In Chicago, the public transportation is called CTA. You have to pay about $2 each time you using it. It might be just a little for many people but if you compare back to Thai baht, you can but two dishes of food. And if you take Thai bus in Bangkok, you have to pay about 10 Baht, which is approximate $0.33 only. Another admirable thing about CTA is its system that links between bus and train very smoothly. Lastly, you can check the bus schedule online viawww.ctabustracker.com, which can help you save a bunch of time. Bravo!