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This is a list of U.S. Highways in Illinois, all of which are owned and maintained by the U.S. state of Illinois. The Illinois Department of Transportation (IDOT) is responsible for maintaining the U.S Highways in Illinois. The system in Illinois consists of 20 primary highways.
Illinois's state route numbers originated in 1918 as State Bond Issues 1 through 46, used to finance the new roads. The numbers of the bond issues were then used to mark the highway routes along the way. Another series of bond issues were authorized in 1924 (47–185) and again were used to mark the roads they paid for.
Illinois Route 72 cross-sign mounted on a stoplight in Hoffman Estates. SBI Numbers are still used for several purposes, even when they do not match the posted number. IDOT District maps still refer to SBI numbers on the various roads it maintains, along with other non-posted designations that refer to how the route was authorized.
The first Pennsylvania Department of Highways road maps were issued in September 1912, per "First Map Showing the State Roads". Harrisburg Telegraph . September 26, 1912. p. 7.
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]
Pages in category "Lists of roads in Illinois" The following 6 pages are in this category, out of 6 total. This list may not reflect recent changes. C.
Given are the years of the first and last official maps the routes appear on (or when the route was legislated, in the case of SBI routes: original 1917 definitions, approved by voters in 1918; 47-185 from 1923 (pp. 258-268), approved in 1924). These are not always the exact years the routes were created or eliminated.
Historic trails and roads in Illinois (2 C, 11 P) R. Road incident deaths in Illinois (66 P) S. State highways in Illinois (3 C, 163 P) Streets in Illinois (2 C, 5 P) T.