List of auxiliary Interstate Highways

Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards (with rare exceptions), they receive the same percentage of federal funding (90%), and they comply with other federal standards.

Dwight D. Eisenhower National System of Interstate and Defense Highways
Highway shield for Interstate 295
Interstate Highways in the 48 contiguous states
System information
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate X (I-X)
System links

Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat them as bypasses.

These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer Interstates may have many such supplemental routes, the numbers may repeat from state to state along their route, but they will not repeat within a state.

Terminology and guidelines

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits usually determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit (5), and this indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 shows that it is a supplement to I-15.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used.

Spur route

A spur route's number usually has an odd number for its first digit.[2] It is usually one of the following:

  • It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street/avenue or at a substandard freeway, such as I-180 in Lincoln, Nebraska.
  • It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
  • It may connect two unrelated Interstate highways—such as I-390 in New York State and I-355 in Illinois do.
    • Note that states differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.

Examples include:

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples include:

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.[2]

Examples include:

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini; however, they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.[2]

Some examples of beltways include:

Auxiliary Interstates

Note: the table sorts the route numbers by parent highway.
Number Length (mi)[3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
H-201 4.106.60 H-1 in Halawa, HIH-1 in Honolulu, HI 02004-01-012004[4]current
I-105 17.3227.87 SR 1 in El Segundo, CAI-605 in Norwalk, CA 01963-01-011963current Replaced segments of SR 42
I-205 12.9720.87 I-580 near Tracy, CAI-5 near Tracy, CA 01970-01-011970current
I-305 6.009.66 I-80 in West Sacramento, CAI-80 Bus/US 50/SR 99 in Sacramento, CA 01981-01-011981current Unsigned
I-405 72.15116.11 I-5 in Irvine, CAI-5 in Mission Hills, CA 01964-01-011964current
I-505 32.9853.08 I-80 in Vacaville, CAI-5 in Dunnigan, CA 01977-01-011977current Originally part of I-5W
I-605 27.4044.10 I-405 in Seal Beach, CAI-210 in Irwindale, CA 01964-01-011964current
I-805 28.0245.09 I-5 in San Ysidro, CAI-5 in Sorrento Valley, CA 01959-01-011959current
I-905 8.96[5]14.42 I-5 in San Ysidro, CAFed. 2 at the United States-Mexico border in Otay Mesa, CA proposed Currently SR 905, proposed to be signed as an Interstate
I-105 3.495.62 OR 99 in Eugene, ORI-5 in Springfield, OR 02011-01-012011current
I-405 3.535.68 I-5 in Portland, ORI-5 in Portland, OR 01969-01-011969current
I-205 36.6458.97 I-5 in Tualatin, ORI-5 in Salmon Creek, WA 01975-01-011975current
I-405 30.3048.76 I-5/SR 518 in Tukwila, WAI-5/SR 525 in Lynnwood, WA 01964-01-011964current
I-605 proposed Proposed to bypass Seattle, WA
I-705 1.502.41 I-5/SR 7 in Tacoma, WA 01990-01-011990current Schuster Parkway in Tacoma
I-210 I-10 in Mobile, AL (original southern terminus)I-65 in Prichard, AL Currently I-165, the route number was decommissioned because it had no connection to I-10
I-410 I-10/I-17 in Phoenix, AZI-10 in Phoenix, AZ Now part of I-10 in Phoenix, AZ
I-510 I-10/SR 51 in Phoenix, AZSR 101 in Phoenix, AZ Currently designated as SR 51 (Piestewa Freeway)
I-710 I-10 in Tucson, AZNorth Campbell Avenue/East 6th Street in Tucson, AZ Mostly never built freeway that was to connect to University of Arizona campus from I-10
I-110 20.4332.88 SR 47 in San Pedro, CAI-10/SR 110 in Los Angeles, CA 01978-01-011978current Originally part of US 66, then signed as SR 11
I-210 48.7278.41 I-5 in Sylmar, CASR 57/SR 210 in Glendora, CA 01964-01-011964current Segment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
I-710 19.6631.64 Terminal Island in Long Beach, CAValley Boulevard in Alhambra, CA 01983-01-011983current Originally signed as SR 7
I-110 6.9411.17 US 98 Bus. near Pensacola, FLI-10 near Pensacola, FL 01969-01-011969current
I-110 8.8914.31 I-10 in Baton Rouge, LAUS 61 in Baton Rouge, LA 01964-01-011964current
I-210 12.4019.96 I-10 west of Lake Charles, LAI-10 east of Lake Charles, LA 01964-01-011964current
I-310 11.2518.11 US 90/LA 3127 in Boutte, LAI-10 west of Kenner, LA 01983-01-011983current
I-310 2.704.35 US 90 Bus. in New Orleans, LAI-10 in New Orleans, LA 01964-01-01196401969-01-011969 Cancelled Vieux Carré Riverfront Expressway
I-410 1.903.06 LA 67 in Baton Rouge, LAI-10 in Baton Rouge, LA 01961-01-01196101964-01-011964 Renumbered as I-110
I-410 I-10 west of New Orleans, LAI-10 in New Orleans, LA 01969-01-01196901977-01-011977 Cancelled southern bypass of New Orleans
I-510 3.044.89 LA 47 in New Orleans, LAI-10/LA 47 in New Orleans, LA 01992-01-011992current
I-610 4.527.27 I-10 at MetairieNew Orleans, LA, lineI-10 in New Orleans, LA 01965-01-011965current
I-910 9.7015.61 US 90 Bus. in Marrero, LAI-10/US 90 Bus. in New Orleans, LA 01999-01-011999current Signed as part of US 90 Bus. and Future I-49
I-110 4.106.60 US 90 in Biloxi, MSI-10 in D'Iberville, MS 01988-01-011988current
I-310 US 90 near the Port of Gulfport, MSI-10 in Gulfport, MS proposed Future spur into Gulfport, MS
I-110 0.921.48 Av Abraham Lincoln at the United States-Mexico border in El Paso, TXI-10 in El Paso, TX 01967-01-011967current Shortest signed Interstate in the country
I-410 49.4979.65 Beltway around San Antonio, TX 01959-01-011959current
I-610 37.9761.11 Beltway around Houston, TX 01975-01-011975current
I-215 54.5087.71 I-15 in Murrieta, CAI-15 in Devore, CA 01982-01-011982current Originally signed as I-15E, then SR 215
I-115 1.191.92 I-15/I-90 in Butte, MTIron Street in Butte, MT 01971-01-011971current
I-315 0.831.34 I-15 in Great Falls, MTI-15 Bus/US 89 in Great Falls, MT 01960-12-161960current Unsigned
I215 11.1017.86 I-15/Clark County Route 215 near Paradise, NVI-515/US 93/SR 564 in Henderson, NV 01996-01-011996current
I515 20.5433.06 US 93/US 95 in Henderson, NVI-15/US 93/US 95 in Las Vegas, NV 01976-01-011976current Not signed until 1994, this route is entirely concurrent with US 93/US 95
I-215 29.0246.70 I-80 in Salt Lake City, UTI-15 in North Salt Lake, UT 01963-01-011963current
I-415 2.393.85 I-80 in Salt Lake City, UT4430 S in Holladay, Utah 01965-01-01196501969-01-011969 Designation was scrapped to provide a single route number 215 for the entire route.
I-516 6.4910.44 SR 21/SR 204 in Savannah, GASR 21 in Garden City, GA 01985-01-011985current
I-420 5.408.69 I-285 in College Park, GAI-20 in Atlanta, GA 01983-01-01198301986-01-011986 Never built, was planned to bypass Atlanta, GA
I-520 16.1425.97 I-20 in Augusta, GAI-20 in North Augusta, SC 01980-01-011980current
I-220 17.6228.36 I-20/LA 3132 in Shreveport, LAI-20 in Bossier City, LA 01979-01-011979current
I-420 10.2016.42 I-20 in West Monroe, LAI-20 in Monroe, LA 01957-01-01195701964-01-011964 Cancelled bypass of Monroe
I-220 12.0119.33 I-20 in Jackson, MSI-55 in Ridgeland, MS 01981-01-011981current
I-820 35.1756.60 I-20 in Fort Worth, TXI-20/US 287 in Fort Worth, TX 01959-01-011959current
I-222 I-22 near Birmingham, ALI-422 near Birmingham, AL proposed
I-422 I-20/I-59/I-459/US 11 in Bessemer, ALI-59 in Argo, AL proposed If built, it will have no direct connections to I-22.
I-124 1.973.17 I-24 in Chattanooga, TNUS 27 in Chattanooga, TN 01960-01-011960current Unsigned
I-225 12.0019.31 I-25 in Denver, COI-70 in Aurora, CO 01976-01-011976current
I-126 3.685.92 I-26 in Columbia, SCUS 21/US 76/US 176/US 321 in Columbia, SC 01961-01-011961current
I-326 5.248.43 I-26 in Cayce, SCSC 48 in Columbia, SC 01976-01-01197601995-01-011995 Now part of I-77, formerly unsigned
I-526 19.2631.00 US 17 in Charleston, SCI-526 Bus./US 17 in Mount Pleasant, SC 01989-01-011989current
I-129 3.485.60 US 20/US 75/US 77 in South Sioux City, NEI-29/US 20/US 75 in Sioux City, IA 01976-01-011976current
I-229 14.9724.09 I-29 in St. Joseph, MOI-29/US 59/US 71 in St. Joseph, MO 01986-01-011986current
I-229 11.3318.23 I-29 in Sioux Falls, SDI-90 near Sioux Falls, SD 01966-01-011966current
I-130 58 I-30/I-49 in Texarkana, ARUS 59/US 71 near Texarkana, AR 02000-01-01200002014-01-012014 Now part of I-49
I-430 12.9320.81 I-30/US 67 in Little Rock, ARI-40/US 65 in Little Rock, AR 01980-01-011980current
I-530 46.6575.08 US 65 in Pine Bluff, ARI-30/I-440 in Little Rock, AR 01999-01-011999current
I-630 7.4011.91 I-430 near Little Rock, ARI-30 in Little Rock, AR 01985-01-011985current
I-235 13.7822.18 I-35/I-80 in West Des Moines, IAI-35/I-80 near Des Moines, IA 01961-01-011961current
I-135 95.74154.08 Kansas Turnpike/I-35 in Wichita, KSI-70/US 81 in Salina, KS 01976-01-011976current
I-235 16.5226.59 I-135/US 81 in Wichita, KSI-135/US 81/K-15/K-254 in Wichita, KS 01965-01-011965current
I-335 50.1380.68 I-35/Kansas Turnpike/US 50 in Emporia, KSI-470/Kansas Turnpike in Topeka, KS 01987-01-011987current
I-435 80.81130.05 Beltway around Kansas City, KS, and Kansas City, MO 01965-01-011965current
I-635 8.9014.32 I-35 in Overland Park, KSI-29/US 71 in Kansas City, MO 01968-01-011968current
I-335 2.74[6]4.41 I-94 in Minneapolis, MNI-35W in Minneapolis, MN 01964-01-01196401978-01-011978 Cancelled
I-535 2.784.47 I-35/US 53 in Duluth, MNUS 53/WIS 35 in Superior, WI 01971-01-011971current
I-235 5.368.63 I-35/I-40 in Oklahoma City, OKI-44 in Oklahoma City, OK 01989-01-011989current
I-635 37.0059.55 SH 121 in Grapevine, TXI-20 in Balch Springs, TX 01959-01-011959current
I-238 2.233.59 I-880 in San Leandro, CAI-580/SR 238 in Castro Valley, CA 01983-01-011983current Considered an auxiliary route of I-80 in California; there is no I-38
I-440 9.9616.03 I-30/I-530 near Little Rock, ARI-40/AR 440 near Little Rock, AR 02003-01-012003current
I-540 15.8725.54 US 271/AR 253 near Fort Smith, ARI-40 in Van Buren, AR 01965-01-011965current
I-140 6.7910.93 US 17 near Winnabow, NCI-40/US 17 in Wilmington, NC 02008-01-012008current
I-240 9.5415.35 I-26/I-40/US 74 near Asheville, NCI-40/US 74A in Asheville, NC 01980-01-011980current
I-440 16.7726.99 I-40/US 1/US 64 near Cary, NCI-40 near Raleigh, NC 01991-01-011991current
I-540 25.8441.59 I-40 near Durham, NCI-87/US 64/US 264 near Knightdale, NC 01997-01-011997current
I-840 5.779.29 I-40/I-73/US 421 in Greensboro, NCI-40/I-85/I-785/I-85 Bus. in Greensboro, NC 02011-01-012011current
I-240 16.2226.10 I-44/US 62 in Oklahoma City, OKI-40/US 270 in Oklahoma City, OK 01965-01-011965current
I-440 9.9616.03 I-40/I-240 near Oklahoma, OKI-35 in Oklahoma City, OK 01975-01-011975 Now part of I-44
I-140 11.1717.98 I-40 near Farragut, TNUS 129 near Alcoa, TN 01987-01-011987current
I-240 19.2731.01 I-40 in Memphis, TNI-40 in Memphis, TN 01970-01-011970current
I-440 7.6412.30 I-40 in Nashville, TNI-24 in Nashville, TN 01987-01-011987current
I-640 7.0311.31 I-40 in Knoxville, TNI-40 in Knoxville, TN 01982-01-011982current
I-840 77.28[7]124.37 I-40 near Dickson, TNI-40 near Lebanon, TN 02016-01-012016current
I-244 15.7525.35 I-44 in Tulsa, OKI-44 in Tulsa, OK 01970-01-011970current
I-444 2.514.04 I-244 in Tulsa, OKI-244 in Tulsa, OK 01970-01-011970current Unsigned
I-345 1.402.25 I-30/I-45 in Dallas, TXUS 75 in Dallas, TX 01973-01-011973current Unsigned
I-555 49.8080.15 I-55 in Turrell, ARAR 91 in Jonesboro, AR 02016-01-012016current
I-155 32.1351.71 I-74 in Morton, ILI-55 in Lincoln, IL 01992-01-011992current
I-255 30.8249.60 I-55/I-270 in Mehlville, MOI-270/IL 255 in Pontoon Beach, IL 01986-01-011986current
I-355 32.5152.32 I-80 in New Lenox, ILI-290 in Itasca, IL 01989-01-011989current
I-155 15.9325.64 I-55 near Hayti, MOUS 51 at Dyersburg, TN 01980-01-011980current
I-255 I-55/I-240 in Memphis, TNI-40 in Memphis, TN Now part of I-55 and I-240
I-359 2.303.70 I-20/I-59 in southern Tuscaloosa, AL15th Street in downtown Tuscaloosa, AL 01983-01-011983current
I-459 32.8052.79 I-20/I-59 in Bessemer, ALI-59 in Trussville, AL 01984-01-011984current
I-759 4.507.24 I-59 in Attalla, ALUS 411/SR 759 in Gadsden, AL 01986-01-011986current
I-164 21.39[8]34.42 US 41/Veterans Memorial Parkway in Evansville, INI-69 in Evansville, IN 01990-01-01199002014-01-012014 Decommissioned; now part of I-69[9]
I-264 22.9336.90 I-64 in Louisville, KYI-71 in Louisville, KY 01956-01-011956current
I-264 25.0740.35 I-64/I-664 in Chesapeake, VAParks Ave in Virginia Beach, VA 01960-01-011960current
I-464 4.717.58 I-64 in Chesapeake, VAI-264 in Norfolk, VA 01960-01-011960current
I-564 3.034.88 SR 337I-64 in Norfolk, VA 01970-01-011970current
I-664 20.2132.52 I-64/I-264 in Norfolk, VAI-64 in Hampton, VA 01971-01-011971current
I-165 4.907.89 US 43 in Mobile, ALI-65 in Mobile, AL 01994-01-011994current
I-565 21.4034.44 I-65/US 72/SR 20 in Decatur, ALUS 72 in Huntsville, AL 01991-01-011991current
I-165 2.704.35 I-65/I-70 in Indianapolis, IN38th Street in Indianapolis, IN 01978-01-01197801981-01-011981 Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
I-265 6.7310.83 I-64 in New Albany, INSR 62/SR 265 in Clarksville, IN 01977-01-011977current Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
I-465 52.7984.96 Beltway around Indianapolis 01970-01-011970current
I-865 4.727.60 I-65 near Indianapolis, INI-465 near Indianapolis 02002-01-012002current
I-265 24.4839.40 I-65/KY 841 in Heritage Creek, KYI-71/KY 841 in Prospect, KY 01977-01-011977current Connected with I-265 in Indiana on December 18, 2016, with the completion of the East End Bridge
I-265 23 I-40 in Nashville, TNI-65 in Nashville, TN 02000-01-012000 Now part of I-65
I-165 69.684112.146 I-65 in Bowling Green, KYUS 60/US 231 in Owensboro, KY 02019-01-012019current Replaced the William H. Natcher Parkway
I-266 1.792.88 01972-01-011972 Proposed loop route of I-66 between the District, and Arlington County; if built, would have been the only auxiliary route of I-66; cancelled in the face of community opposition during Washington's freeway revolts
I-169 34.2755.15 I-24 near Hopkinsville, KYI-69 in Nortonville, KY 02017-05-072017current New designation along the former Pennyrile Parkway
I-369 23.44137.725 I-69/Pennyrile Parkway in Henderson, KYUS 60 in Owensboro, KY proposed Proposed for designation along Audubon Parkway once upgraded to Interstate standards
I-269 45.1972.73 I-55/I-69 in Hernando, MSI-69 in Millington, TN 02015-01-012015current Construction completed in October 2018; co-signed with SR 304 in MS and SR 385 in TN
I-169 18.730.1 US 45W/US 51 in Union City, TNUS 45E/SR 43 in Martin, TN proposed Proposed for designation along SR 22 once upgraded to Interstate standards
I-469 30.8349.62 I-69 in Fort Wayne, INI-69 in Fort Wayne, IN 01995-01-011995current
I-169 1.502.41 I-69E/US 77/US 83 in Olmito, TXPort of Brownsville main entrance in Brownsville, TX 02015-01-012015current Currently under construction; partially open and co-signed with SH 550
I-369 3.505.63 Tenaha, TXTexarkana, TX 02013-01-012013current Partially completed in 2013. Eventually, it will surpass I-476 as the longest Auxiliary Interstate in the country.
I-270 5.318.55 I-25/US 36 at Welby, COI-70/US 36 at Denver, CO 01965-01-011965current
I-470 Beltway around Denver Metro, CO Now part of SH 470
I-270 50.5981.42 I-55/Interstate 255I-55/I-70 near Troy, IL 01956-01-011956current
I-470 13.7222.08 I-70 in Topeka, KSI-70/Kansas Turnpike in Topeka, KS 01960-01-011960current
I-670 2.814.52 I-70 in Kansas City, KSI-70 in Kansas City, MO 01968-01-011968current
I-170 2.303.70 I-70 in Baltimore, MDUS 40 in Baltimore, MD 01969-01-01196901983-01-011983 Cancelled
I-270 32.6052.46 I-70 near Frederick, MDI-495 north of Bethesda, MD 01975-01-011975current

I-270 Spur
2.10[10]3.38 I-270 east of Potomac, MDInterstate 495I-495 northwest of Bethesda, MD 01975-01-011975current Serves as an alternate connector for Virginia travelers
I-370 2.544.09 I-270 in Gaithersburg, MDMD 200 in Derwood, MD 01988-01-011988current
I-170 11.1717.98 I-64/US 40 in Richmond Heights, MOI-270 in Hazelwood, MO 01956-01-011956current
I-470 16.7226.91 I-49/I-435 in Kansas City, MOI-70 in Independence, MO 01983-01-011983current
I-270 54.9788.47 Beltway around Columbus, OH 01964-01-011964current
I-470 6.6910.77 I-70 near Blaine, OHI-70 in Elm Grove, WV 01976-01-011976current
I-670 9.3715.08 I-70 in Columbus, OHI-270 near John Glenn Columbus International Airport 02003-01-012003current
I-271 46.0674.13 I-71 near Medina, OHI-90 in Willoughby Hills, OH 01964-01-011964current
I-471 5.759.25 I-275 near Newport, KYI-71 in Cincinnati, OH 01981-01-011981current
I-172 19.6931.69 I-72 in Quincy, ILUS 24 in Quincy, IL 01995-01-011995current
I-474 14.8823.95 I-74 in Peoria, ILI-74 in Morton, IL 01973-01-011973current
I-274 proposed Proposed route in Winston-Salem, NC
I-175 1.442.32 I-275 in St. Petersburg, FLSR 687 in St. Petersburg, FL 01980-01-011980current
I-275 60.6497.59 I-75 near Memphis, FLI-75 in Wesley Chapel, FL 01973-01-011973current
I-375 1.342.16 I-275 in St. Petersburg, FLUS 92 in St. Petersburg, FL 01979-01-011979current
I-175 US 82 in Albany, GAI-75 in Cordele, GA Now part of SR 300
I-475 15.8325.48 I-75 in Macon, GAI-75 in Macon, GA 01965-01-011965current
I-575 30.9749.84 I-75 in Kennesaw, GASR 5 west of Nelson, GA 01985-01-011985current
I-675 11.0417.77 I-75 in Stockbridge, GAI-285 southeast of Atlanta, GA 01987-01-011987current
I-275 83.71134.72 Beltway around Cincinnati, OH 01962-01-011962current Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
I-275 35.01[11][lower-alpha 1]56.34 I-75 near Monroe, MII-96, I-696 and M-5 in Farmington Hills, MI 01977-01-011977current
I-375 1.061.71 BS I-375 in Detroit, MII-75 in Detroit, MI 01964-01-011964current
I-475 16.9927.34 I-75 near Grand Blanc, MII-75/US 23 near Mount Morris, MI 01973-01-011973current Runs east and north of Flint, MI
I-675 7.7212.42 I-75/US 23 near Saginaw, MII-75/US 23 near Zilwaukee, MI 01971-01-011971current
I-475 20.3732.78 I-75 in Perrysburg, OHI-75 in Toledo, OH 01964-01-011964current
I-675 26.5342.70 I-75 near Miamisburg, OHI-70 near Medway, OH 01987-01-011987current
I-175 I-75 in Chattanooga, TNI-75 in Lexington, KY
I-275 2.984.80 I-40 in Knoxville, TNI-75/I-640 in Knoxville, TN 01982-01-011982current
I-475 I-40/I-75 near Knoxville, TNI-75 near Knoxville, TN Cancelled
I-676 6.9011.10 I-76/US 30 in Philadelphia, PAI-76 in Camden, NJ 01991-01-011991current
I-176 11.3318.23 I-76/Pennsylvania Turnpike in Morgantown, PAUS 422 near Reading, PA 01964-01-011964current
I-276 29.7847.93 I-76 in King of Prussia, PAI-95/I-295 in Bristol Township, PA 01964-01-011964current Truncated in 2018, replaced by I-95
I-376 78.70126.66 I-80 near Hermitage, PAI-76/US 22 in Monroeville, PA 01972-01-011972current
I-476 129.61208.59 I-95 near Chester, PAI-81/US 6/US 11 near Clarks Summit, PA 01992-01-011992current
I-576 proposed Proposed Southern Beltway route from Pittsburgh International Airport to I-376
I-876 01971-01-01197101972-01-011972 Short lived renumbering of I-479, now I-579
I-277 4.467.18 Beltway around uptown Charlotte, NC 01981-01-011981current
I-277 4.146.66 I-76 in Akron, OHI-77 in Akron, OH 01970-01-011970current
I-178 01971-01-011971 Cancelled
I-378 01968-01-01196801971-01-011971 Replaced by PA Route 378
I-278 35.6257.32 US 1/9 in Linden, NJBruckner Interchange in Bronx, NY 01961-01-011961current Does not intersect with parent route I-78
I-478 2.143.44 I-278 in Brooklyn, NYNY 9A in Manhattan, NY 01971-01-011971current Unsigned; does not intersect with parent route I-78
I-678 14.3323.06 John F. Kennedy International Airport in Queens, NYBruckner Interchange in Bronx, NY 01965-01-011965current Does not intersect with parent route I-78
I-878 0.701.13 I-678 in Queens, NY, near John F. Kennedy International AirportJFK Expressway in Queens, NY, near JFK Airport 01970-01-011970current Unsigned; does not intersect with parent route I-78
I-179 McKean Township, PAErie, PA 01958-01-01195801968-01-011968 Replaced by its parent route, I-79
I-279 13.3221.44 I-376/US 22/US 30 in Pittsburgh, PAI-79 in Franklin Park, PA 01972-01-011972current
I-479 01966-01-01196601971-01-011971 Early number for I-579
I-579 1.572.53 PA 885 in Pittsburgh, PAI-279/PA 28 in Pittsburgh 01962-01-011962current
I-180 US 101 in San Rafael, CAI-80 near Berkeley, CA 01978-01-01197801991-01-011991 Temporary designation of what was formerly part of SR 17, now part of I-580
I-280 57.2292.09 I-680/US 101 in San Jose, CAKing Street in San Francisco, CA 01964-01-011964current
I-380 1.6712.689 I-280 in San Bruno, CAUS 101 in San Bruno, CA 01964-01-011964current
I-480 I-80 in San Francisco, CASansome Street in San Francisco, CA 01957-01-01195701968-01-011968 Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
I-580 75.63121.71 US 101 in San Rafael, CAI-5 near Westley, CA 01964-01-011964current Segments were originally part of I-5W
I-680 70.52113.49 I-280/US 101 in San Jose, CAI-80 in Cordelia, CA 01955-01-011955current Originally SR 21
I-780 6.5010.46 I-80 in Vallejo, CAI-680 in Benicia, CA 01955-01-011955current Originally part of I-680
I-880 47.2275.99 I-280/SR 17 in San Jose, CAI-80/I-580 in Oakland, CA 01983-01-011983current Originally part of SR 17
I-880 I-80 in West Sacramento, CAI-80 in Sacramento, CA 01971-01-01197101983-01-011983 Now part of I-80
I-980 2.033.27 I-880 in Oakland, CAI-580/SR 24 in Oakland, CA 01981-01-011981current
I580 30.0948.43 US 50 in Carson City, NVI-80 in Reno, NV 02012-01-012012current Runs concurrently with US 395
I-180 13.1921.23 IL 26/IL 71 in Hennepin, ILI-80 near Princeton, IL 01969-01-011969current
I-280 26.9843.42 I-80 near Davenport, IAI-74/I-80 near Colona, IL 01990-01-011990current
I-380 73.05117.56 I-80 near Iowa City, IAUS 218 in Waterloo, IA 01985-01-011985current Connects Cedar Rapids, IA, with I-80
I-480 4.907.89 I-80/US 75 in Omaha, NEI-29/US 6 in Council Bluffs, IA 01966-01-011966current
I-680 16.4926.54 I-80 in Omaha, NEI-29 near Crescent, IA 01966-01-011966current
I-880 16.5726.67 I-29 near Loveland, IAI-80 near Neola, IA 02019-01-012019current Former section of I-680
I-180 3.185.12 US 34 in Lincoln, NEI-80/US 34/US 77 in Lincoln, NE 01965-01-011965current
I-280 01958-01-01195801965-01-011965 Now designated as I-680
I-580 1.602.57 I-480 in Omaha, NELake Street in Omaha, NE 01976-01-01197601982-01-011982 Now part of US 75
I-280 17.8528.73 I-80 in Parsippany-Troy Hills, NJI-95/New Jersey Turnpike in Kearny, NJ 01958-01-011958current
I-280 12.4119.97 I-75 in Toledo, OHI-80/I-90/Ohio Turnpike in Lake Township, OH 01959-01-011959current
I-380 I-76/I-77 in Akron, OHI-271 in Macedonia, OH proposed
I-480 41.7767.22 I-80/Ohio Turnpike in North Ridgeville, OHI-80/Ohio Turnpike in Streetsboro, OH 01971-01-011971current
I-680 16.4326.44 I-76/Ohio Turnpike in North Lima, OHI-80/SR 11 near Mineral Ridge, OH 01964-01-011964current
I-180 28.8546.43 US 15/US 220 in Williamsport, PAI-80/PA 147 near Milton, PA 01984-01-011984current
I-180 Now part of I-176
I-280 01958-01-01195801964-01-011964 Now part of Pennsylvania Turnpike
I-380 24.7639.85 I-80 in Tunkhannock Township, PAI-81/I-84/US 6 in Dunmore, PA 01973-01-011973current
I-480 Now part of I-476
I-680 01958-01-01195801964-01-011964 Now I-676
I-180 1.091.75 I-80 in Cheyenne, WYI-80 Bus./US 30 in Cheyenne, WY 01984-01-011984current Not built to Interstate Highway standards
I-481 15.0424.20 I-81 in Onondaga, NYI-81/NY 481 in North Syracuse, NY 01970-01-011970current
I-781 4.306.92 I-81 in Pamelia, NYFort Drum main gate in Le Ray, NY 02012-01-012012current
I-381 1.672.69 SR 381 in Bristol, VAI-81 in Bristol, VA 01961-01-011961current
I-581 6.6410.69 US 220/SR 24 in Roanoke, VAI-81 near Hollins, VA
I-181 23.8538.38 US 321/SR 67 in Johnson City, TNUS 11W/SR 1 in Kingsport, TN 01985-01-01198502007-01-012007 Now part of I-26
I-182 15.1924.45 I-82/US 12 near Richland, WAUS 12/US 395 in Pasco, WA 01986-01-011986current
I-283 2.914.68 I-76/Pennsylvania Turnpike near Highspire, PAI-83/US 322/Capital Beltway near Harrisburg, PA 01972-01-011972current
I-384 8.2013.20 I-84/US 6 in East Hartford, CTUS 6/US 44 in Bolton, CT 01984-01-011984current
I-684 28.4745.82 I-287 near White Plains, NYNY 22 near Brewster, NY 01974-01-011974current Also crosses into Connecticut
I-184 3.625.83 I-84 in Boise, IDUS 20/US 26 01990-01-011990current
I-685 14.0022.53 I-65 in downtown Montgomery, ALI-85 in Montgomery, AL proposed
I-185 49.3079.34 US 27/US 280/SR 520 in Columbus, GAI-85 near LaGrange, GA 01979-01-011979current
I-285 63.98102.97 Beltway around Atlanta, GA 01969-01-011969current
I-485 5.99.5 I-75/I-85 in Atlanta, GAI-85 in Atlanta 01964-01-01196401975-01-011975 Now Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
I-985 24.0438.69 I-85 near Buford, GASR 369 near Gainesville, GA 01985-01-011985current
I-285 22.836.7 I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NCI-40/US 52/US 311/NC 8 in Winston-Salem, NC 02018-01-012018current An unconfirmed section of Future I-285 is to continue north of I-40 for 10 miles (16 km) along US 52, through downtown Winston-Salem, to the proposed Winston-Salem Northern Beltway.[14][15]
I-485 66.68107.31 Beltway around Charlotte, NC 01988-01-011988current
I-785 2.213.56 I-40/I-85/I-840/I-85 Bus. in Greensboro, NCUS 70 in Greensboro, NC 02013-01-012013current Future northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
I-885 I-40/NC 147 in Research Triangle Park, NCI-85/US 70/US 15 in Durham, NC proposed Proposed routing along the East End Connector on the east side of Durham, NC; to be complete in May 2020
I-185 17.7028.49 I-385 near Mauldin, SCUS 29 in Greenville, SC 01955-01-011955current
I-385 42.1667.85 I-26 near Clinton, SCUS 276 in Greenville, SC 01962-01-011962current
I-585 2.253.62 US 176/US 221/SC 9 in Spartanburg, SCI-85 Bus./US 176 near Spartanburg, SC 01962-01-011962current
I-287 98.72158.87 I-95/New Jersey Turnpike in Edison, NJI-95 in Rye, NY 01961-01-011961current
I-587 1.211.95 I-87/New York State Thruway/NY 28 in Kingston, NYNY 28/NY 32 in Kingston, NY 01960-01-011960current
I-587 Future I-87 (current US 64) near Zebulon, NCUS 264 near Greenville, NC proposed[16]
I-787 10.1616.35 I-87/New York State Thruway in Albany, NYNY 7 in Green Island, NY 01968-01-011968current
I-189 1.492.40 US 7 in South Burlington, VTI-89 in South Burlington, VT 01980-01-011980current
I-190 3.074.94 O'Hare International Airport in Chicago, ILI-90 in Chicago, IL 01978-01-011978current
I-290 29.8448.02 I-90/IL 53 in Rolling Meadows, ILI-90/I-94/Congress Parkway in Chicago, IL 01972-01-011972current
I-490 I-294I-90 proposed Proposed route number for the O'Hare West Bypass[17]
I190 19.2631.00 I-290 in Worcester, MARoute 2 in Leominster, MA 01983-01-011983current
I290 20.1632.44 I-395 in Auburn, MAI-495 in Marlborough, MA 01970-01-011970current
I-190 28.3445.61 I-90/New York State Thruway in Cheektowaga, NYHighway 405 at Lewiston, NY 01959-01-011959current
I-290 9.8015.77 I-190 in Tonawanda, NYI-90/New York State Thruway in Williamsville, NY 01964-01-011964current
I-390 76.06122.41 I-86/NY 17 in Avoca, NYI-490 in Gates, NY 01973-01-011973current
I-490 37.4060.19 I-90/New York State Thruway in Bergen, NYI-90/New York State Thruway in Victor, NY 01970-01-011970current
I-590 5.318.55 I-390 in Brighton, NYI-490/NY 590 in Rochester, NY 01980-01-011980current
I-690 14.1922.84 I-90/New York State Thruway/NY 690 in Van Buren, NYI-481 in East Syracuse, NY 01962-01-011962current
I-790 2.413.88 I-90/New York State Thruway in Deerfield, NYNY 5A/NY 55 in Utica, NY 01961-01-011961current
I-890 9.3515.05 I-90/New York State Thruway in Rotterdam, NYI-90/New York State Thruway in Guilderland, NY 01962-01-011962current
I-990 6.3510.22 I-290 in Amherst, NYNY 263 near Lockport, NY 01985-01-011985current Highest numbered Interstate in the Interstate system
I-490 2.433.91 I-71/I-90 in Cleveland, OHEast 55th Street in Cleveland, OH 01990-01-011990current
I-190 1.722.77 I-90 in Rapid City, SDUS 16 in Rapid City, SD 01962-01-011962current
I-291 6.029.69 I-91 in Windsor, CTI-84 in Manchester, CT 01994-01-011994current
I-691 8.3813.49 I-84 at the Southington-Cheshire, CT, town lineI-91 in Meriden, CT 01988-01-011988current
I291 5.448.75 I-91 in Springfield, MAI-90/Massachusetts Turnpike in Chicopee, MA 01972-01-011972current
I391 4.467.18 I-91 in Chicopee, MAHigh Street in Holyoke, MA 01970-01-011970current
I-293 11.1817.99 I-93/NH 101 in Manchester, NHI-93/Everett Turnpike in Hooksett, NH 02008-01-012008current
I-393 4.607.40 I-93 in Concord, NHNH 9 in Pembroke, NH 01979-01-011979current
I-294 53.4285.97 I-80/I-94 in South Holland, ILI-94 in Deerfield, IL 01968-01-011968current
I-194 3.385.44 I-94 in Battle Creek, MIM-66 in Battle Creek, MI 01961-01-011961current
I-394 9.7515.69 I-494/US 12 in Minnetonka, MN4th Street in Minneapolis, MN 01991-01-011991current
I-494 42.9469.11 I-94/I-694 in Maple Grove, MNI-94/I-694 in Woodbury, MN 01985-01-011985current Western and southern half of the Minneapolis–St. Paul beltway
I-694 30.7749.52 I-94/I-494 in Maple Grove, MNI-94/I-494 in Woodbury, MN 01970-01-011970current Northern and eastern half of the Minneapolis–St. Paul beltway
I-194 1.201.93 McKenzie Drive near Bismarck, NDI-94 near Mandan, ND Unsigned
I-794 3.756.04 I-43/I-94 in Milwaukee, WIWIS 794 in Milwaukee, WI 01980-01-011980current
I-894 4.707.56 I-41/I-94 in Milwaukee, WII-41/I-43/I-94 in Milwaukee, WI 01966-01-011966current Completely concurrent with I-41
I-395 54.6988.02 I-95 in East Lyme, CTI-290 in Auburn, MA 01983-01-011983current
I-295 92.30148.54 I-95/I-495 in New Castle, DEI-95 in Bristol Township, PA 01994-01-011994current Extended into Pennsylvania in 2018
I-495 11.4718.46 I-95/I-295 in Newport, DEI-95 in Lower Chichester Township, PA 01977-01-011977current
I-895 01979-01-01197901980-01-011980 Now part of I-95
I-395 13.3921.55 I-95/I-495 in Springfield, VAUS 50 in Washington, DC 01977-01-011977current Original route of I-95 that was proposed to continue through Washington, DC
I-495 64103 Beltway around Washington, DC 01961-01-011961current Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
I-695 2.003.22 I-395 in Washington, DCI-295 in Washington, DC[18] 01958-01-011958current
I-195 4.427.11 I-95/SR 112 in Miami, FLSR 905 in Miami Beach, FL 01961-01-011961current
I-295 61.0498.23 Beltway around Jacksonville, FL 01970-01-011970current
I-395 1.292.08 I-95 in Miami, FLMacArthur Causeway at Watson Island, Miami, FL 01971-01-011971current
I-595 12.8620.70 I-75/SR 869 in Weston, FLUS 1 in Fort Lauderdale, FL 01990-01-011990current
I-795 I-95 south of Jacksonville, FLI-295 in Jacksonville, FL proposed Currently under construction; partially open as SR 9B but not yet signed as I-795
I-195 1.552.49 I-95/Maine Turnpike in Saco, MESR 5 in Saco, ME 01980-01-011980current
I-295 53.1185.47 I-95/Maine Turnpike in Scarborough, MEI-95/Maine Turnpike in Gardiner, ME 01960-01-011960current
I-395 4.998.03 I-95/US 2/SR 100 in Bangor, MEUS 1A in Brewer, ME 02008-01-012008current
I-495 3.705.95 I-95/Maine Turnpike in Portland, MEI-295/US 1 in Falmouth, ME 02004-01-012004current Unsigned
I-195 4.71[19]7.58 I-95/MD 166 near Catonsville, MDBaltimore-Washington International Airport 01990-01-011990current
I-395 1.983.19 I-95 in South Baltimore, MDWest Pratt Street in Baltimore, MD 01981-01-011981current
I-595 19.9732.14 I-95/I-495/US 50 near Washington, DCUS 50/US 301/MD 70 in Annapolis, MD 02011-01-012011current Unsigned designation for US 50
I-695 30.5749.20 Beltway around Baltimore, MD 01958-01-011958current
I-795 8.9914.47 I-695 in Pikesville, MDMD 140 in Reisterstown, MD 01985-01-011985current
I-895 11.4418.41 I-95 near Elkridge, MDI-95 in Baltimore, MD 01979-01-011979current
I-295 8.0512.96 I-95/I-495 near Forest Heights, MDI-695 in Washington, DC 01964-01-011964current
I195 44.5571.70 I-95 in Providence, RII-495/Route 25 in Wareham, MA 01958-01-011958current
I295 26.5842.78 I-95 in Warwick, RII-95 in Attleboro, MA 01969-01-011969current
I495 121.56195.63 I-195/Route 25 in Wareham, MAI-95 in Salisbury, MA 01957-01-011957current
I695 I-93 in Roxbury, MAI-93 in Charlestown, MA 01955-01-01195501971-01-011971 Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
I895 Route 37/I-295 in Cranston, RII-95/I-295 in Attleboro, MA 01968-01-01196801982-01-011982 Cancelled; would have supplemented I-295 to create a full Beltway around Providence, RI
I-195 34.1754.99 I-295 in Hamilton Township, NJRoute 34 in Wall Township, NJ 01968-01-011968current
I-895 I-295 in Burlington, NJI-95 in Bristol, PA 01963-01-01196301981-01-011981 Never built
I-295 7.7012.39 NY 25/NY 24 in Queens, NYBruckner Interchange in Bronx, NY 01970-01-011970current
I-495 66.38106.83 Queens Midtown Tunnel in Manhattan, NYCR 58 in Riverhead, NY 01958-01-011958current
I-695 1.402.25 I-95 in Bronx, NYI-295 in Bronx, NY 01986-01-011986current
I-895 1.121.80 I-278 in Bronx, NYI-95 in Bronx, NY 01970-01-01197002017-01-012017[20] Currently designated as NY 895
I-295 proposed Planned route around the west side of Fayetteville, NC
I-495 4.106.60 I-440/US 64/US 64 Bus. in Raleigh, NCI-540/US 64/US 264 in Knightdale, NC 02013-01-01201302017-01-012017 Now part of I-87
I-795 25.4640.97 US 70/US 117 in Goldsboro, NCI-95/US 264 in Wilson, NC 02007-01-012007current
I-695 I-95 near Philadelphia International AirportI-95 in Philadelphia, PA 01964-01-01196401977-01-011977 Never built
I-195 3.245.21 SR 195 in Richmond, VAI-64/I-95 in Richmond, VA 01970-01-011970current
I-295 52.5684.59 I-95 near Petersburg, VAI-64 near Short Pump, VA 01980-01-011980current
I-595 I-395 near Arlington, VAUS 1 at Ronald Reagan Washington National Airport Now part of US 1
I-895 I-95 near Richmond, VAI-295 near Richmond, VA 01996-01-01199602002-01-012002 Currently designated as SR 895, it was originally planned as a Interstate designation, but did not get approved by AASHTO
I-495 01956-01-01195601958-01-011958 Early number of I-476
I-196 37.07[11]59.66 US 31 in Norton Shores, MII-96/US 16 in Grand Rapids, MI 01959-01-01195901963-01-011963 Now the western end of I-96
I-196 80.65129.79 I-94/US 31 near Benton Harbor, MII-96/M-37 in Grand Rapids, MI 01963-01-011963current
I-296 3.435.52 I-196 in Grand Rapids, MII-96/M-37 in Walker, MI 01962-01-011962current Unsigned since 1979
I-496 11.7818.96 I-69/I-96 near Lansing, MII-96 and US 127 near Lansing, MI 01970-01-011970current
I-696 29.3947.30 I-96/I-275 & M-5 in Novi, MII-94 in Roseville, MI 01989-01-011989current
I-197 3.445.54 Replaced by I-595.
I-297 01987-01-011987 Withdrawn from request, replaced by MD Route 3.
  •       Former
  •       Future

See also

  • U.S. Roads portal

Notes

  1. According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.[3] MDOT and most major map publishers do count the overlap.[11][12][13]

References

  1. Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. Washington, DC: Federal Highway Administration. 60 (1). Retrieved March 16, 2012.
  2. DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 2008.
  3. Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved February 6, 2016.
  4. Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017.
  5. Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved February 5, 2009.
  6. Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
  7. Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007.
  8. Federal Highway Administration (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved July 8, 2007.
  9. Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Archived from the original (PDF) on March 4, 2016. Retrieved January 9, 2015 via American Association of State Highway and Transportation Officials.
  10. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
  11. Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved February 6, 2016.
  12. Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in≈5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010.
  13. Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved February 24, 2010.
  14. "Ask SAM: Upgrades needed before US 52 can be called I-285". Winston-Salem Journal. January 10, 2014. Retrieved January 10, 2014.
  15. "NCDOT: Project U-2826". Archived from the original on October 29, 2011. Retrieved April 17, 2014.
  16. "State Seeking Future Interstate Designation for US 264 to Greenville". North Carolina Governor's Office (Press release). Retrieved November 10, 2016.
  17. Borggren, Erica J. (October 6, 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on March 3, 2016.
  18. DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.
  19. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
  20. Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Archived (PDF) from the original on June 3, 2019. Retrieved October 21, 2017.
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