Standard route signage used for Interstate 25 and Business Loop 40 in New Mexico | |
 Interstate Highways highlighted in red | |
| Highway names | |
|---|---|
| Interstates | Interstate XX (I-XX) |
| US Highways | U.S. Route XX (US XX) |
| State | State Road XX (NM XX) |
| System links | |
| |
| Number | Length (mi) [1] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
 I-10 | 164.26 | 264.35 | I-10 at the Arizona state line | I-10 at the Texas state line | 1957 | current | Replaced nearly all of US 80 | |
 I-25 | 462.12 | 743.71 | I-10 at Las Cruces | I-25 at the Colorado state line | 1957 | current | Longest interstate in New Mexico. Replaced and runs along unsigned US 85 in its entire length in the state. Also part of the CanAm Highway | |
 I-27 | — | — | Texas state line | I-25 near Raton | proposed [2] | — | Proposed as part of the Ports to Plains Corridor | |
 I-40 | 373.51 | 601.11 | I-40 at the Arizona state line | I-40 at the Texas state line | 1957 | current | Replacement of historic Route 66 | |
| Number | Length (mi) [3] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
 I-10 BL | 4.370 | 7.033 | I-10 in Lordsburg | I-10 in Lordsburg | — | — | ||
| I-10 BL | 4.458 | 7.174 | I-10 in Deming | I-10 in Deming | — | — | ||
 I-25 BL | 5.711 | 9.191 | I-25 in Williamsburg | I-25 in Truth or Consequences | — | — | Once concurrent with US 85 before it was realigned to I-25. | |
| I-25 BL | 2.879 | 4.633 | I-25 in Socorro | I-25 in Socorro | — | — | ||
| I-25 BL | 6.645 | 10.694 | I-25 in Belen | I-25 in Belen | — | — | ||
| I-25 BL | 9.370 | 15.080 | I-25 in Santa Fe | I-25 in Santa Fe | — | — | ||
| I-25 BL | 4.240 | 6.824 | I-25 in Las Vegas | I-25 in Las Vegas | — | — | Runs concurrent with unsigned US 85 in its entire length. Part of CanAm Highway | |
| I-25 BL | 3.430 | 5.520 | I-25 near Springer | I-25 near Springer | — | — | Unsigned. Some maps display the route's shields | |
| I-25 BL | 4.161 | 6.696 | I-25 in Raton | I-25 near Raton | — | — | ||
 I-40 BL | — | — | I-40 in Gallup | I-40 in Gallup | — | — | Ran along US 66 | |
| I-40 BL | — | — | I-40 in Milan | I-40 in Grants | — | — | ||
| I-40 BL | — | — | I-40 in Albuquerque | I-40 in Albuquerque | — | — | Ran concurrent with former US 66 | |
| I-40 BL | 2.922 | 4.703 | I-40 in Moriarty | I-40 in Moriarty | — | — | Runs concurrent with former US 66 | |
| I-40 BL | 4.367 | 7.028 | I-40 in Santa Rosa | I-40 in Santa Rosa | — | — | Runs concurrent with US 84 in its entire length | |
| I-40 BL | 7.652 | 12.315 | I-40 in Tucumcari | I-40 in Tucumcari | — | — | Runs concurrent with former US 66 | |
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The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
The United States Numbered Highway System is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these highways were coordinated among the states, they are sometimes called Federal Highways, but the roadways were built and have always been maintained by state or local governments since their initial designation in 1926.
Interstate 25 (I-25), also known as the Pan-American Freeway, is a major Interstate Highway in the western United States. It is primarily a north–south highway, serving as the main route through New Mexico, Colorado, and Wyoming. I-25 stretches from I-10 at Las Cruces, New Mexico to I-90 in Buffalo, Wyoming. It passes through or near Albuquerque, New Mexico; Pueblo, Colorado; Colorado Springs, Colorado; Denver, Colorado; Fort Collins, Colorado; and Cheyenne, Wyoming. The I-25 corridor is mainly rural, especially in Wyoming, excluding the Albuquerque metropolitan area and the Front Range urban corridor from Pueblo to Cheyenne.
U.S. Route 66 or U.S. Highway 66 was one of the original highways in the United States Numbered Highway System. It was established on November 11, 1926, with road signs erected the following year. The highway, which became one of the most famous roads in the United States, ran from Chicago, Illinois, through Missouri, Kansas, Oklahoma, Texas, New Mexico, and Arizona before terminating in Santa Monica in Los Angeles County, California, covering a total of 2,448 miles (3,940 km).
Interstate 27 (I-27) is an Interstate Highway, entirely in the US state of Texas, running north from Lubbock to I-40 in Amarillo. These two cities are the only control cities on I-27; other cities and towns served by I-27 include New Deal, Abernathy, Hale Center, Plainview, Kress, Tulia, Happy, and Canyon. In Amarillo, I-27 is commonly known as the Canyon Expressway, although it is also called Canyon Drive on its access roads. I-27 was officially designated the Marshall Formby Memorial Highway after former attorney and State Senator Marshall Formby in 2005. The entire length of I-27 replaced US Highway 87 (US 87) for through traffic. An extension of I-27 north to Raton, New Mexico, and south to Laredo, Texas, was approved in 2022.
Interstate 40 (I-40) is a major east–west transcontinental Interstate Highway in the southeastern and southwestern portions of the United States. At a length of 2,556.61 miles (4,114.46 km), it is the third-longest Interstate Highway in the country, after I-90 and I-80. From west to east, it passes through California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, and North Carolina. Its western terminus is at I-15 in Barstow, California, while its eastern terminus is at a concurrency with U.S. Route 117 (US 117) and North Carolina Highway 132 (NC 132) in Wilmington, North Carolina. Major cities served by the interstate include Flagstaff, Arizona; Albuquerque, New Mexico; Amarillo, Texas; Oklahoma City, Oklahoma; Little Rock, Arkansas; Memphis, Nashville, and Knoxville in Tennessee; and Asheville, Winston-Salem, Greensboro, Durham, Raleigh, and Wilmington in North Carolina.
Interstate 69 (I-69) is an Interstate Highway in the United States currently consisting of eight unconnected segments. The longest segment runs from Evansville, Indiana, northeast to the Canadian border in Port Huron, Michigan, and includes the original continuous segment from Indianapolis, Indiana, to Port Huron of 355.8 miles (572.6 km). The remaining separated segments are variously completed and posted or not posted sections of an extension southwest to the Mexican border in Texas. Of this extension—nicknamed the NAFTA Superhighway because it would help trade with Canada and Mexico spurred by the North American Free Trade Agreement (NAFTA)—seven pieces in Laredo, Texas; Pharr, Texas; Brownsville, Texas; Corpus Christi, Texas; Houston, Texas; northwestern Mississippi; and Memphis, Tennessee, have been built or upgraded and signposted as I-69. Indiana completed the fifth segment that extends I-69 through that state in August 2024.
U.S. Route 99 (US 99) was a main north–south United States Numbered Highway on the West Coast of the United States until 1964, running from Calexico, California, on the Mexican border to Blaine, Washington, on the Canadian border. It was assigned in 1926 and existed until it was replaced for the most part by Interstate 5. Known also as the "Golden State Highway" and "The Main Street of California", US 99 was important throughout much of the 1930s as a route for Dust Bowl immigrant farm workers to traverse the state. Large portions are now California State Route 99 (SR 99), Oregon's Routes 99, 99W, and 99E, and Washington's SR 99. The highway in Washington connected to British Columbia Highway 99, whose number was derived from that of US 99, at the Canada–US border.
U.S. Highway 87 is a north–south United States highway that runs for 1,998 miles (3,215 km) from northern Montana to southern Texas, making it the longest north-south road to not have a "1" in its number and the third longest north-south road in the country, behind U.S. 41 and U.S. 1. Most of the portion from Billings, Montana to Raton, New Mexico is co-signed along Interstates 90 and 25. It is also co-signed along the majority of I-27 in Texas and future plans call for the interstate to be extended along the US 87 corridor. As of 2004, the highway's northern terminus is in Havre, Montana, at US 2 and its southern terminus is in Port Lavaca, Texas, at SH 238.
U.S. Route 277 is a north–south United States Highway that is a spur route of U.S. Route 77. It no longer connects to its parent route, US 77, although it does intersect another one of its spur. It runs for 633 miles (1,019 km) across Oklahoma and Texas. US 277's northern terminus is in Newcastle, Oklahoma at Interstate 44, which is also the northern terminus of the H.E. Bailey Turnpike. Its southern terminus is in Carrizo Springs, Texas at U.S. Route 83. It passes through the states of Oklahoma and Texas.
Interstate 86 (I-86) is an east–west intrastate Interstate Highway located entirely within the state of Idaho. It runs approximately 63 miles (101 km) from an intersection with I-84 east of Declo in rural Cassia County, to an intersection with I-15 in Chubbuck, just north of Pocatello. The highway is part of the main route from Boise and Twin Falls to Idaho Falls and the upper Snake River region.
Interstate 675 (I-675) is an 11.04-mile-long (17.77 km) auxiliary Interstate Highway in the southeast part of the Atlanta metropolitan area. It travels from I-75 in Stockbridge in the south to I-285 in the north. I-675 is also designated as the Terrell Starr Parkway and also has the unsigned internal state route designation of State Route 413 (SR 413).
State Highway 349 is a 194.43-mile-long (312.90 km) state highway in the western part of Texas, United States.
U.S. Highway 83 (US 83), dedicated as the Texas Vietnam Veterans Memorial Highway, is a U.S. Highway in the U.S. state of Texas that begins at US 77 in Brownsville and follows the Rio Grande to Laredo, then heads north through Abilene to the Oklahoma state line north of Perryton, the seat of Ochiltree County.
In the U.S. state of Texas, U.S. Highway 87 is a north–south U.S. Highway that begins near the Gulf Coast in Port Lavaca, Texas and heads north through San Antonio, Lubbock, Amarillo, and Dalhart to the New Mexico state line near Texline.
Interstate 40 (I-40) is an east–west Interstate Highway that has a 359.11-mile (577.93 km) section in the US state of Arizona, connecting sections in California and New Mexico. The Interstate is also referred to as the Purple Heart Trail to honor those wounded in combat who have received the Purple Heart. It enters Arizona from the west at a crossing of the Colorado River southwest of Kingman. It travels eastward across the northern portion of the state, connecting the cities of Kingman, Ash Fork, Williams, Flagstaff, Winslow, and Holbrook. I-40 continues into New Mexico, heading to Albuquerque. The highway has major junctions with U.S. Route 93 in Kingman and again approximately 22 miles (35 km) to the east and I-17 in Flagstaff.
The Ports to Plains Corridor, also known as National Highway System High Priority Corridor 38, is a highway corridor between the United States Mexico border at Laredo, Texas and Denver, Colorado. It is the southern third of the Ports-to-Plains Alliance. The reason for proposed improvements to this corridor is to expedite the transportation of goods and services from Mexico in the United States and vice versa. The proposed improvements gained momentum with the signing of the FY22 Omnibus Appropriations bill, which designated a section of the highway part of the interstate system. The Ports-To-Plains Corridor starts in South Texas and traverses through Texas, New Mexico, Oklahoma, and ends in Denver, Colorado.
Interstate 2 (I-2) is a partially completed Interstate Highway running through the Lower Rio Grande Valley of South Texas. It begins at the intersection of US Highway 83 (US 83) and Business US 83 in Peñitas and heads eastward before terminating at I-69E/US 77/US 83 in Harlingen. A westward extension around La Joya has been completed, and is designated as I-2 East. For almost its entire length, I-2 runs concurrently with US 83. I-2 also parallels Mexican Federal Highway 2 (Fed. 2), another major east–west route that traces the Mexico–US border along the Mexican side of the Rio Grande. When completed, the western terminus will be the city of Laredo. The route is one of the more recently designated Interstate Highways; it was signed as an Interstate in 2013. Its construction is part of an expansion of the Interstate System into southern Texas that includes the three branches of I-69. It currently intersects I-69E and I-69C and will, when completed to Laredo, terminate I-69W as well. This complex of Interstate Highways does not yet connect to the rest of the system.
