Transformers 4 Remember Chicago Billboard

A billboard found by @JFall in the Granger, Texas area asks that drivers "Remember Chicago". The sign is part of the filming going on in the state and in one glance reinforces that Transformers 4 takes place 4 years after the events of Dark of the Moon. It might hint at part of the story of the movie as it seems to suggest that maybe no aliens, including Autobots, are welcome on the planet. Thanks to Sam N. for the link. Photo credit: @jfall