It has been recently put up next to the Grand Avenue service center. Look for it. Makes me very happy as it is the exact configuration of my car. :smile:
The image used for this billboard is cropped from a photo recently featured on TM's website, taken in Dubai -see this thread: [Speculation] Tesla expanding to Dubai
Yes, it's not technically an advertisement. It just shows where the service center is. But still, you can see it from the highway driving into the city of Chicago, so for all intents and purposes it's advertising Tesla. I'll try to take a photo from the I-90 expressway next time I'm there.