (Pearl River Turnaround). It then crosses the main branch of the Pearl River into Mississippi at a point south of Picayune.〔〔〔 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「U.S. Route 11 in Louisiana」の詳細全文を読む スポンサード リンク
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