So I suppose this sign at a rest stop (with one of the best views in the state of Minnesota) means that it is perfectly safe and acceptable to feed ring-billed gulls, herring gulls, Franklin's gulls or any other type of gull that shows up, so long as it is not a seagull. It's odd that seagulls would be such a problem just off of a lake.
I took this photo on one of my many trips up to Duluth to go hawk trapping. I was reminded of it by the sign in featured in a post at Ohio Birding Blog. Now, I wonder if this sign is referring to the small furry variety or to birders?