SMRT Buses, originally Trans Island Bus Services (TIBS), is a public bus transport operator in Singapore. Before the Government Contracting Model was introduced, Singapore had a duopoly transport system in which SMRT's only competitor was SBS Transit, which also operates bus services in Singapore. The company was incorporated as TIBS on 31 May 1982, in a heavily regulated market, to be a competitor to Singapore Bus Service. In accordance with restructuring at parent company SMRT Corporation, TIBS was renamed "SMRT Buses" on 10 May 2004 along with the subsequent merger of City Shuttle Service.