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You fool! They're for people carrying blind people, so they can use the carpool lane.
(I hope that this post does not offend blind people - of which I consider one to be a friend, who told me the only "Blind Person" joke I ever heard (which was very good), or offend people who use carpool lanes (which I have done myself), or Californians.) (OK.. maybe Californians.)
Believe it or not that is a recognised road sign! We used to put them up around Birmingham at toad crossing places when I worked for the Wildlife Trust!