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The Interstate Highway System in Louisiana consists of 933.84 miles (1,502.87 km) [4] of freeways constructed and maintained by the Louisiana Department of Transportation and Development (La DOTD). The system was authorized on June 29, 1956 when President Dwight D. Eisenhower signed into law the Federal Aid Highway Act of 1956 . [ 1 ]
The U.S. Highway System in Louisiana consists of 2,490.851 miles (4,008.636 km) of mainline highway routes and 107.785 miles (173.463 km) of special routes (both figures including concurrencies) that are constructed and maintained by the Louisiana Department of Transportation and Development (La DOTD).
Louisiana Highway 728 (LA 728) is a collection of two state highways in Walroy south of Lafayette in Lafayette Parish. Both highways are part of Hugh Wallis Road and generally run parallel to US 90 and a BNSF railroad. LA 728-2 (0.37 miles or 0.60 kilometres) begins at a curve tangent and heads north-northwest past a hotel and a few homes.
Interstate 55 (I-55) is a part of the Interstate Highway System that spans 964.25 miles (1,551.81 km) from LaPlace, Louisiana, to Chicago, Illinois. [2] Within the state of Louisiana, the highway travels 66 miles (106 km) from the national southern terminus at I-10 in LaPlace to the Mississippi state line north of Kentwood.
U.S. Highway 51 (US 51) is a part of the United States Numbered Highway System that spans 1,277 miles (2,055 km) [2] from LaPlace, Louisiana to a point north of Hurley, Wisconsin. Within the state of Louisiana, the highway travels 69.12 miles (111.24 km) [ 1 ] from the national southern terminus at US 61 in LaPlace to the Mississippi state line ...
U.S. Highway 65 (US 65) is a part of the United States Numbered Highway System that spans 966 miles (1,555 km) [2] from Clayton, Louisiana to Albert Lea, Minnesota.Within the state of Louisiana, the highway travels 100.77 miles (162.17 km) [1] from the national southern terminus at US 425/LA 15 in Clayton to the Arkansas state line north of Lake Providence.
Interstate 20 (I-20) is a part of the Interstate Highway System that spans 1,539.38 miles (2,477.39 km) from Reeves County, Texas, to Florence, South Carolina. [2] Within the state of Louisiana, the highway travels 189.84 miles (305.52 km) from the Texas state line west of Greenwood to the Mississippi River, [1] which it crosses into Vicksburg, Mississippi.
In the mid-1970s, the Federal Highway Administration (FHWA) approved an Interstate Highway to run between I-10 and I-20, beginning at I-10 in Lafayette and ending at I-20 in Shreveport. The mileage was gained from mileage released from other highways the states did not build as well as 153 miles (246 km) from a supplemental reserve.