Interstate 88 (Illinois)
|Maintained by IDOT and ISTHA|
|Length||140.60 mi (226.27 km)|
|West end||IL 5 / IL 92 near East Moline|
I-290 / I-294 Toll / IL 110 (CKC) in Hillside
|Counties||Rock Island, Whiteside, Lee, Ogle, DeKalb, Kane, DuPage, Cook|
Interstate 88 (I-88) is an Interstate Highway in the US state of Illinois that runs from an interchange with I-80 near Silvis and Moline to an interchange with I-290 and I-294 in Hillside, near Chicago. I-88 is 140.60 miles (226.27 km) long. This route is not contiguous with I-88 in New York. Since 2010, most of I-88 has been part of the Chicago–Kansas City Expressway. The highway also runs through the cities of Aurora, Naperville, DeKalb, and Dixon. East of Rock Falls, the route is a part of the Illinois Tollway system.
Interstate 88 runs concurrently with IL 100; speed limit is 70 miles per hour (CKC) 
East Moline to Yeoward Addition
Starting at I-80 at a cloverleaf, IL 5 ends there while IL 92 continues eastward. I-88 begins at that interchange and then traverses eastward. Immediately east of the cloverleaf, I-88, IL 92, and IL 110 meet a road at a diamond interchange. This road used to be part of IL 2 and IL 92. They then traverse eastward until IL 92 branches off east near Joslin. The freeway then meets the next two local roads each having a diamond interchange. One of the interchanges serves Hillsdale while the other one serves Erie. The two routes then meet IL 78 near Lyndon. Near Como, they then meet US 30 at a trumpet interchange. South of Rock Falls, they then meet IL 40 at a diamond interchange. East of Yeoward Addition, they again meet US 30 at a diamond interchange.
Yeoward Addition to Aurora
At this point, a freeway becomes a tollway for the rest of I-88. However, at the IL 26 interchange, there are no tolls present on each ramp. Beyond that, the tollway crosses under US 52 without direct access. Then, the two routes meet their first mainline toll plaza. Further east, they then meet IL 251 (at a diamond interchange) and I-39/US 51 (at a cloverleaf interchange) at Rochelle. From then on, they meet another mainline toll plaza. In DeKalb, they then meet Annie Glidden Road at a trumpet interchange, then crossing over IL 23 without direct access, then meet an oasis (a rest area), and then Peace Road at a 4-ramp parclo. South of Nottingham Woods, they meet IL 47 at a 5-ramp parclo with two ramps requiring I-Pass. Further east, they then meet IL 56 at a partial interchange. At this point, IL 56 follows the two routes. They then meet Orchard Road at a 4-ramp parclo. Then, IL 56 leaves the freeway at the IL 31 interchange.
Aurora to Hillside
Across the Fox River, I-88 and IL 110 meet another toll plaza. Then, they meet Farnsworth Avenue at a 6-ramp parclo near the Chicago Premium Outlets. From then on, they meet Eola Road indirectly, IL 59 at a diverging diamond interchange, Winfield Road at a diamond interchange, Naperville Road at a mix of partial interchanges, and IL 53 at an incomplete parclo. Beyond that, they meet I-355 at a mix of interchanges. At Highland Avenue interchange, all but the westbound on-ramp are present. The other one enters I-88 westbound from Downers Drive. After that, the eastbound tollway meets another mainline toll plaza. After that, I-88 and IL 110 then meet Midwest Road at a 2-ramp incomplete parclo (no westbound on/off-ramp). Then, they meet IL 83 at a 3-ramp incomplete parclo, 22nd Street at a RIRO (no eastbound on/off-ramp), another mainline toll plaza for westbound traffic, and I-294/IL 38. Beyond I-294/IL 38, I-88 briefly leaves the tollway before ending at I-290. At that point, IL 110 continues eastward via I-290.
In 1975, IL 5 was extended westward to Rock Falls. Back then, only a small portion south of Rock Falls was free. At that point, there were two proposed freeways connecting each individual cities, FAP 402 (a proposed freeway to Clinton, Iowa) and FAP 403 (another proposed freeway to East Moline). However, only FAP 403 was being built. By 1979, IL 5 finished completing the FAP 403 freeway.
The reason for I-88's original designation and continued existence as an Interstate has to do with a technicality in the old National Maximum Speed Law (NMSL). Originally passed in 1973, the NMSL was amended in 1987 to permit 65-mile-per-hour (105 km/h) speed limits on rural stretches of Interstate Highways only. Even though IL 5 was fully up to Interstate Highway standards, it still had to carry a 55-mile-per-hour (89 km/h) limit because of this wording in NMSL. The Illinois Department of Transportation (IDOT) and Illinois State Toll Highway Authority (ISTHA) petitioned the American Association of State Highway and Transportation Officials (AASHTO) to re-designate IL 5 as an Interstate, and in 1987, AASHTO approved the request and assigned the I-88 numbering to the highway. The NMSL would be completely repealed only eight years later in 1995, but the I-88 shields remain to this day, even though Chicago–Kansas City Expressway (IL 110) markers are being posted throughout the entire length of I-88, since it is now part of the Chicago to Kansas City Expressway project, bannered with special "CKC" logos.
Ronald Reagan Memorial Tollway
Opened November 21, 1958, it was initially designated as U.S. Route 30 Toll (US 30 Toll), and later IL 190. The original routing extended from the I-294 interchange near Hillside to IL 47 near Sugar Grove. IL 56 was overlapped on the East-West Tollway between North Aurora and Sugar Grove in 1965.
When the East-West Tollway was extended to Dixon in the 1970s, the IL 190 numbering was removed from the stretch between Aurora and Sugar Grove, making that section strictly IL 56. Once complete, the new routing of the combined tollway and freeway between I-80 near the Quad Cities and I-294 became designated as IL 5. In the late 1980s, it was renumbered I-88.
Officially, the tollway portion begins in Rock Falls, starting at the intersection with US 30 at mile marker 44, although the first toll plaza does not appear until after the IL 26 interchange in Dixon, making the section between US 30 and IL 26 technically a freeway. It continues as a tollway until its terminus in Hillside, although there is a free section between exit 76 (IL 251) and exit 78 (I-39). West of US 30 to I-80, I-88 is a freeway. The tollway portion is 96 miles (154 km) long.
After the death of Illinois native and former President Ronald Reagan in 2004, the Illinois State Toll Highway Authority (ISHTA) voted to rename the toll roadway "Ronald Reagan Memorial Tollway" in his memory, as it passes near his birthplace of Tampico and grazes the south outskirts of his boyhood hometown of Dixon. The tollway portion of I-88 was previously known as the "East–West Tollway" and is still displayed as such on some signs near Chicago.
Although a federal law, 23 U.S.C. § 111, prohibits the operation of commercial rest areas constructed after January 1, 1960, on Interstate Highways, the DeKalb oasis was constructed at milepost 93 in 1975, prior to the route's designation as I-88 and remains in operation.
From 2005 lasting through 2012, ISTHA reconstructed and widened much of the original portion of I-88, between York Road and IL 56. Approximately $991.6 million was budgeted for I-88 over that period. Between 2005 and 2009, I-88 was reconstructed and widened to four lanes in each direction between IL 59 and York Road, with work progressing gradually from west to east. The project included a reconstruction and reconfiguration of the Naperville Road interchange. Between IL 56 and the Aurora Toll Plaza, I-88 was reconstructed and widened to three lanes, including the reconstruction of the IL 31 interchange and new bridges over the Fox River.
|Rock Island||Hampton Township||0.00||0.00||IL 5 / IL 92 west – Moline, Rock Island||Continuation beyond western terminus; western end of IL 92 concurrency|
I-80 / IL 110 (CKC) south to I-74 – Des Moines, Peoria
|Signed as exits 1A (east) and 1B (west); western end of IL 110 concurrency; I-80 exit 4B|
|0.75||1.21||1C||Old IL 2|
|Joslin||5.69||9.16||6||IL 92 east – Joslin||Eastern end of IL 92 concurrency|
|Hillsdale||10.26||16.51||10||Hillsdale, Port Byron|
|Whiteside||Erie||18.44||29.68||18||Erie, Albany||To IL 84|
|Lyndon||25.70||41.36||26||IL 78 – Morrison, Prophetstown||Former IL 2|
To US 30 – Clinton, Rock Falls, Sterling
|41.11||66.16||41||IL 40 – Rock Falls, Sterling|
|43.98||70.78||44||US 30 – Joliet, Rock Falls||Eastern end of Ronald Reagan Memorial Highway; western end of Ronald Reagan Memorial Tollway|
|Lee||Dixon||54.12||87.10||54||IL 26 – Dixon|
|56.15||90.36||Dixon Toll Plaza 69|
|Ogle||Rochelle||75.87||122.10||76||IL 251 – Rochelle, Mendota|
|78.33||126.06||78||I-39 / US 51 – Bloomington, Normal, Rockford||Signed as exits 78A (south) and 78B (north); I-39 exit 97|
|DeKalb||DeKalb||86.25||138.81||DeKalb Toll Plaza 66|
Annie Glidden Road to IL 38 / IL 23 – DeKalb
|Westbound exit and eastbound entrance ramps pay toll|
Peace Road to IL 38
|Westbound exit and eastbound entrance ramps pay toll|
|Kane||Sugar Grove||108.97||175.37||109||IL 47||I-PASS only on westbound exit and eastbound entrance ramps|
IL 56 west to US 30 – Sugar Grove
|Western end of IL 56 concurrency; westbound exit and eastbound entrance|
|114.06||183.56||114||Orchard Road||Was exit 115; eastbound exit and westbound entrance ramps pay toll|
|North Aurora||116.52||187.52||117||IL 31 / IL 56 east||Eastern end of IL 56 concurrency; eastbound exit and westbound entrance ramps pay toll|
|Aurora||117.48||189.07||Aurora Toll Plaza 61|
|118.88||191.32||119||Farnsworth Avenue||Signed as exits 119A (south) and 119B (north) westbound; westbound exit and eastbound entrance ramps pay toll|
To CR 14 (Eola Road)
|I-PASS only on westbound exit and eastbound entrance ramps|
|Naperville||122.93||197.84||123||IL 59||Diverging diamond interchange as of October 2015|
|Warrenville||124.81||200.86||125||CR 13 (Winfield Road)||Eastbound exit and westbound entrance ramps pay toll|
To CR 23 (Naperville Road)
|Eastbound exit and westbound entrance ramps pay toll|
|Lisle||129.63||208.62||130||IL 53 (Lincoln Avenue)||Westbound exit and eastbound entrance|
I-355 Toll (Veterans Memorial Tollway) to US 34 (Ogden Avenue) – Joliet, Northwest Suburbs
|Signed as exits 131A (south) and 131B (north) westbound; signed as exits 131 (south) and 132 (north) eastbound; I-355 exit 20|
|133.88||215.46||134||CR 9 (Highland Avenue)||Eastbound exit and westbound entrance ramps pay toll; westbound entrance via Downers Drive|
|Oak Brook||134.62||216.65||Meyers Road Toll Plaza 52 (eastbound)|
|136.02||218.90||136||CR 15 (Midwest Road)||Eastbound exit and entrance; entrance ramp pay toll|
|136.77||220.11||137||IL 83 south (Kingery Highway)||Westbound exit and eastbound entrance; eastbound entrance ramp pay toll|
22nd Street (Cermak Road) to IL 83 north (Kingery Highway)
|Westbound entrance and exit|
|137.73||221.65||York Road Toll Plaza 53 (westbound)|
I-294 Toll south (Tri-State Tollway) to York Road – Indiana
|Eastbound exit and westbound entrance; exit includes direct exit ramp onto York Road; York Road exit signed as exit 138 eastbound; I-294 exit 29|
I-294 Toll north (Tri-State Tollway) – Milwaukee, O'Hare
I-290 west – Rockford
|Eastbound exit and westbound entrance; I-294 exit 31A|
I-294 Toll south (Tri-State Tollway) – Indiana
IL 38 west (Roosevelt Road)
|Westbound exit and eastbound entrance|
I-290 east (Eisenhower Expressway) to US 12 / US 20 / US 45 (Mannheim Road) – Chicago
|Eastbound exit only; all trucks must exit onto a local lane|
I-290 east / IL 110 (CKC) east (Eisenhower Expressway) – Chicago
|Eastern terminus; eastern end of Ronald Reagan Memorial Tollway; eastern end of IL 110 concurrency; I-290 exit 15A|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Mehler, Neil H. (July 6, 1987). "Road with Many Names Gets a New One". Chicago Tribune (National ed.). p. C3. Retrieved February 16, 2008.
- Illinois Technology Transfer Center (2006). "T2 GIS Data". Illinois Department of Transportation. Retrieved November 8, 2007.
- Google (November 18, 2020). "Overview map of I-88" (Map). Google Maps. Google. Retrieved November 18, 2020.
- Illinois Department of Transportation (1975). Illinois Highway Map (Map). [1:772,500]. Springfield: Illinois Department of Transportation. Retrieved November 22, 2020 – via Illinois Digital Archives.
- "Illinois Supplemental Freeway System" (PDF). Retrieved November 22, 2020.
- Illinois Department of Transportation (1977). Illinois Highway Map (Map). [1:772,500]. Springfield: Illinois Department of Transportation. Retrieved November 22, 2020 – via Illinois Digital Archives.
- Illinois Department of Transportation (1979). Illinois Highway Map (Map). [1:772,500]. Springfield: Illinois Department of Transportation. Retrieved November 22, 2020 – via Illinois Digital Archives.
- Staff (September 2007). "Executive Summary". Congestion-Relief Program Summary (PDF) (Report). Illinois State Toll Highway Authority. pp. 3–6. Archived from the original (PDF) on September 27, 2011. Retrieved February 28, 2011.
- Staff (May 5, 2009). "Washington Street to Finley Road Rebuild & Widen Project & Naperville Road Interchange" (PDF). Reagan Memorial Tollway. Illinois State Toll Highway Authority. Retrieved September 20, 2014.
- Staff (December 2, 2009). "Aurora Toll Plaza to Orchard Road Rebuild & Widen Project" (PDF). Reagan Memorial Tollway. Illinois State Toll Highway Authority. Retrieved September 20, 2014.
- "I-88 Rebuild and Widen Project" (PDF). Reagan Memorial Tollway. Illinois State Toll Highway Authority. Retrieved September 20, 2014.
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