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Interstate 55 (I - 55) is an Interstate Highway in the central United Statesmarker. Its odd number indicates that it is a north-south Interstate Highway. I - 55 goes from Laplace, Louisianamarker (25 miles (40 kilometers) west of New Orleansmarker) at Interstate 10 to Chicagomarker at U.S. Route 41 (Lake Shore Drivemarker), at McCormick Placemarker.

The section of I-55 between Chicago and St. Louismarker was built as an alternate route for U.S. Highway 66.

I-55 is the only Interstate Highway that crosses the Mississippi River twice: once at Memphis, Tennesseemarker, and again at St. Louis, Missourimarker.

In 2009, officials in Green Bay, Wisconsin, began a campaign to have U.S. Highway 41 in that area designated as I-55. A section of U.S.-41 in Wisconsin is in the process of being rebuilt as an Interstate Highway. Some local officials in the Green Bay area think that designating U.S.-41 as Interstate 55 would bring additional attention to that area. The main alternative is designating that highway as a spur of I - 43. (Sourced from the Green Bay Press Gazette 02-08-09)

Route description


In Louisianamarker, I-55 runs nearly from south to north, from Interstate 10 near Laplacemarker - roughly west of New Orleansmarker - to the Mississippimarker state line near Kentwood, Louisianamarker.Approximately 1/3 of the distance consists of the Manchac Swamp bridge, supposedly the third-longest viaduct in the world.


In Mississippimarker, I - 55 runs from the Louisianamarker border near Osyka, Mississippimarker to Southavenmarker on the Tennesseemarker border, just south of Memphismarker.Noteworthy cities and towns that I - 55 passes through or close by to are McCombmarker, Jacksonmarker, and Grenadamarker.This highway parallels U.S.51in its path roughly through the center of Mississippi.

The Mississippean section of I - 55 is defined in the Mississippi Code ยง 65-3-3.

I-44/55/64/70 on one highway sign in downtown St. Louis

I - 55 in this area is sometimes called the Mississippi Delta Highwaybecause of its proximity to the Mississippi River. The eight miles (13 km) from Hernando to the Tennessee state line coincide with the newer Interstate 69.


I - 55 in Tennessee lies entirely within the city of Memphismarker, passing through the southern and western parts of the city and providing a bypass of downtown for motorists who do not want to take Interstates I - 240 and I - 40 through downtown to cross the Mississippi River.However, the western portion of this highway, which passes through an industrialized section of the city, contains numerous low-clearance bridges, and also an very tight 270 degree cloverleaf turn northbound at Crump Boulevard. The Tennessee Department of Transportation currently has an Interchange Improvement Projectfor this portion. Heavy truck traffic heading to and from Arkansas in this area is hence directed to detour via I - 240 and I - 40.

I - 255 was the former numbering of I - 240 between I - 55 and I - 40 through midtown Memphis, Tennesseemarker.


I - 55 enters Arkansas from Tennessee as it crosses the Mississippi river. It overlaps I - 40 for approximately 2.8 miles (4.5 km) in West Memphis. After separating from I - 40, I - 55 turns northward and runs to the Missouri border, via the intersection with the stretch of U.S.-63that holds the future alignment of the new Arkansas Interstate 555.


In Missouri, I-55 runs from the southeastern part of the state, at the Arkansas border, to St. Louis. In this city, Interstate 44merges in with I-55, and both join Interstate 64and Interstate 70(on the Poplar Street Bridge), then cross the Mississippi River into Illinois.

Among the cities and towns served by I-55 in Missouri is Cape Girardeaumarker.


I-55 largely follows the former U.S.66route through Illinois. Entering Illinois from the south, I-55, near the I-270/I-70split, is referred to as the Paul Simon Freeway. This is in reference to the former U.S. Congressman Paul Simonfrom this region. Further north, between the St. Louis area and Springfieldmarker, I-55 is named The Vince Demuzio Expressway in reference to Illinois state politician Vince Demuzio.I-55 parallels the historic U.S.Route 66 from East St. Louismarker to Joliet, Illinoismarker, passing around the state capital of Springfield, and also Bloomingtonmarker.

When this expressway was being planned during the 1960s, the Illinois Governor Otto Kerner, Jr., made an effort to have the expressway routed close to the larger city of Peoria instead of the straighter route through the Bloomington-Normal area. This ultimately failed plan was ridiculed in the press as the "Kerner Curve". The transportation need of an expressway connection between Springfield and Peoria was later filled by the spur route Interstate 155. This also connects with nearby Lincoln and Morton and forms a triangle between the three population centers in Central Illinois.

In the Chicago area, the expressway is referred to as the Adlai E. Stevenson Expressway in honor of Adlai E.Stevenson II.

Major intersections

Auxiliary routes


External links


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