Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at 2,460.34 miles (3,959.53 km), following I-90, I-80, and I-40. This freeway is part of the originally planned network that was laid out in 1956, and its last section was completed in 1990.
U.S. Route 231 (US 231) is a north-south U.S highway that is a parallel route of US 31. It runs for 912 miles (1,468 km) from St. John, Indiana, at US 41 to south of US 98 in downtown Panama City, Florida. One of its most notable landmarks is the William H. Natcher Bridge, a nearly mile-long cable-stayed bridge that connects Rockport, Indiana, to Owensboro, Kentucky, spanning the Ohio River.
U.S. Route 431 (US 431) is a spur of U.S. Route 31. It currently travels for approximately 556 miles (895 km) from US 231/Alabama State Route 210 and US 231 Business and US 431 Bus. in Dothan, Alabama, to Owensboro, Kentucky, at US 60 and Kentucky Route 2831.
U.S. Route 280 is a spur of U.S. Highway 80. It currently runs for 392 miles (631 km) from Blichton, Georgia at US 80 to Birmingham, Alabama at I-20/I-59. For much of its route, US 280 travels through rural areas and smaller cities in southern Georgia and east central Alabama. Once the highway approaches Birmingham, it is a major suburban route. Numerous shopping centers are located on US 280 throughout northern Shelby County and southern Jefferson County.
State Route 147 is a state highway serving the Las Vegas Valley in southern Nevada. It is signed as Lake Mead Boulevard and runs from Interstate 15 (I-15) and U.S. Route 93 in North Las Vegas east to the border of the Lake Mead National Recreation Area. It is not to be confused with Lake Mead Parkway, which also goes to Lake Mead but mainly runs in southern Las Vegas Valley and carries the designation of State Route 564.
Dixie Highway in Palm Beach and Broward counties carries two segments of the State Road 811 designation by Florida Department of Transportation, as well as the local County Road 811 in southeast Florida. The entire road comprises a section of the Dixie Highway, a National Auto Trail which eventually became a former routing of U.S. Route 1 after the route was shifted east to Federal Highway. One segment of SR 811 is in Broward County and the other is in Palm Beach County, Florida. The segments of SR 811 are supplemented by three shorter segments of CR 811, one of which is unsigned.
U.S. Route 431 (US 431), internally designated by the Alabama Department of Transportation (ALDOT) as State Route 1 (SR 1), is a major north–south state highway across the eastern part of the U.S. state of Alabama. Although US 431's south end is in Dothan, SR 1 continues south for about 13 miles (21 km) along US 231 to the Florida state line.
State Route 53 (SR 53) is a 345.287-mile (555.686 km) state highway in the U.S. state of Alabama. The majority, between Dothan and Huntsville, is signed as U.S. Route 231 (US 231), but the two ends – south to Florida and north to I-65/US 31 near Tennessee – are independent. In those areas, US 231 uses SR 1, sharing the route with US 431 north of Huntsville, where it is referred to as Memorial Parkway.
State Route 21 (SR 21) is a 279-mile (449 km) state highway that extends from the Florida state line, near Atmore in Escambia County to Piedmont in Calhoun County. The route travels almost the entire length of the state from the northeast to the southwest. It is the longest signed state route in Alabama.
State Route 109 (SR 109) is a 9.907-mile-long (15.944 km) state highway in Houston County in the southeastern part of the U.S. state of Alabama. The southern terminus of the highway is at the Florida state line, where it serves as a continuation of State Road 77. The northern terminus of the highway is at an intersection with U.S. Route 231 (US 231) north of Madrid.
State Route 271 is a 6.5-mile-long (10.5 km) route that serves as a connection between U.S. Route 82/U.S. Route 231 and Interstate 85 (I-85) in Montgomery, Alabama.
State Route 144 (SR 144) is a 26.663-mile-long (42.910 km) east–west state highway in the eastern part of the U.S. state of Alabama. It travels from U.S. Route 231 (US 231) in St. Clair County near Pell City to US 431 at Alexandria in Calhoun County. The highway is two lanes for its entire length. The highway also crosses the Coosa River using the bridge across the Neely Henry Dam.
U.S. Route 231 (US 231) in Florida is a north–south United States Highway. It runs 52 miles (84 km) from Panama City north to the Alabama State Line in Bay and Jackson Counties. The entire route is also unsigned State Road 75, and is a four-lane highway throughout the state whether the road is divided or not.
State Route 52 (SR 52) is an 82.805-mile-long (133.262 km) state highway in the southeastern part of the U.S. state of Alabama. The western terminus of the highway is at an intersection with U.S. Route 331 (US 331) at Opp. The eastern terminus of the highway is at the Georgia state line east of Columbia, where the highway crosses over the Chattahoochee River and enter Hilton, Georgia as Georgia State Route 62.
State Route 92 (SR 92) is an 11.019-mile-long (17.733 km) state highway in the southeastern part of the U.S. state of Alabama. The western terminus of the highway is at an intersection with SR 167 southeast of Enterprise. The eastern terminus of the highway is at an intersection with U.S. Route 84 (US 84) in rural Houston County north of the unincorporated community of Wicksburg.
U.S. Route 231 (US 231) in Alabama runs north–south up through the eastern half of Alabama for 306.273 miles (492.899 km). US 231 enters the state from Florida south of Madrid and exits into Tennessee, running councurrently with US 431 north of Hazel Green. US 231 passes through the major cities of Dothan, Troy, Montgomery, and Huntsville.
Several special routes of U.S. Route 231 exist and have existed in the past. In order from south to north, these special routes of U.S. Route 231 (US 231) are as follows.
Four special routes of U.S. Route 431 exist, and three others used to exist, the majority of which have been in Alabama. In order from south to north they are as follows.
State Route 605 (SR 605) is a 23.420-mile-long (37.691 km) state highway in Houston and Dale counties in the southeastern part of the U.S. state of Alabama. The southern terminus of the highway is at an intersection with U.S. Route 231 (US 231) south of Madrid. The northern terminus of the route is at another intersection with US 231 in Midland City.
State Route 134 is an east-west state route located in Covington, Coffee, Dale, Henry, and Houston counties in Alabama. It loosely parallels U.S. Route 84 (US 84) between Opp and the Chattahoochee River.
US 231 
US 84 
US 431 
SR 52 
SR 53 
