All 智能卡读卡器s at rail stations are set at default fare settings used by the majority of passengers at that station. In this instance, you do not need to select a fare level. If you are traveling to a location other than the default setting, you must select the level of service (Local, 区域, or 机场) that corresponds to the station to which you are traveling. Signage is located at all rail stations behind each card reader to help you determine which level of service you should select for your trip.