Red buses or express buses are the quickest of the group for a wide area line since they make fewer stops. These buses are the most comfortable and are designed to seat every passenger on the bus. Express buses come in various colors; the main purpose is to provide commuters easier access to neighboring cities such as Ilsan, Bundang, Suji, Suwon, Anyang, and Incheon. Express buses are labeled with a four-digit number on the front, side, and back.