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This is THE Worlds Largest Forum devoted to the Norfolk Broads, here you can discuss issues about the Norfolk Broads. Or just somewhere to chat with others interested in the Norfolk Broads area. In 2015 forum members spent 2,048 days afloat on the Broads
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.)