English:
Based off pictures found at the following links:
[1]
;
[2]
. A pre-1956 Specification Arizona State Route Shield, traced from a picture of a real shield.
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 other items owned by FHWA.
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