Major Highways

Interstate-10
From: Mississippi state line
To Texas line/Sabine River
Length in LA: 274.42 mi

US 11
From: Mississippi state line northwest of Pearl River
To East New Orleans
Length in LA: 31 m

Interstate-12
From: I-10 in Baton Rouge
To 1-12 in Slidell
Length in LA: 85.59 mi

US 51
From: Mississippi state line north of Kentwood
To LaPlace
Length in LA: 69 mi

Interstate 49
From: I-20 at Shreveport
To I-10 at Lafayette
Extension to New Orleans planned
Length in LA: 208.6 mi

US 61
From: Mississippi state line north of Laurel Hill
To New Orleans
Length in LA: 126 mi

Interstate 55
From: I-10 near Laplace
To Mississippi line
Length in LA: 65.81 mi

US 90
From: Mississippi state line near Slidell
To Texas state line near Orange, TX
Length in LA: 306 mi

Interstate 59
From: I10/12 near Slidell
To Mississippi line
Length in LA: 11 mi

US 190
From: Jct S.E. of Slidell
To Texas state line W. of Merryville
Length in LA: 282 mi

Source: http://www.us-highways.com/