The domestic transport infrastructure has a well-connected island-wide road transport system which includes a network of expressways. The public road system is served by the nation's bus service and a number of licensed taxi-operating companies. The public bus transport has been the subject of criticism by Singaporeans[citation needed], the majority of whom are dependent on it for their daily commuting.
Since 1987, the heavy rail passenger Mass Rapid Transit (MRT) metro system has been in operation. The MRT system has been further augmented by the Light Rail Transit (LRT) light rail system, and increases accessibility to housing estates. Established in 2001, the EZ-Link system allows contactless smartcards to serve as stored value tickets for use in the public transport systems in Singapore.