Interstate 12

Interstate 12
Republic of West Florida Parkway
Route information
Maintained by Louisiana DOTD
Length:	85.59 mi (137.74 km)
Existed:	1957 (planned); 1967 (first section opened); 1976 (completed) – present
Major junctions
West end:	I-10 in Baton Rouge
	US 61 in Baton Rouge I-55 in Hammond US 51 in Hammond US 190 between Covington and Mandeville US 11 in Slidell
East end:	I-10 / I-59 in Slidell
Location
Parishes:	East Baton Rouge, Livingston, Tangipahoa, St. Tammany
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Louisiana Highway System Interstate US State ← US 11 LA 12 →

US 61 in Baton Rouge
I-55 in Hammond
US 51 in Hammond
US 190 between Covington and Mandeville

Interstate 12 (I-12) is an Interstate Highway located entirely within the U.S. state of Louisiana. It spans a total of 85.59 miles (137.74 km) 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. Skirting the northern shore of Lake Pontchartrain, I-12 serves as a northern bypass of the New Orleans metropolitan area and as an alternate route for I-10, which serves the city of New Orleans itself.

...
Wikipedia