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 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) stop sign, made to the specifications of the 2004 edition of Standard Highway Signs (sign R1-1). Uses the Roadgeek 2005 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.) Colors are from [1] (Pantone Red 187), converted to RGB by [2]. The outside border has a width of 1 (1 mm) and a color of black so it shows up; in reality, signs have no outside border.
Stop sign used in English-speaking countries, as well as in the European Union Former European stop sign consisting of red Give Way triangle inside a circle A stop sign is a traffic sign, usually erected at road junctions, that instructs drivers to make a brief and temporary, but complete...