This is a file from the Wikimedia Commons. The description on its description page there is shown below.
Image File history File links Commons-logo. ...
I, SPUI, the creator of this image, hereby release it into the public domain. If that cannot be done for any reason, including the nonexistence of a way to release a work into the public domain, I release it (or my changes in the case of a derivative work) under the following license:
This image is copyrighted. The copyright holder has irrevocably released all rights to it, allowing it to be freely reproduced, distributed, transmitted, used, modified, built upon, or otherwise exploited in any way by anyone for any purpose, commercial or non-commercial, with or without attribution of the author.
600 mm by 600 mm (24 in by 24 in) U.S. Route shield, made to the specifications of the 2004 edition of Standard Highway Signs. (Note that there is a missing "J" label on the left side of the diagram.) Uses the Roadgeek fonts. (United States law does not permit the copyrighting of typeface designs, and the fonts are meant to be copies of a U.S. Government-produced work anyway.)
// Summary The Kentucky Revised Statue 177. ... See also U.S. 41 U.S. 45 Illinois State Route 43 is a major north-south state road that runs from the large intersection of Illinois State Route 120 (Belvidere Road) and U.S. Highway 41 (Skokie Highway) in Waukegan south through the city of Chicago to U.S... See also Interstate 55 Interstate 57 Illinois Route 56 is a state road that runs from the interchange of Illinois Route 47 at U.S. Route 30 in Sugar Grove east to the multiplexed US 12/US 20/US 45 combination (Mannheim Road) by Bellwood, distance of 34 miles (55... See also U.S. 45 Illinois Route 47 is a rural north-south state highway that runs from the Wisconsin state border at Wisconsin State Highway 120 near Hebron, to Illinois Route 10, just south of Interstate 72 near Seymour. ... Interstate 290 (abbreviated I-290) is the main Interstate highway due westward from the Chicago Loop. ... See also Interstate 39 U.S. 40 Illinois Route 38 is an east-west state road that runs across northern Illinois. ... The following bannered highways have existed: Defunct routes are listed in italics. ... Illinois Route 116 is a long, cross-state rural state highway that runs from U.S. Route 34 by Gladstone just west of the Great River Bridge east to the intersection of U.S. Route 45 and Old U.S. Route 45, on the north side of Ashkum. ... Interstate 88 (abbreviated I-88) is an interstate highway entirely within the state of Illinois. ... MAJOR JUNCTIONS JUNCTION EXIT # Western Terminus U.S. 12/45 Mile 1. ...