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Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 90 marker
Eisenhower Interstate System sign
Highway shield for Interstate 90 and the Eisenhower Interstate System
Map
Primary Interstate Highways in the 48 contiguous states as of 2022
System information
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate X (I-X)
System links

There are 70 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower numbers in the west and higher numbers in the east; even-numbered Interstates run west–east, with lower numbers in the south and higher numbers in the north. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.

Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico.

Contiguous United States

There are 71 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highways. This number does not include auxiliary Interstate Highways.

NumberLength (mi)[2]Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-246.8075.32BL US 83 in Peñitas, TexasI-69E/US 77/US 83 in Harlingen, Texas02013-01-012013currentUnfinished in Texas; Texas only
I-4132.30212.92I-275 in Tampa, FloridaI-95/SR 400 in Daytona Beach, Florida01959-01-011959currentFlorida only
I-51381.292,222.97Fed. 1/Fed. 1D at Mexican border in San Ysidro, CaliforniaHwy 99 at Canadian border in Blaine, Washington01956-01-011956currentServes three states: California, Oregon, Washington
Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California
I-8348.25560.45Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, CaliforniaI-10 in Casa Grande, Arizona01964-01-011964currentServes two states: California, Arizona
I-102460.343,959.53SR 1 in Santa Monica, CaliforniaI-95/US 17/SR 15/SR 228 in Jacksonville, Florida01957-01-011957currentServes eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida
Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910
I-1153.9086.74US 93 at Arizona state line near Boulder City, NevadaUS 95/SR 157 in Las Vegas, Nevada02017-01-012017currentUnfinished in Nevada; Nevada only; planned in one more: Arizona
I-1285.59137.74I-10 in Baton Rouge, LouisianaI-10/I-59 in Slidell, Louisiana01967-01-011967currentLouisiana only
I-1425.1040.39US 190/US 190 Bus in Copperas Cove, TexasI-35/US 190 in Belton, Texas02017-01-262017currentUnfinished in Texas; Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia
Planned associated routes: I-14N, I-14S, and I-214 in Texas
I-151433.522,307.03I-8/SR 15 in San Diego, CaliforniaHighway 4 at Canadian border in Sweetgrass, Montana01957-01-011957currentUnfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana
Associated routes: I-115, I-215, I-315
I-16166.81268.45I-75/SR 540 in Macon, GeorgiaMontgomery Street in Savannah, Georgia01966-01-011966currentGeorgia only
Associated route: I-516
I-17145.76234.58I-10/US 60 in Phoenix, ArizonaI-40/SR 89A in Flagstaff, Arizona01961-01-011961currentArizona only
I-1963.35101.95I-19 Bus. in Nogales, ArizonaI-10 in Tucson, Arizona01972-01-011972currentArizona only
Uses kilometers instead of miles
I-201539.382,477.39I-10 in Reeves County, TexasI-95/I-20 Bus. in Florence, South Carolina01957-01-011957currentServes six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina
Associated routes: I-220, I-520, I-820
I-22202.22325.44I-269/US 78/MS 304 near Byhalia, MississippiI-65 in Birmingham, Alabama02012-01-012012currentUnfinished in Alabama; serves two states: Mississippi, Alabama
Planned associated routes: I-222 and I-422 in Alabama
I-24316.36509.13I-57 in Pulley's Mill, IllinoisI-75 in Chattanooga, Tennessee01962-01-011962currentServes four states: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
I-251061.671,708.59I-10/US 85/US 180 in Las Cruces, New MexicoI-90/US 87 in Buffalo, Wyoming01957-01-011957currentServes three states: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26304.64490.27US 11W/US 23/SR 137 in Kingsport, TennesseeUS 17 in Charleston, South Carolina01960-01-011960currentUnfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
I-27124.13199.77US 87/Loop 289 in Lubbock, TexasI-40/US 87/US 287/US 60 in Amarillo, Texas01969-01-011969currentUnfinished in Texas; Texas only; planned in one more: New Mexico
I-29755.511,215.88I-35/I-70/US 24/US 40/US 71 in Kansas City, MissouriUS 81 and PTH 75 at Canadian border in Pembina, North Dakota01958-01-011958currentServes four states: Missouri, Iowa, South Dakota, North Dakota
Associated routes: I-129, I-229
I-30366.76590.24I-20 in Fort Worth, TexasI-40/US 65/US 67/US 167 in North Little Rock, Arkansas01957-01-011957currentServes two states: Texas, Arkansas
Associated routes: I-430, I-530, I-630
I-31——I-94 in Fargo, North DakotaUS 81 and PTH 75 at Canadian border in Pembina, North Dakota01957-01-01195701958-01-011958Served North Dakota only
Replaced by a northward extension of I-29
I-351568.382,524.06US 83/Victoria Street in Laredo, TexasMN 61/LSCT/26th Avenue in Duluth, Minnesota01956-01-011956currentServes six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota
Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635
I-37143.00230.14US 181 in Corpus Christi, TexasI-35/US 281 in San Antonio, Texas01959-01-011959currentTexas only
I-39306.14492.68I-55 in Normal, IllinoisWIS 29/US 51 in Wausau, Wisconsin01984-01-011984currentServes two states: Illinois, Wisconsin
I-402556.614,114.46I-15 in Barstow, CaliforniaUS 117/NC 132 in Wilmington, North Carolina01964-01-011964currentServes eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina
Associated routes: I-140, I-240, I-440, I-540, I-640, I-840
I-41175.00281.64I-94/US 41 in Russell, IllinoisI-43/US 41/US 141 in Howard, Wisconsin02015-01-012015currentServes two states: Illinois, Wisconsin
I-42190310I-35 in Noble County, OklahomaI-49 in Springdale, Arkansasproposed—Future Interstate; will serve two states: Oklahoma, Arkansas
I-4231.550.7I-40/US 70 in Garner, North CarolinaUS 70 in Goldsboro, North Carolina02024-01-012024currentUnfinished in North Carolina; North Carolina only
I-43191.55308.27I-39/I-90 in Beloit, WisconsinI-41/US 41/US 141 in Howard, Wisconsin01981-01-011981currentWisconsin only
I-44636.691,024.65US 82/US 277/US 281/US 287 in Wichita Falls, TexasI-70 in St. Louis, Missouri01958-01-011958currentServes three states: Texas, Oklahoma, Missouri
Associated routes: I-244, I-344, I-444
I-45284.91458.52SH 87 in Galveston, TexasI-30/US 67/US 75 in Dallas, Texas01971-01-011971currentTexas only
Associated route: I-345
I-49528.02849.77I-10/US 167/LA 182 in Lafayette, LouisianaI-435/I-470/US 50/US 71 in Kansas City, Missouri01984-01-011984currentUnfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas
I-55964.251,551.81I-10 in LaPlace, LouisianaUS 41 in Chicago, Illinois01960-01-011960currentServes six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Associated routes: I-155, I-255, I-355, I-555
I-57386.12621.40I-55 in Miner, MissouriI-94 in Chicago, Illinois01965-01-011965currentUnfinished in Missouri; serves two states: Missouri, Illinois; planned in one more: Arkansas
I-59445.23716.53I-10/I-12 in Slidell, LouisianaI-24 in Wildwood, Georgia01960-01-011960currentServes four states: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
I-64963.521,550.64I-70/US 61 in Wentzville, MissouriI-264/I-664 in Chesapeake, Virginia01961-01-011961currentServes six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia
Associated routes: I-264, I-464, I-564, I-664
I-65887.301,427.97I-10 in Mobile, AlabamaUS 12/US 20 in Gary, Indiana01958-01-011958currentServes four states: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky
I-66——Wichita, KansasNear Pikeville, Kentucky01991-01-01199102015-01-012015[3]Served four states: Kansas, Missouri, Illinois, Kentucky
Associated routes: I-66 Spur in Kentucky
The project was unpopular and ultimately cancelled without the interstate being completed; I-66 Spur eventually became I-165
I-6676.28122.76I-81 in Front Royal, VirginiaUS 29 in Washington, D.C.01961-01-011961currentServes DC and one state: Virginia
I-68113.15182.10I-79 in Morgantown, West VirginiaI-70 in Hancock, Maryland01991-01-011991currentServes two states: West Virginia, Maryland
I-69879.821,415.93US 59 in Rosenberg, TexasHwy 402 at Canadian border in Port Huron, Michigan01957-01-011957currentUnfinished in Texas, Mississippi, Kentucky, and Indiana; serves six states: Texas, Mississippi, Kentucky, Indiana, Michigan. Planned/started in 3 more: Louisiana, Arkansas, Tennessee
Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-569 in Kentucky
I-702172.163,495.75I-15 in Cove Fort, UtahI-695 in Woodlawn, Maryland01956-01-011956currentServes 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland
Associated routes: I-170, I-270, I-370, I-470, I-670
I-71345.57556.14I-64 in Louisville, KentuckyI-90 in Cleveland, Ohio01959-01-011959currentServes two states: Kentucky, Ohio
Associated routes: I-271, I-471
I-72179.29288.54US 61 in Hannibal, MissouriChurch Street and University Avenue in Champaign, Illinois01970-01-011970currentServes two states: Missouri, Illinois
Associated route: I-172
I-7399.43160.02US 220 near Stokesdale, North CarolinaI‑74 and US 220 in Randleman, North Carolina01997-01-011997currentUnfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan
I-74491.74791.38I-80 in Bettendorf, IowaUS 74/NC 41 near Lumberton, North Carolina01974-01-011974currentUnfinished in Ohio and North Carolina; serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina
Associated routes: I-474; Planned: I-274 in North Carolina
I-751786.472,875.04SR 826/SR 916/SR 924 in Miami Lakes, FloridaCanadian border at Sault Ste. Marie, Michigan01958-01-011958currentServes six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I-76186.48300.11I-70 at Denver, ColoradoI-80 at Big Springs, Nebraska01975-01-011975currentServes two states: Colorado, Nebraska
I-76435.66701.13I-71 in Westfield Center, OhioI-295 at Bellmawr, New Jersey01964-01-011964currentServes three states: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676
I-77610.10981.86I-26 in Columbia, South CarolinaI-90 in Cleveland, Ohio01958-01-011958currentServes five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated route: I-277
I-78146.28235.41I-81 at Jonestown, PennsylvaniaCanal Street in New York City01957-01-011957currentServes three states: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478, I-678, I-878
I-79343.46552.75I-77 in Charleston, West VirginiaPA 5 in Erie, Pennsylvania01967-01-011967currentServes two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-802899.594,666.44US 101 in San Francisco, CaliforniaI-95 in Teaneck, New Jersey01956-01-011956currentServes 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey
Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
I-81855.021,376.02I-40 in Dandridge, TennesseeHwy 137 at Canadian border on Wellesley Island, New York01961-01-011961currentServes six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York
Associated routes: I-381, I-481, I-581, I-781
I-82143.58231.07I-90 in Ellensburg, WashingtonI-84 in Hermiston, Oregon01957-01-011957currentServes two states: Washington, Oregon
Associated route: I-182
I-82——I-81/I-84/US 6 in Scranton, PennsylvaniaI-95 in Teaneck, New Jersey01957-01-01195701958-01-011958Served two states: Pennsylvania, New Jersey
Was the initial designation to what is now I-380 and I-80
I-82——I-84 in East Hartford, ConnecticutProvidence, Rhode Island01956-01-01195601968-01-011968Served one state: Connecticut, was planned for one state: Rhode Island
Redesignated as I-84 in 1968
I-8385.03136.84President Street and Fayette Street in Baltimore, MarylandI-81 in Harrisburg, Pennsylvania01959-01-011959currentServes two states: Maryland, Pennsylvania
Associated route: I-283
I-84769.621,238.58I-5 in Portland, OregonI-80 in Echo, Utah01980-01-011980currentServes three states: Oregon, Idaho, Utah
Associated route: I-184
I-84232.71374.51I-81 in Scranton, PennsylvaniaI-90 in Sturbridge, Massachusetts01963-01-011963currentServes four states: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684
I-85666.051,071.90I-65 in Montgomery, AlabamaI-95 in Petersburg, Virginia01958-01-011958currentUnfinished in Alabama; serves five states: Alabama, Georgia, South Carolina, North Carolina, Virginia
Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina
I-8662.85101.15I-84 near Declo, IdahoI-15 in Chubbuck, Idaho01980-01-011980currentIdaho only
I-86223.39359.51I-90 near North East, PennsylvaniaNY 17/NY 79 in Windsor, New York01999-01-011999currentUnfinished in New York; serves two states: Pennsylvania, New York
I-8638.9762.72I-84 in East Hartford, ConnecticutI-90 in Sturbridge, Massachusetts01968-01-01196801984-01-011984Served two states: Connecticut, Massachusetts
Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled
I-8712.9020.76I-440/US 64/US 264 in Raleigh, North CarolinaUS 64/US 264 in Wendell, North Carolina02017-01-012017currentUnfinished in North Carolina; North Carolina only; planned in one more: Virginia
Associated route: I-587
Shortest Interstate highway in contiguous United States
I-87333.49536.70I-278 in New York CityA-15 at Canadian border in Champlain, New York01957-01-011957currentNew York only
Associated routes: I-287, I-587, I-787
I-88140.60226.27I-80/IL 92 in East Moline, IllinoisI-290/IL 110 in Hillside, Illinois01987-01-011987currentIllinois only
I-88117.75189.50I-81 in Binghamton, New YorkI-90 in Schenectady, New York01968-01-011968currentNew York only
I-89191.12307.58I-93/SR 3A in Bow, New HampshireRoute 133/Future A-35 at Canadian border in Highgate, Vermont01960-01-011960currentServes two states: New Hampshire, Vermont
Associated route: I-189
I-903020.444,860.93SR 519/4th Avenue/Edgar Martinez Drive in Seattle, WashingtonMA 1A in Boston, Massachusetts01956-01-011956currentServes 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts
Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990
Longest Interstate highway
I-91290.37467.31I-95/Route 34 in New Haven, ConnecticutA-55 at Canadian border in Derby Line, Vermont01958-01-011958currentServes three states: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691
I-93189.95305.69I-95/US 1 in Canton, MassachusettsI-91 in St. Johnsbury, Vermont01957-01-011957currentServes three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
I-941585.202,551.13I-90 in Lockwood, MontanaHighway 402 at Canadian border in Port Huron, Michigan01956-01-011956currentServes seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan
Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894
I-951919.313,088.83US 1 in Miami, FloridaNB 95 at Canadian border in Houlton, Maine01957-01-011957currentServes DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine
Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895
Longest primary north-south Interstate highway
I-96192.06309.09US 31 in Norton Shores, MichiganI-75 in Detroit, Michigan01959-01-011959currentMichigan only
Associated routes: I-196, I-296, I-496, I-696
I-9717.6228.36US 50/US 301 in Annapolis, MarylandI-695/I-895 in Glen Burnie, Maryland01987-01-011987currentMaryland only
I-9998.34158.26I-70/I-76 in Bedford, PennsylvaniaI-86/NY 17 in Painted Post, New York01998-01-011998currentUnfinished in Pennsylvania; serves two states: Pennsylvania, New York
  •       Former
  •       Proposed and unbuilt

Other regions

In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the mainland routes:

Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway.[4]

Hawaii

Map
Map of Hawaii's Interstate Highways (excluding H-201)

The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.

NumberLength (mi)[2]Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
H-127.1643.71Route 93 in KapoleiRoute 72 in Honolulu01960-01-011960currentAssociated route: H-201
H-28.3313.41H-1 in Pearl CityRoute 99 in Wahiawa01960-01-011960current
H-315.3224.66H-1/H-201 in HalawaMarine Corps Base Hawaii01997-01-011997current

Alaska

Main article: List of Interstate Highways in Alaska
Map
Map of Alaska's Interstate Highways

Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers.[5]

NumberLength (mi)[2]Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
A-1408.23656.98AnchorageCanadian border in Alcan Border01976-01-011976currentGlenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway[6][7][8][9]
A-2202.18325.38TokFairbanks01976-01-011976currentAlaska Highway, Richardson Highway[7][8][9]
A-3148.12238.38AnchorageSoldotna01976-01-011976currentSeward Highway, Sterling Highway[6][8][9]
A-4323.69520.93Gateway, near PalmerFairbanks01976-01-011976currentParks Highway[6][7][8][9]

Puerto Rico

Main article: List of highways in Puerto Rico § Interstates
Map of the Interstates in Puerto Rico

Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.[10]

NumberLength (mi)[2]Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
PR-171.08114.39PR-2 in PoncePR-2 in San Juan01976-01-011976currentFollows PR-52
PR-2138.13222.30PR-1 in PoncePR-3 in San Juan01976-01-011976currentFollows PR-22
PR-340.5665.27PR-3 in HumacaoPR-2 in San Juan01976-01-011976currentFollows PR-66

See also


References

  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Retrieved March 16, 2012.
  2. ^ a b c d "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018". FHWA Route Log and Finder List. Federal Highway Administration. May 6, 2019. Retrieved April 21, 2021.
  3. ^ Nelsen, Carrie (July 9, 2015). "For Immediate Release" (PDF) (Press release). Illinois Department of Transportation. Archived from the original (PDF) on September 6, 2015.
  4. ^ Staff. "FHWA Route Log and Finder List". Federal Highway Administration. Retrieved May 24, 2007.
  5. ^ Voss, Oscar. "Alaska Roads: Interstate ends photos". Retrieved May 24, 2007.
  6. ^ a b c Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.
  7. ^ a b c Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  8. ^ a b c d Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Retrieved May 31, 2012.
  9. ^ a b c d Staff. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). Federal Highway Administration. Retrieved May 31, 2012.
  10. ^ Voss, Oscar. "Puerto Rico road photos". Retrieved May 24, 2007.
source: https://en.wikipedia.org/wiki/List_of_intrastate_Interstate_Highways
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