Original: Interstate 12 (I-12) is an intrastate Interstate Highway located entirely within the state of Louisiana. I-12 starts in Baton Rouge at Interstate 10, and travels along the North Shore of Lake Pontchartrain before ending at the intersection of Interstate 10 and Interstate 59 near Slidell.
Simplified: Interstate 12 is a 85.59 m long Interstate Highway in Louisiana, connecting Interstate 10 at each end.