Are these actually used, or is this made up?
Green film over yellow? Seriously?
http://www.ebay.com/itm/California-Highway-1-Alt-route-road-sign-UNUSED-DOT-specs-traffic-highway-/291079228382?pt=LH_DefaultDomain_0&hash=item43c5ac8bde (http://www.ebay.com/itm/California-Highway-1-Alt-route-road-sign-UNUSED-DOT-specs-traffic-highway-/291079228382?pt=LH_DefaultDomain_0&hash=item43c5ac8bde)
Looks like a town issue.
It isn't a Caltrans sign, that is certain. Either way, it is an odd one.