I was very impressed with the public transit in South Korea, especially the train and subway network. I could get just about anywhere I needed to go using various trains and subways, all of which seemed very high tech to me. Plus they have one transit card that can be used for busses, cabs, trains, subways, etc. and can be loaded at any gas station or transit terminal. Just touch the card to the reader when you get on and again when you get off.