Signs are terrible indicator
North Alabama here.
People don’t put signs out because liberals here are the same that they are everywhere else in this country. Some of them have no reservations about getting mean, nasty, and violent towards people that they disagree with. Nobody needs that. So no signs required, just vote.
In 16 they were a pretty good indicator in Indiana. Many many many Trump signs and a few Hillary for Prison signs. Heck my sign was about 10 foot by 4 foot, and I wasn’t the only one in the neighborhood with the big sign either.