 The Leap card, introduced in December 2011, is a smart card that can be used on Dublin Bus, DART, suburban rail services in the Dublin area and the Luas.In addition to Dublin Bus, a number of private operators provide services to Dublin Airport from all over the city and a small number of suburban routes are also provided by independent companies.The "Real Time Passenger Information Service" is available across Dublin, and provides real time estimates of bus arrivals at each stop, based on GPS locations of buses.