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The county name is within the dividing line, the mileage from the county line is in the lower half and the inventory or route number in the upper. Number series vary between IDOT Districts, in some areas the number used on otherwise unnumbered routes are a derivative of the former number (i.e.: "913" used on a section of former IL 13) or a ...
All known numbered Illinois state routes; Notable non-Interstate highways (Elgin-O'Hare Expressway, Kingery Highway) Interstate and U.S. Route state-level detail pages (U.S. Route 20 in Illinois) Lists of Illinois county highways (List of County Highways in DuPage County, Illinois) Historical road trails (Lincoln Highway, Cannon Ball Route)
Bridge weight plates refer to SBI numbers instead of posted route numbers as well. For example, bridge plates along old US-66 refer to the route as "SBI-4" When the United States Numbered Highway System was started in 1926, the US numbers were just tacked onto the existing IL/SBI number unless the US Route was routed along a new route.
In addition, although concurrencies of county highways exist in the county, they too are not explicitly signed as such. County Highways 47, 48, 49, 55 and 57 all refer to segments of the Illinois Prairie Path and the Great Western Trail, major bike trails through DuPage County. No motorized traffic is allowed on these trails/highways.
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes Temp. US 6 — — Moline: Joliet — — US 6 Bus. — — Lansing: Illinois–Indiana state line — — City US 12 — — — — 1938: 1960 Served Chicago: US 12 Bus. — — — — 1960: 1968 Served Chicago: US 20 Bus. — —
The shorter auxiliary routes branch from primary routes; their numbers are based on the parent route's number. All of the supplement routes for Interstate 95 (I-95) are designated with a three-digit number ending in "95": I-x95. With some exceptions, spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and ...
The Illinois Department of Transportation (IDOT), Illinois State Toll Highway Authority (ISTHA), and Skyway Concession Company (SCC) are responsible for maintaining these highways in Illinois. The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km). [2]
0–9. Illinois Route 1; Illinois Route 2; Illinois Route 3; Illinois Route 4; Illinois Route 5; Illinois Route 6; Illinois Route 7; Illinois Route 8; Illinois Route 9