Interstate 155 (Illinois)
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| Route information | ||||
| Maintained by IDOT | ||||
| Length: | 32.13 mi (51.71 km) | |||
| Existed: | December 15, 1989 – I-55 to Hartsburg October 29, 1992 – Full opening – present |
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| Major junctions | ||||
| South end: |
 I-55 in Lincoln
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 US 136 in Emden
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| North end: |
 I-74 in Morton
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| Highway system | ||||
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Interstate 155 (I-155) is a north–south spur of Interstate 55 that provides an interstate connection for the Illinois cities of Peoria and Lincoln. The northern terminus for the interstate is just east of Peoria, at Interstate 74 exit 101 in Morton. The southern terminus, which is northwest of Lincoln, is located on I-55 at exit 127. The interstate is 32.13 miles (51.71 km) long.
I-155 was created to replace Illinois Route 121 (abbreviated IL 121). Prompted by safety concerns at a major intersection near Morton, state transportation officials replaced the entire route with a limited-access freeway. The interstate was built in several segments from 1970 to 1992, a period that included a ten-year delay due to a lawsuit over right-of-way. I-155 fully opened to traffic on October 29, 1992.
Interstate 155 runs north from Interstate 55 just northwest of Lincoln, intersecting U.S. Route 136 east of Emden. 5 miles (8 km) north of U.S. 136, eastbound Illinois Route 122 joins I-155 traveling north, directly east of Delavan. The two highways run concurrent for 4 miles (6 km) before Illinois 122 runs east to Hopedale. Further north, the highway crosses the Mackinaw River beside a steel truss bridge serving old Illinois Route 121.
East of Tremont, I-155 intersects Illinois Route 9. 4 miles (6 km) later is Main Street, the first of three northbound exits to Morton. (There are only two southbound exits, at Queenwood Road and Illinois Route 98 – Birchwood Street). The highway passes to the west of Morton before intersecting Interstate 74 at a trumpet interchange about 8 miles (13 km) southeast of downtown Peoria.
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