Interstate 155 in Illinois


Get started Lincoln
End Peoria
Length 32 mi
Length 52 km

Interstate 155 or I -155 is an Interstate Highway in the US state of Illinois. Unlike many 3-digit Interstates, I-155 is a rural highway, running from Interstate 55 at Lincoln to Interstate 74 at Peoria and is 32 miles long.


The highway was built over the right-of-way of State Route 121, and road safety deteriorated after traffic increased between Peoria and Springfield. The first section opened on December 15, 1989 between I-55 at Lincoln and the Hartsburg exit. The rest of the highway opened on October 29, 1992. It eventually cost $130 million, or $2.5 million per mile.

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Lane Configuration

From Unpleasant Lanes Comments
exit 0 Exit 31 2×2


Congestion is uncommon on I-155, the highway has low traffic volumes and is rarely busy.

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Connections & traffic intensities

# destination AADT
0 Chicago, Lincoln, St. Louis 9,600
6 Hartsburg 9.400
10 McLean, Havana 9,800
15 Delavan 11,000
19 hopedale 12,600
22 Townline Road 13,600
25 Peking, Bloomington 18,100
28 Broadway Road 17.100
29 Morton, Main Street 19,000
30 Morton, Queenwood Road 20,000
31 Morton, Birchwood Street 20,000
32 Peoria, Bloomington

Illinois State Toll Highway Authority

The Illinois State Toll Highway Authority (ISTHA), often referred to simply as the Illinois Tollway, is the public administrator of toll roads in the U.S. state of Illinois. ISTHA operates a number of toll roads in the northeast of the state, in and around the Chicago area. ISHTA operates 5 toll roads in 12 counties with a total length of 473 kilometers.


In 1941, the Toll Highway Authority was established, tasked with developing toll roads in Illinois. Chicago was one of the largest cities in North America at the time, but did not yet have highways like those built in the New York area and Pennsylvania at that time. However, the outbreak of World War II delayed the construction of toll roads. In 1953, the Illinois State Toll Highway Commission, which began building the first toll roads in the region.

In 1958, the region’s first three toll roads opened, namely the Jane Addams Memorial Tollway (I-90) between Rockford and Chicago, the Tri-State Tollway (I-80, I-94 and I-294) as a bypass of Chicago and the first section of the Ronald Reagan Memorial Tollway (I-88) west of Chicago. However, the creation of the Interstate Highway system with federal funding in 1956 made further large-scale construction of toll roads in Illinois less urgent.

In 1968 the Illinois State Toll Highway Commission merged into today’s Illinois State Toll Highway Authority. Since then, there have been a number of minor system expansions, most notably the extension of I-88 as a toll road to Dixon in 1970 and the construction of Interstate 355 in the Chicago suburbs in 1989. Later on, the focus was mainly on capacity expansions of the existing toll roads. It never came from a state wide network of toll roads in Illinois, all toll roads are around Chicago.

Toll roads

Name Route Length
Jane Addams Memorial Tollway Rockford – Chicago suburbs 126 km
Veterans Memorial Tollway Chicago suburbs 52 km
Ronald Reagan Memorial Tollway Chicago – Dixon 155 km
Tri-State Tollway Chicago bypass 126 km
Elgin–O’Hare Tollway Chicago suburbs 16 km

Illinois Tollway oasis

An Illinois Tollway oasis is a type of service area on the Illinois Tollway that offers all commercial services such as gas stations and restaurants, unlike Interstate Highways where that is not allowed. There were originally 7 of these, two of which close to Chicago have been demolished due to the widening of the toll roads. Six of the seven oases were a bridge restaurant. They are typical of the Illinois Tollway, although bridge restaurants are sporadic elsewhere in the country.

Toll collection

Tolling as it existed until 2020, with open road tolling on the main carriageway and a toll station for cash payments on the right.

The Illinois Tollway originally had the classic toll gate charge . There was an open toll system where people had to pay tolls at several mainline toll plazas and exits, with the exception of the Jane Addams Memorial Tollway, which had a closed ticket system. In 1958 tolls were $0.25 at mainline toll plazas and $0.10 at exit ramps. In 1983 this was increased to $0.40 and $0.15. In 1993 the electronic toll system I-Pass was introduced and in 2005 the cash rates were doubled to $0.80 and $0.30. In 2012, tolls were increased to $1.50 cash. A rush hour charge was also introduced for freight traffic.

The electronic toll system I-Pass was later transformed into open road tolling, where traffic no longer has to slow down. Fully electronic toll collection started in March 2020, because of the coronavirus outbreak, cash payments were no longer accepted. On February 25, 2021, the Illinois Tollway announced that this was becoming permanent.

The E-ZPass is also accepted by the Illinois Tollway.

Interstate 155 in Illinois