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Interstate 10 (I-10) is the southernmost east-west, coast-to-coast Interstate Highway in the United Statesmarker. It stretches from the Pacific Oceanmarker at State Route 1 (Pacific Coast Highway) in Santa Monicamarker, Californiamarker to Interstate 95 in Jacksonvillemarker, Floridamarker. I-10 intersects with nine of the 10 primary north-south interstates (all except I-85) and also with the major Interstate routes I-17, I-19 and I-20.

Route description


Between its west terminus in Santa Monicamarker, Californiamarker and the East Los Angeles Interchangemarker it is known as the Santa Monica Freeway.The Santa Monica Freewayis also called the "Rosa ParksFreeway" for the segment beginning at the San Diego Freeway (I-405, locally known as "the 405 freeway," or "the 405") and ending at the Harbor Freeway (I-110 / State Route 110, locally known as "the 110 freeway," or "the 110"), however either name can be used when referring to this stretch of road. The segment between the East Los Angelesmarker Interchange and the city of San Bernardinomarker, California (53 miles, or 92 km, long) is known as the San Bernardino Freeway.Other names exist for I-10. For example, a sign near the western terminus of the highway (in Santa Monica, Californiamarker) announces it as the Christopher Columbus Transcontinental Highway.It is known to a considerably lesser degree as the "Veterans Memorial Highway", and it is listed as a Blue Star Memorial Highway.

A stretch in Palm Springsmarker is signed as the "Sonny Bono Memorial Freeway" as a tribute to the late entertainer who served both as mayor and as a United States Congressman.A second stretch a short distance east in Indiomarker is signed as the "Doctor June McCarroll Memorial Freeway".As a nurse with the Southern Pacific Railroadin 1924, Dr. McCarroll was alarmed at the number of head-on traffic collisions on a nearby stretch of then-new U.S.Route 99, today known as State Route 86. She is credited with having a white stripe painted down the middle of Route 99 near Coachella, Californiamarker to separate the two lanes of traffic.


In Arizonamarker, the highway is designated the "Pearl Harbormarker Memorial Highway".The portion through Phoenixmarker is named the "Papago Freeway" and is a vital piece of the regional freeway system.This designation starts at AZ Loop 101, near 99th Avenue, at which point Loop 101 currently terminates, and runs eastward to the interchange southeast of downtown which is the terminus of I-17.

From the southern terminus of Interstate 17 to the junction with AZ 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 I-8's eastern terminus just southeast of Casa Grandemarker, the highway is signed as the "Pearl Harbor Memorial Highway".ADOT also has maps that show it as the Maricopa Freeway, while AAA and other sources show it as the Pima Freeway.The latter's name is used on a stretch of Loop 101 from U.S. 60 to Interstate 17.

Between Interstate 17 in Phoenix and the Interstate 19 interchange in Tucson, I-10 is included in the federally-designated CANAMEX corridor, extending from Mexico City to Edmonton, Alberta.

In Tucson, Arizona, between I-10 mileposts 259 and 260 are interchange ramps connecting I-10 with the northern terminus of Interstate 19 at its km post 100. I-19 leads 100 km south to its termination at the US-Mexico border at Nogales, Arizona (km post 0). Note that distance measurements on Interstate 19 are signed in metric units.

Also in Tucson, 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 [12846]. Plans are also under way to widen I-10 from Maranamarker north to the I-8 interchange at Casa Grande from 4 lanes to 6 lanes starting in the later half of 2007 and continuing into 2008 and 2009.

New Mexico

Interstate 10 in New Mexico follows the former path of U.S.Route 80across the state. Only three cities of significant size are located on the interstate: Lordsburgmarker, Demingmarker, and Las Crucesmarker.

At Lordsburg is the western junction of U.S.Route 70and 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 Gagemarker) or lack any town at all.

At Deming is the western junction of U.S.Route 180, which also forms a concurrency with I-10 all the way to El Paso. One mile north of Deming on US 180 is New Mexico Route 26 which serves as a short cut to north I-25 and Albuquerquemarker.

I-10/US 70/US 180 continue east to Las Cruces which is the southern end of Interstate 25. Also, US 70 leaves Interstate 10, heading northeast to Alamogordomarker.I-10/US 180 then turns south to the Texas state line.


The new IH-10 "Katy Freeway" in Houston, with managed lanes (HOV + EzTag)

In Texasmarker, the speed limit along I-10 from Kerr Countymarker to El Paso Countymarker is 80 mph (129 km/h), the highest in the nation.However, the night time maximum speed limit remains 65 mph (105 km/h).

From the state line with New Mexico to State Highway 20 in west El Pasomarker, I-10 is bordered by frontage roads Desert South for lanes along I-10 East (actually headed south) and Desert North for lanes along I-10 West (headed north).The interstate then has no frontage roads for nine miles (14 km) but regains them east of downtown and retains them to Clintmarker.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.

A small portion of I-10 from Loop 1604 to downtown in San Antoniomarker is known as the Northwest Expressway or the McDermott Freeway, while another portion from downtown to Loop 1604 East is called East Expressway or Jose Lopez Freeway.

In Houstonmarker, from the western suburb of Katymarker to downtown, I-10 is known as the "Katy Freeway."This section was recently widened to as much as 26 lanes (12 mainlanes, 4 lanes of access roads, and 4-6 mid-freeway HOT/HOVlanes, not counting access road turning lanes) and will be one of the widest freeways in the world. The space for said expansion is 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 "Baytownmarker East Freeway" due to a marketing push by Baytown, the easternmost principal city of the Greater Houston Area.

In Beaumontmarker, it is known as IH-10 South, south of Calder Avenue, and IH-10 North, north of Calder Avenue.It is known as IH-10 East from the IH-10 curve to the Neches River, which is Beaumont's and Jefferson County east boundary Line.


In Louisianamarker, an 18.2-mile (29.3 km) stretch of elevated highway between Lafayette and Baton Rouge is known as the Atchafalaya Swamp Freeway, as it goes over the Atchafalaya River and the adjacent swamps and crosses the Mississippi River at the Horace Wilkinson Bridgemarker.In Baton Rouge, Interstate 12 splits off to head north of Lake Pontchartrainmarker and bypass Interstate 10's long southward jog through New Orleans and reconnects with Interstate 10 at Slidell.In New Orleansmarker, a stretch of I-10 from the I-10/I-610 split near the Orleans-Jefferson parish line to the U.S.Route 90/ U.S.Route 90 Businessinterchange is known as the Pontchartrain Expressway. A dip near the 10-610 interchange to go underneath a railroad track is one of the lowest points in New Orleansmarker, and is highly susceptible to flooding.Pictures of water dozens of feet deep during Hurricane Katrinaare commonplace. Near Slidellmarker, the final stretch of I-10 through the Mississippimarker 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 Orleansmarker.I-610 is a shortcut from the eastern to western portion of New Orleans avoiding I-10's detour into New Orleans' Central Business Districtmarker.


Interstate 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 Gulfportmarker and Biloximarker while passing just north of Pascagoulamarker and Bay St. Louis.The highway roughly parallels U.S.Route 90.

The law defining the route of Interstate 10 is Mississippi Code ยง 65-3-3.


I-10 crosses from Jackson County, Mississippimarker and goes through Mobile Countymarker in Southwest Alabama.In Mobilemarker, the highway is the southern terminus for Interstate 65.In downtown Mobile, I-10 goes through one of the few road tunnels in Alabama, the George C.markerWallace Tunnelmarker under the Mobile River.The eastbound approach is posted at 40 mph (60 km/h) because of the sharp curve approaching the tunnel. The highway then crosses approximately eight miles of the upper part of Mobile Baymarker on a bridge locals refer to as the Bayway.On the other side of Mobile Bay, the highway goes through the suburban "Eastern Shore" area of Baldwin County before passing through Malbis, Loxleymarker and on to the Perdido Rivermarker to cross into Floridamarker.


Most of Interstate 10 in Florida travels through some of the least-populated areas in the state. Consequently, much of I-10 west of Interstate 295 in Jacksonvillemarker has only 4 lanes.In Pensacolamarker, an approximately stretch of I-10 was widened to 6 lanes in 2008.In Tallahassee, construction will be complete in June 2009 on a project to widen an approximately mile stretch of I-10 to six lanes.

In Jacksonvillemarker, as in Arizona, I-10 is known as Pearl Harbor Memorial Highway.Throughout much of Florida, Interstate 10 is also known as State Road 8 or State Road 8A, though it is not signed as such.


In September 2004, Hurricane Ivan's storm surge pushed up and washed out part of I-10 at the causeway over Escambia Bay near Pensacolamarker, Floridamarker.Westbound lanes had only a couple of sections missing, while eastbound lanes were almost completely gone for a quarter-mile (400m).

In the aftermath of Hurricane Katrina, the I-10 Twin Span Bridgemarker, a portion of I-10 between New Orleansmarker and Slidellmarker spanning the eastern end of Lake Pontchartrainmarker, was severely damaged, causing a break in I-10 at that point.Unlike the Escambia Bay Bridge (east of Pensacolamarker, Floridamarker and damaged by Hurricane Ivan) which is a major artery, Interstate 12 is available to bypass New Orleans and taking I-12 to the Lake Ponchartrain Causewaymarker allowed entry and exit to and from the Greater New Orleans area from the East.On October 14, 2005 at 3:00 PM, the eastbound span was reopened to two way traffic. On January 6, 2006 at 6:00 AM, both lanes of the westbound span were reopened to traffic using temporary metal trusses and road panels to replace damaged sections. [12847]This restored all four lanes of the I-10 twin spans for normal traffic with a 45 mph (70 km/h) speed limit for the westbound lanes and 60 mph (100 km/h) for the eastbound lanes. Oversized and overweight traffic is prohibited until a new permanent six lane span is built to replace the two temporarily repaired spans. Construction is underway, with the new westbound span opening in 2009 and the new eastbound span opening in 2011.


A three-year construction project is currently underway on Interstate 10 between Causeway Boulevard and the 17th Street Canal in Metairiemarker, Louisianamarker.The $68.9 million project will add new lanes in both directions and improve the exit and entrance ramps at Causeway and Bonnabel Blvd. The state has recently completed a widening project between Causeway and Clearview Pkwy and between the I-10/I-610 split and Airline Highway (US 61).

A 950 day project is set to begin at the end of 2008 between the I-10 / I-12 split (Exit 159) in Baton Rouge, LA to Siegen Lane (Exit 163) in Baton Rouge, LA. This will widen the road by an additional lane in each direction.

Florida and Alabama are currently planning a possible connector that would link Dothan, Alabamamarker with I-10.Initial plans are calling for making this new highway a toll road, and could be a reality within 5 years As of May 2008, it is unknown what number this new road will be assigned.

Major intersections

Auxiliary routes



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