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, the creator of this image, hereby release it into the public domain. If that cannot be done for any reason including bureaucratic garbage, I release it 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.)
Interstate 72 is an interstate highway in the midwestern United States. ... The Dubuque-Wisconsin Bridge, Dubuque, Iowa. ... Missouri 366 in St. ... Downtown Dubuque with Julien Dubuque Bridge in background The Julien Dubuque Bridge traverses the Mississippi River. ... A view of the bridge from Riverview Park, Dubuque The Dubuque-Wisconsin Bridge connects Dubuque, Iowa, with Grant County, Wisconsin. ... Interstate 310 (abbreviated I-310) is a short spur route of Interstate 10 near New Orleans, Louisiana. ... The Black Hawk Bridge spans the Mississippi River, joining the town of Lansing, in Allamakee County, Iowa, to rural Crawford County, Wisconsin. ... The Marquette-Joliet Bridge that traverses the Mississippi River, connecting Marquette, Iowa, with Prairie du Chien, Wisconsin. ...