Route 66 Please refer to the link below for copyright information: https://commons.wikimedia.org/wiki/File:US_66_(1961_cutout).svg It states: This file is in the public domain because it comes from the California Manual on Uniform Traffic Control Devices, sign number G26-2 (CA), which states specifically in its introduction, on page 54 that: Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain. Traffic control devices contained in this Manual shall not be protected by a patent, trademark, or copyright, except for the Interstate Shield and any items owned by FHWA. The California Department of Transportation logos consisting of the “CT” symbol and the “Caltrans” logotype are registered service marks and when used on any traffic control device they shall be presented in a uniform and consistent manner as outlined in the Department’s Deputy Directive DD-33-R1.