|Length:||2,460.34 mi (3,959.53 km)|
|Existed:||1957 – present|
|West end:||SR 1 in Santa Monica, CA|
|I‑75 near Lake City, FL|
|East end:||I‑95 in Jacksonville, FL|
Interstate 10 (I-10) is the southernmost transcontinental highway in the American Interstate Highway System. It stretches from the Pacific Ocean at State Route 1 (SR 1) (Pacific Coast Highway) in Santa Monica, California to I-95 in Jacksonville, Florida. This freeway is part of the originally planned Interstate Highway network that was laid out in 1956, and its last section was completed in 1990. I-10 is the fourth longest Interstate Highway in the United States, following I-90, I-80, and I-40, with about 1⁄3 of its length within the state of Texas, where the freeway spans the state at its widest breadth.
Between its west terminus in Santa Monica, California, and the major East Los Angeles Interchange it is known as the Santa Monica Freeway. The Santa Monica Freeway is also called the "Rosa Parks Freeway" for the segment beginning at I-405 (the San Diego Freeway), and ending at I-110 / SR 110 (the Harbor Freeway). The segment between the East Los Angeles, CA Interchange and the city of San Bernardino, CA, 63 miles (101 km) long, is called the San Bernardino Freeway. Other names exist for I-10. For example, a sign near the western terminus of the highway in Santa Monica, California proclaims this highway the "Christopher Columbus Transcontinental Highway".
I-10 is known to a considerably lesser degree as the "Veterans Memorial Highway", and it is listed as a Blue Star Memorial Highway. In Palm Springs, CA, I-10 is also named the Sonny Bono Memorial Freeway as a tribute to the late entertainer who served both as the mayor and as a U.S. Congressman. Another stretch a short distance east in Indio, CA is proclaimed the Doctor June McCarroll Memorial Freeway.
In Arizona, the highway is designated the Pearl Harbor Memorial Highway. The portion through Phoenix, Arizona is named the Papago Freeway, and it is a vital piece of the metropolitan Phoenix freeway system. This designation starts at Loop 101, near 99th Avenue, and it continues eastward to the interchange southeast of downtown which is the terminus of I-17.
From the southern terminus of I-17 to the junction with Loop 202, the highway is signed as the Maricopa Freeway. This name holds true as well for I-17 from its southern terminus to its second junction with I-10, north of McDowell Road. From Loop 202 south to the eastern terminus of I-8 just southeast of Casa Grande, AZ, the highway is declared the "Pearl Harbor Memorial Highway". The Arizona Department of Transportation also has maps that show it as the Maricopa Freeway, while the American Automobile Assocatiation and other sources show it as the Pima Freeway. The latter's name is used on a stretch of Loop 101 from Loop 202 to I-17.
In Tucson, Arizona, between I-10 mileposts 259 and 260 are interchange ramps connecting I-10 with the northern terminus of I-19.
The highest elevation along I-10 occurs just east of Tucson, 20 miles (32 km) west of Wilcox, at the mile marker 320 exit for the Amerind Foundation and Museum. The westbound lanes of I-10 briefly cross above 5,000 feet (1,500 m) above sea level.
I-10 in New Mexico more or less follows the former path of U.S. Route 80 (US 80) across the state, although major portions of old US 80 were bypassed in Western New Mexico's Bootheel and in Doña Ana County. I-10 passes through three Southern New Mexico municipalities of regional significance before the junction with I-25: Lordsburg, Deming, and Las Cruces. Most of I-10 in New Mexico, between Exit 24 and Exit 135, is concurrent with US 70.
At Lordsburg is the western junction of US 70 and a concurrency; the two highways are joined all the way to Las Cruces. Several exits between Lordsburg and Deming are either for former towns (including Separ, Quincy, and Gage) or lack any town at all.
At Deming is the western junction of US 180, which also forms a concurrency with I-10 all the way to El Paso. 1 mile (1.6 km) north of Deming on US 180 is New Mexico State Road 26 (NM 26) which serves as a short cut to north I-25 and Albuquerque.
I-10 / US 70 / US 180 continue east to Las Cruces which is the southern end of I-25. US 70 leaves I-10 (prior to the junction with I-25), heading northeast to Alamogordo, passing through the north side of Las Cruces. The junction with I-25 occurs just south of the New Mexico State University campus, on the southern end of Las Cruces. I-10 / US 180 becomes concurrent with US 85 at the junction with I-25. I-10 / US 85 / US 180 then turns south to the Texas state line, crossing it at Anthony.
From the state line with New Mexico (at Anthony) to State Highway 20 (SH 20) in west El Paso, I-10 is bordered by frontage roads South Desert for lanes along I-10 East (actually headed south) and North Desert for lanes along I-10 West (headed north). The interstate then has no frontage roads for 9 miles (14 km) but regains them east of downtown and retains them to Clint. In this stretch, the frontage roads are Gateway East for the eastbound lanes and Gateway West for the westbound lanes. All four frontage roads are one-way streets. Gateway East and Gateway West are notable, in particular, for TxDOT's liberal usage of the Texas U-turn at most underpasses of I-10 on this stretch.
A small portion of I-10 from Loop 1604 to Downtown San Antonio is known as the Northwest Expressway or the McDermott Freeway, while another portion from downtown to Loop 1604 East is called East Expressway or José López Freeway.
In Houston, from the western suburb of Katy to downtown, I-10 is known as the Katy Freeway. This section has as many as 26 lanes (12 mainlanes, eight lanes of access roads, and six mid-freeway HOT/HOV lanes, not counting access road turning lanes) and is one of the widest freeways in the world. The space for the expansion was the right-of-way of the old Missouri-Kansas-Texas Railroad. The section east of downtown Houston is officially known as the East Freeway, although it is widely known by locals as the Baytown East Freeway due to a marketing push by Baytown, one of the largest cities in the Greater Houston Area.
In Beaumont, it is known as I-10 South, south of Calder Avenue, and I-10 North, north of Calder Avenue. It is known as I-10 East from the I-10 curve to the Neches River, which is Beaumont's and Jefferson County's eastern boundary line. Orange County is on the other side.
In Louisiana, an 18-mile (29 km) stretch of elevated highway between Lafayette and Baton Rouge is known as the Atchafalaya Swamp Freeway, as it goes over the Atchafalaya River, across the Atchafalaya Basin Bridge, and the adjacent swamps. It crosses the Mississippi River at the Horace Wilkinson Bridge. In Lake Charles, a 13-mile (21 km) loop route signed as I-210 branches off of I-10 and goes through the southern portion of the city. I-12 links Baton Rouge to Slidell and bypasses I-10's southward jog through New Orleans by remaining north of Lake Pontchartrain. In New Orleans, a stretch of I-10 from the I-10 / I-610 Junction near the Orleans-Jefferson parish line to the US 90 / U.S. Route 90 Business (US 90 Bus)Junction is known as the Pontchartrain Expressway. A dip near the I-10 / I-610 Junction to travel under a railroad track is one of the lowest points in New Orleans, and is highly susceptible to flooding. Pictures of water dozens of feet deep during Hurricane Katrina are commonplace. Near Slidell, the final stretch of I-10 through the Mississippi state line is known as the Stephen Ambrose Memorial Highway.
I-310 and I-510 are parts of what was slated to be I-410 and act as a southern bypass of New Orleans. I-610 is a shortcut from the eastern to western portion of New Orleans avoiding I-10's detour into New Orleans' Central Business District.
I-10 in Mississippi runs from the Louisiana state line to the Alabama state line through Hancock, Harrison and Jackson counties on the Gulf Coast. It passes through the northern sections of Gulfport and Biloxi while passing just north of Pascagoula and Bay St. Louis. It also passes right south of the Stennis Space Center. The highway roughly parallels US 90.
The law defining the route of I-10 is Mississippi Code § 65-3-3.
I-10 crosses over the border from Jackson County, Mississippi, and it goes through Mobile County in southwestern Alabama. In Mobile, I-10 is the southern terminus of I-65. In downtown Mobile, I-10 goes through one of the few highway tunnels in Alabama, the George Wallace Tunnel under the Mobile River.
The speed limit of the eastbound approach is posted at 40 miles per hour (64 km/h) because of the sharp curve approaching the tunnel. The highway then crosses approximately 8 miles (13 km) of the upper part of Mobile Bay on the Jubilee Parkway, a bridge that local people call the "Bayway". The highway is next to Battleship Parkway. On the other side of Mobile Bay, the highway goes through the suburban area of Baldwin County before passing through Malbis, Loxley, and then on to the Perdido River to cross over it into Florida.
Most of I-10 in Florida travels through some of the least-populated areas in the state. Consequently, much of I-10 west of I-295 in Jacksonville has only four lanes. In Pensacola, a stretch of about 3-mile (4.8 km) long of I-10 was widened to six lanes in 2008. In Tallahassee, construction was completed in June 2009 on a project to widen an about 8-mile (13 km) stretch of I-10 to six lanes.
In Jacksonville, as in Arizona, I-10 is designated as the Pearl Harbor Memorial Highway. Throughout much of Florida, I-10 is also State Road 8 (SR 8), though it is not signed as such. (I-110 in Pensacola, Florida, is known as SR 8A.)
Florida and Alabama are currently planning a possible connector that would link Dothan, Alabama, with I-10. Initial planning is suggesting making this new highway a toll road, and it could be a reality within five years (of when?). As of May 2008, it is unknown which highway number that will be assigned to this new highway.
In Tucson, Arizona, all exits between Prince Road and 22nd Street are being reopened after an extensive, three-year improvement project. I-10 has been being widened from six to eight lanes, and seven bridges and underpasses have been built to deal with congestion. Plans are also under way to widen I-10 from Marana north to the I-8 interchange at Casa Grande from four lanes to six lanes starting in the later half of 2007 and continuing into 2008 and 2009.
Texas formerly shared the highest speed limit in the nation with Utah's test section of I-15. The speed limit along I-10 from Kerr County to El Paso County was raised by the Texas Legislature to 75 miles per hour (121 km/h) in 1999 and to 80 miles per hour (130 km/h) in 2006. However, the nighttime maximum speed limit remained 65 miles per hour (105 km/h) and the daytime truck speed limit was 70 miles per hour (110 km/h). With 70,000 miles (110,000 km) of highway in Texas the 432-mile (695 km) stretch of I-10, and 89 miles (143 km) of I-20, between Monahans and the I-10 interchange at the cusp of the Jeff Davis Mountains, only a small percentage of roads were affected.
On September 1, 2011, night-time speed limits were eliminated and the statutory maximum speed limit in Texas was increased from 80 to 85 miles per hour (137 km/h), although no 85 mph speed zones have yet been established.
- I‑405 in West Los Angeles
- I‑110 southwest of Downtown Los Angeles
- I‑5 at the East Los Angeles Interchange in Los Angeles
- I‑710 in East Los Angeles
- I‑605 in El Monte/Baldwin Park
- I‑15 in Ontario
- I‑215 south of Downtown in San Bernardino
- I‑210 in Redlands
- I‑17 in Phoenix (twice)
- I‑8 in Casa Grande
- I‑19 in Tucson
- New Mexico
- I‑25 in Las Cruces
- US 54 / I-110 in El Paso (Locals refer to this junction as the "Spaghetti Bowl")
- I-20 near Kent
- I-410 in San Antonio (twice: Northwest and Eastside)
- I-35 and I-37 in Downtown San Antonio
- I-45 in Houston
- I-69 in Houston
- I-610 in Houston (twice, Westside and Eastside)
- I‑210 in Lake Charles
- I‑49 in Lafayette
- I‑110 and I‑12 in Baton Rouge
- I‑55 in Laplace
- I‑310 near Kenner
- I‑610 (twice), Future I‑49, and I‑510 in New Orleans
- I‑12 and : I‑59 in Slidell
- I-110 in Biloxi
- I‑65 in Mobile
- I‑110 in Pensacola
- I‑75 in Lake City
- I‑295 at the western beltway interchange in Jacksonville
- I‑95 in Downtown Jacksonville
- Los Angeles, California: I-110, I-210, I-710
- San Bernardino, California: I-210
- El Paso, Texas: I-110
- San Antonio, Texas: I-410
- Houston, Texas: I-610
- Lake Charles, Louisiana: I-210
- Baton Rouge, Louisiana: I-110
- New Orleans, Louisiana: I-310, I-510, I-610, I-910
- Biloxi, Mississippi: I-110
- Pensacola, Florida: I-110
- Federal Highway Administration Route Log and Finder List, Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002
- "Louisiana Interstate Highway Log". Southeastroads.com. 2002-10-31. Retrieved 2011-11-27.
- Florida Department of Transportation, GIS data[dead link]
- Texas Department of Transportation, Schematic Layout: IH 10 Katy Frwy, IH 10 at Bunker Hill Road[dead link]
- "Google Maps". Google Maps. 1970-01-01. Retrieved 2013-01-28.
- Interstate 10 East (Jacksonville / Duval County). AA Roads. February 3, 2005. Last accessed November 21, 2006.
- Project Descriptions[dead link] Florida Department of Transportation, Escambia County. Last accessed November 21, 2006.
- I-10 ::: Project Description[dead link] Moving I-10 Forward. FDOT. Last accessed November 21, 2006.
- District Three Construction[dead link]. FDOT. Updated October 19, 2006. Last accessed November 21, 2006.
- "Dothan to I-10 Connection". Wsfa.com. 2008-01-25. Retrieved 2011-11-27.
-  -Tucson
- - Utah 80 miles per hour (130 km/h) speed limit
- 80 miles per hour (130 km/h) speed limit in Texas.
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