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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 state of Illinois uses exit numbers on three freeways, on Illinois Route 6 (IL 6) between in Peoria, IL 390 in the northwestern suburbs of Chicago, and IL 255 in the suburbs of St. Louis. The state of Indiana uses exit numbers on two highways with freeway segments, on US 31 between Indianapolis and South Bend and SR 912 in northwest Indiana.
Inventory Route Number sign near Jacksonville IL (Morgan County) on US-67. Illinois uses unique "inventory number" signage on rural roads that are owned or maintained by IDOT but may or may not be part of the US or Illinois highway systems. These number signs are white squares, with a green divided circle.
Eastbound exit and westbound entrance; last free exit eastbound: Western end of Toll Road: 154.95: 249.37: 155: I-294 Toll north (Tri-State Tollway) – Wisconsin: Western end of I-294 concurrency; I-294 exit 5; tollway concurrency uses I-294's exit numbers: Tri-State Tollway Barrier: East Hazel Crest: 156.11: 251.23: 4: Dixie Highway ...
The route numbers and locations are coordinated by the American Association of State Highway and Transportation Officials (AASHTO). [4] The only federal involvement in AASHTO is a nonvoting seat for the United States Department of Transportation. Generally, most north-to-south highways are odd-numbered, with the lowest numbers in the east and ...
On a road with distance-based exit numbering, the exit number (shown here on a gore sign) matches a nearby mile or kilometer marker. Puerto Rico is the only place in the United States that uses Spanish like the "Salida 5B" sign. An exit number is a number assigned to a road junction, usually an exit from a freeway. It is usually marked on the ...
A route (or road) number, designation or abbreviation is an identifying numeric (or alphanumeric) designation assigned by a highway authority to a particular stretch of roadway to distinguish it from other routes and, in many cases, also to indicate its classification (e.g. motorway, primary route, regional road, etc.), general geographical location (in zonal numbering systems) and/or ...
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] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest is Interstate 41 at 0.90 miles (1.45 km).