Luckily most businesses around my area are not posted. In the past year, I've seen more than a handful of places remove the GFZ sticker. So in reality, there's not many places I can't carry, on a day to day basis. Besides work At the park... well, no comment. But I'll do anything to protect my kid. There hasn't been a test case yet, where someone got caught carrying where they shouldn't. Even then you don't lose your CCL, just get a fine and misdemeanor.
Unfortunately we have anti-groups that consist of retired people, who go to gun shops and protest (3-5 people). When they're not doing that, they go around the nice suburbs that barely have any crime and encourage (more like bully) business owners to put up a GFZ sticker. The local news paper publishes the retarded articles this organizer writes, like "Less gun laws in IL (CCL) causes more deaths". They are not even ashamed to say they're targeting law abiding citizens. When they protested at a grand opening of a Portillo's (restaurant), because the owner supports 2A and refuses to put up GFZ, the owner told them to go pound sand.
This year looks like a uphill battle for IL, we only got 1 bill (Pro gun) for the whole year, legalize suppressors. And it's already off to a rocky start, cause people that don't even live in IL, are voicing their concerns. Meanwhile, we currently have 3-4 anti-gun bills. Ammo serialization, Gun Dealer Bill (adds massive restrictions to gun stores and increase cost of operation), and terrorist watch list. Pretty sure I'm missing one more, but you get the idea. Constant battle.
As far as the traffic, yeah that would be a concern. I'm pretty good with alternative routes, my wife... not so much lol... She would easily get lost, even around here Cause ideally, we'd like to be near an interstate. Right now in IL, to travel 20 miles in rushhour, could take 60-90 minutes. But they recently expanded I90, so that seems to have helped.