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Interstate 12
Interstate 12 (I-12) is an intrastate Interstate Highway located entirely within the U.S. state of Louisiana. It spans a total of in an east–west direction from I-10 in Baton Rouge to an interchange with both I-10 and I-59 in Slidell. Along the way, it passes through the city of Hammond, where it intersects I-55 and US 51. It also serves the smaller cities of Denham Springs and Ponchatoula, as well as the St. Tammany Parish cities of Covington and Mandeville which, like Slidell, are part of the New Orleans metropolitan area.
I-12 parallels the older US 190 corridor and traverses the North Shore of Lake Pontchartrain in the southeastern portion of the state. Its length is relatively short for a mainline interstate and is comparable with some of the longer auxiliary interstates in the country. It is also the shortest mainline interstate to terminate at the same route (I-10) at either end. Apart from serving the various communities of the North Shore, I-12 acts as a long bypass of New Orleans and is heavily used as a shortcut for through traffic on I-10. While I-10 curves to the south to pass through the city limits, I-12 takes a more direct alignment, reducing the distance between Baton Rouge and Slidell by about .
In 1993, the Louisiana state legislature designated I-12 as the Republic of West Florida Parkway. In 2003, signs identifying the highway's official name and bearing the flag of the Republic of West Florida were erected by the Louisiana Department of Transportation and Development (LADOTD) in order to highlight the unique history of Louisiana's Florida Parishes.
Louisiana is in the process of widening I-12 to three lanes in locations where the interstate is still two lanes in each direction.
==Route description==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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