Interstate 49 (I-49) is a north–south Interstate Highway with multiple segments. The original portion is entirely within Louisiana with an additional signed portion extending from I-220 in Shreveport to the Arkansas state line, three newer sections are in Arkansas, and one section in Missouri. Its southern terminus is in Lafayette, Louisiana, at I-10 while its northern terminus is in Kansas City, Missouri, at I-435 and I-470. Future plans include portions of the remaining roadway in Louisiana, Arkansas, and Texas, to link Kansas City, Missouri with New Orleans.
U.S. Route 61 or U.S. Highway 61 (U.S. 61) is a major United States highway that extends 1,400 miles (2,300 km) between New Orleans, Louisiana and the city of Wyoming, Minnesota. The highway generally follows the course of the Mississippi River and is designated the Great River Road for much of its route. As of 2004, the highway's northern terminus in Wyoming, Minnesota, is at an intersection with Interstate 35 (I-35). Until 1991, the highway extended north on what is now Minnesota State Highway 61 through Duluth to the Canada–U.S. border near Grand Portage, then continued to Thunder Bay, Canada, as Ontario Highway 61. Its southern terminus in New Orleans is at an intersection with U.S. Route 90. The route was an important south–north connection in the days before the interstate highway system.
U.S. Route 71 or U.S. Highway 71 is a major north–south United States highway that extends for over 1500 miles (2500 km) in the central United States. This original 1926 route has remained largely unchanged by encroaching Interstate highways. Currently, the highway's northern terminus is in International Falls, Minnesota at the Canada–US border, at the southern end of the Fort Frances-International Falls International Bridge to Fort Frances, Ontario. U.S. Route 53 also ends here. On the other side of the bridge, Trans-Canada Highway is an east–west route while Ontario Highway 71 is a north–south route. US 71's southern terminus is between Port Barre and Krotz Springs, Louisiana at an intersection with U.S. Route 190. For the entirety south of Kansas City, Missouri, US 71 runs parallel and concurrent with the existing and future Interstate 49. North of Kansas City, US 71 runs halfway between Interstate 29 and Interstate 35, which they split in the city at an interchange with Interstate 70.
U.S. Highway 171 (US 171) is a part of the United States Numbered Highway System and the only route within that system currently located entirely within the state of Louisiana. It spans 177.44 miles (285.56 km) in a north–south direction from the junction of US 90 and Louisiana Highway 14 (LA 14) in Lake Charles to the junction of US 79/US 80 and LA 3094 in Shreveport.
U.S. Route 167 is a north-south United States Highway within the U.S. states of Louisiana and Arkansas. It runs for 500 miles (800 km) from Ash Flat, Arkansas at U.S. Route 62/U.S. Route 412 to Abbeville, Louisiana at Louisiana Highway 14. It goes through the cities of Little Rock, Arkansas, Alexandria, Louisiana, and Lafayette, Louisiana.
Interstate 10 (I-10), a major transcontinental Interstate Highway in the Southern United States, runs across the southern part of Louisiana for 274.42 miles (441.64 km) from Texas to Mississippi. It passes through Lake Charles, Lafayette, and Baton Rouge, dips south of Lake Pontchartrain to serve the New Orleans metropolitan area, then crosses Lake Pontchartrain and leaves the state.
Airline Highway is a divided highway in the U.S. state of Louisiana, built in stages between 1925 and 1953 to bypass the older Jefferson Highway. It runs 115.6 miles (186.0 km), carrying U.S. Highway 61 from New Orleans northwest to Baton Rouge and U.S. Highway 190 from Baton Rouge west over the Mississippi River on the Huey P. Long Bridge. US 190 continues west towards Opelousas on an extension built at roughly the same time.
Louisiana Highway 1 (LA 1) is a state highway in Louisiana. At 431.88 miles (695.04 km), it is the longest numbered highway of any class in Louisiana. It runs diagonally across the state, connecting the oil and gas fields near the island of Grand Isle with the northwest corner of the state, north of Shreveport.
Louisiana Highway 3 (LA 3) is a state highway located in Bossier Parish, Louisiana. It runs 35.71 miles (57.47 km) in a north–south direction from the junction of Interstate 20 (I-20), U.S. Highway 71 (US 71), and LA 72 in Bossier City to the Arkansas state line north of Plain Dealing.
Louisiana Highway 30 (LA 30) is a state highway located in southeastern Louisiana. It runs 28.10 miles (45.22 km) in a northwest to southeast direction from LA 73 in Baton Rouge to the junction of U.S. Highway 61 (US 61) and LA 431 east of Gonzales.
Louisiana Highway 54 (LA 54) is a state highway located in St. John the Baptist Parish, Louisiana. It runs 2.34 miles (3.77 km) in a north–south direction from LA 44 to U.S. Highway 61 (US 61) in Garyville.
Louisiana Highway 76 (LA 76) is a state highway located in southeastern Louisiana. It runs 25.52 miles (41.07 km) in a general east–west direction from LA 77 in Maringouin to the junction of LA 1 and LA 987-4 in Port Allen.
U.S. Highway 11 (US 11) is a part of the United States Numbered Highway System that spans 1,645 miles (2,647 km) from New Orleans, Louisiana, to Rouses Point, New York. Within the state of Louisiana, the highway travels 31 miles (50 km) from the national southern terminus at US 90 in New Orleans to the Mississippi state line south of Picayune.
U.S. Highway 51 (US 51) is a part of the United States Numbered Highway System that spans 1,277 miles (2,055 km) from LaPlace, Louisiana to a point north of Hurley, Wisconsin. Within the state of Louisiana, the highway travels 69.12 miles (111.24 km) from the national southern terminus at US 61 in LaPlace to the Mississippi state line north of Kentwood.
U.S. Highway 65 (US 65) is a part of the United States Numbered Highway System that spans 966 miles (1,555 km) from Clayton, Louisiana to Albert Lea, Minnesota. Within the state of Louisiana, the highway travels 100.77 miles (162.17 km) from the national southern terminus at US 425/LA 15 in Clayton to the Arkansas state line north of Lake Providence.
Louisiana Highway 158 (LA 158) is a state highway located in Grant Parish, Louisiana. It runs 6.36 miles (10.24 km) in a north–south direction from LA 8 in Colfax to a junction of local roads near Lake Iatt, north of Colfax.
Louisiana Highway 72 (LA 72) is a state highway located in Bossier City, Louisiana. It runs 2.49 miles (4.01 km) in an east–west direction from the intersection of Barksdale Boulevard and Hamilton Road to a junction with the concurrent U.S. Highways 79 and 80.
Louisiana State Route 1 was one of the 98 original state highways that were established in 1924. It was signed for the Jefferson Highway, an auto trail that ran from New Orleans to Winnipeg. LA 1 curved through the entire state, spanning from Shreveport through Alexandria and Baton Rouge to New Orleans, ending south of Pointe a la Hache. It was renumbered for the most part as US 71 and US 171.
