even if the cops in chi town cared to even pull you over they will just take some money and be on their way:deviousHere in Chicago, it's illegal. With that said, I lane split on every single ride. Never been ticketed for it and a few cops have seen me do it, but they never payed me any mind.
I'm all for lane splitting, personally. Like any other aspect of riding, there is a certain level of caution one must excersice while doing it.
I have been on both sides of the asshole/safe rider coin. On the asshole side, I've lane split with a large group of riders at 140+mph. On the other side, I've been in bumber to bumper grid lock traffic and lane split at 10-15mph just to get through the shit.
I'm not proud of the asshole side and MOST of those days are past me but like I said before, lane splitting is a great idea that is useful if done responsibliy.