Wikipedia

List of suffixed Interstate Highways

In the United States, there are currently eight routes in theInterstate Highway Systemthat are signed with letter suffixes to the route number.Interstate 35(I-35) splits intoI-35EandI-35Win theDallas–Fort Worth metroplexin Texas, and similarly splits intoI-35EandI-35Win theMinneapolis–St. Paularea in Minnesota. Other suffixed Interstates includeI-69C,I-69EandI-69WinSouth Texas,andI-480Nin Ohio, which is designated as such on mile markers but is otherwise unsigned. The state ofMarylandhas four unsigned suffixed Interstate designations that are designated by theMaryland State Highway Administration,rather than by theFederal Highway Administration(FHWA).

Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 35E marker
Interstate 69W marker
Highway shieldsfor Interstate 35E and Interstate 69W
The 1958 Interstate Highway System plan included many suffixed Interstates.
System information
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate X (I-X)
System links

There were once many more suffixed Interstates, as thethree-digit Interstateswere not designated until after all major routes were assigned numbers. Most of these were spurs; the suffixed route did not return to its parent. In 1980, theAmerican Association of State Highway and Transportation Officials(AASHTO) abolished the majority of suffixes due to confusion, renumbering them as three-digit Interstates. For example,I-15Ein California has since becomeI-215.

List

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Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-5W — — I-5inTracy, CA I-5 inDunnigan, CA — — Replaced byI-580,I-80andI-505
I-5E — — I-5inTracy, CA I-5 inDunnigan, CA 01958-01-011958 01982-01-011982 Replaced by I-5
I-15E — — I-15inTemecula, CA I-15 inDevore, CA 01973-01-011973 01982-01-011982 Renumbered fromI-215in 1973 and back to I-215 in 1982
I-15W — — I-15inMurrieta, CA I-15inSan Bernardino, CA 01957-01-011957 — BecameI-15in 1957
I-15W — — I-80NinRupert, ID I-15inPocatello, ID 01958-01-011958 01980-01-011980 BecameI-86in 1980; was also planned asI-82N
I-24W — — I-55inHayti, MO I-40inJackson, TN — 01964-01-011964 Did not connect toI-24;renumberedI-155
I-35W 85.20 137.12 I-35inHillsboro, TX I-35 inDenton, TX 01959-01-011959 current
I-35E 96.76 155.72 I-35inHillsboro, TX I-35 inDenton, TX 01959-01-011959 current
I-35W — — I-35inWichita, KS I-70inSalina, Kansas — 01976-01-011976[2] RenumberedI-135[2]
I-35W 41.78 67.24 I-35inBurnsville, MN I-35 inForest Lake, MN 01960-01-011960 current
I-35E 39.34 63.31 I-35inBurnsville, MN I-35 inForest Lake, MN 01970-01-011970 current Trucks over 9,000 lb (4,100 kg) gross weight prohibited between MN 5 and I-94
I-59B — — Bypass forI-59aroundBirmingham, AL — — RenumberedI-459
I-69W 1.43 2.30 Fed. 85DatMexican borderonWorld Trade International BridgeatLaredo, TX I-35/US 83/US 59/Loop 20in Laredo, TX 02014-01-012014 current Partially completed
I-69C 18.02 29.00 I-2/US 83/US 281inPharr, TX US 281/FM 490inEdinburg, TX 02013-01-012013 current Partially completed
I-69E 81.00 130.36 East Rio Grande Valley segment:US 77/US 83/University Boulevard inBrownsville, TX
Corpus Christi area segment:US 77/FM 1356inKingsville, TX		 East Rio Grande Valley segment:US 77nearRaymondville, TX
Corpus Christi area segment:I-37/US 77inCorpus Christi, TX 		02011-01-012011 current Partially completed
I-70S — — I-70inWashington, PA I-70/I-80SinNew Stanton, PA 01958-01-011958 01964-01-011964 Became part of I-70 and former I-70 became parts ofI-79andI-76
I-70N — — I-70inFrederick, MD I-83/I-95inBaltimore, MD 01958-01-011958 01973-01-011973 BecameI-70
I-70S — — I-70inFrederick, MD I-66/I-95inWashington, DC 01958-01-011958 01973-01-011973 BecameI-270
I-75E — — Bypass forI-75aroundTampa-St. Petersburg, FL — 01973-01-011973 RenumberedI-275;later swapped with I-75 in 1973
I-80N — — I-5inPortland, OR I-80inEcho, UT 01958-01-011958 01980-01-011980 BecameI-84
I-80S — — I-25/I-70inDenver, CO I-80inBig Springs, NE 01958-01-011958 01980-01-011980 BecameI-76
I-80N — — I-80inNeola, IA I-29inLoveland, IA — 01973-01-011973 Became part ofI-680,thenI-880after I-680 was split
I-80N — — I-80/I-90inLorain County, OH I-80S/SR 5inBraceville Township, OH 01960-01-011960 01962-01-011962 Redesignated as I-80
I-80S — — I-80inYoungstown, OH I-295inCamden, NJ — 01970-01-011970 Extended west toLodi, OH,by 1962 over former I-80; east end truncated toMonroeville, PA,and the part east of Monroeville renumberedI-76in 1964; the rest became part of I-76
I-81S — — I-81inScranton, PA I-80at Crescent Lake — 01964-01-011964 Formerly I-82, became I-81E (now I-380)
I-81E — — I-81inScranton, PA I-80inScotrun, PA 01964-01-011964 01973-01-011973 Formerly I-81S, became I-380
I-82S — — Burley, ID Tremonton, UT 01957-01-011957 — BecameI-84
I-82N — — Burley, ID Pocatello, ID 01957-01-011957 — BecameI-86
I-90N — — Buffalo, NY Canadian borderatLewiston, NY 01957-01-011957 01959-01-011959 Original designation for I-190 in New York, renamed I-190
I-94N — — Muskegon, MI I-94inGrand Rapids, MI 01957-01-011957 01959-01-011959 BecameI-196in 1959[3]and thenI-96in 1964[4]
I-95E — — East Providence, RI - 01957-01-011957 01959-01-011959 RenumberedI-195
I-180N — — I-80N Boise, ID — 01980-01-011980 This was the only suffixed three-digit Interstate (until I-480N in Ohio was designated); all other spurs of suffixed routes had no suffix; becameI-184
I-270Y 2.10[5] 3.38 I-270inBethesda, MD I-495inBethesda, MD 01975-01-011975 current Signed as I-270 Spur; designated internally by MDSHA asI-270Y.
I-480N 1.99[6] 3.20 I-480inMaple Heights, OH US 422inWarrensville Heights, OH 01974-01-011974 current Signed as I-480 on guide signs and reassurance markers, signed as I-480N on mile markers
I-495X 1.50[5] 2.41 I-495inBethesda, MD Clara Barton ParkwayinCabin John, MD 01965-01-011965 current Also known asCabin John Parkway;designated internally by MDSHA as I-495X; unsigned; trucks are not allowed on the length of the freeway
I-895A 0.71[5] 1.14 I-895BinBrooklyn Park, MD I-97inFerndale, MD 01965-01-011965 current Unsigned. Internally designated by MDSHA as I-895A
I-895B 2.67[5] 4.30 I-895inBrooklyn Park, MD Governor Ritchie HighwayinGlen Burnie, MD 01965-01-011965 current Unsigned. Internally designated by MDSHA as I-895B
  • Former

See also

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References

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  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.RetrievedMarch 16,2012.
  2. ^abKansas Department of Transportation(2009)."1970s".Kansas Celebrates 50 Years of Interstates.Kansas Department of Transportation. Archived fromthe originalon February 12, 2012.RetrievedJuly 16,2013.
  3. ^"Spring to Bring Debut for Interstate Road Numbering".The Herald-Press.St. Joseph, Michigan.Associated Press.January 8, 1959. p. 5.OCLC10117184.RetrievedJuly 11,2018– viaNewspapers.com.
  4. ^"Route Number Changes Slated".Lansing State Journal.December 12, 1963. p. 10.OCLC61312043.RetrievedSeptember 17,2017– via Newspapers.com.
  5. ^abcdHighway Information Services Division (December 2013)."Highway Location Reference"(Webpage).Maryland Department of Transportation.
  6. ^Office of Technical Services (January 1999)."Technical Services Straight Line Diagram for I-480N"(PDF).Ohio Department of Transportation.
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