35 speed limit zone ahead sign, R2-4, California.  Self made based on CALTRANS sign drawing.
No machine-readable author provided. <a href="//commons.wikimedia.org/w/index.php?title=User:Overpush~commonswiki&amp;action=edit&amp;redlink=1" class="new" title="User:Overpush~commonswiki (page does not exist)">Overpush~commonswiki</a> assumed (based on copyright claims).
No machine-readable source provided. Own work assumed (based on copyright claims).