Coming from Boulder to Chicago, the difference is insane. The drivers in Chicago are, by and large, a "me first" crowd. They cut off other cars by driving in the bike lanes. Even Chicago's police regularly park and drive on bike lanes, setting an excellent example for the citizens to follow. Delivery vehicles think nothing of blocking a bike lane. But the issue doesn't end with bad drivers. The city streets are so littered with signs (business signs, parking, no parking, street sweeping, snow route, speed limit, school zone, bus stop, pedestrian crossing, tow zone, one way, no left turn, and then two names plus a state route for some streets!) that it is impossible to read them all, making it very likely that you'll miss an important one (was that a stop sign?!?). Lanes appear and disappear without warning. Did I miss a sign that said this lane was ending? No -- there is no sign. (There was no room for that sign.) And some stop lights are placed where it is almost impossible to see until it is too late to stop. It's really insane. And the natives have no clue how bad it is. Drivers are so distracted by the insane signage and roads, that a bicyclist will get lost in the noise.