Two interstate highways run through Montgomery. Interstate 65 is the primary north–south freeway through the city leading between Birmingham and Huntsville to the north and Mobile to the south. Montgomery is the southern terminus of Interstate 85, another north–south freeway (though running east–west in the city), which leads northeast to Atlanta. The major surface street thoroughfare is a loop consisting of State Route 152 in the north, U.S. Highway 231 and U.S. Highway 80 in the east, U.S. Highway 82 in the south, and U.S. Highway 31 along the west of the city. The Alabama Department of Transportation is planning the Outer Montgomery Loop to ease traffic congestion in the city. It is planned to connect Interstate 85 near Mt. Meigs to U.S. Highway 80 southwest of the city. Upon completion of the loop, it will carry the I-85 designation while the original I-85 into the city center will be redesignated I-685.