SBS Transit
Until the introduction of the Bus Contracting Model (BCM), SBS Transit operated the majority of routes in almost all areas of Singapore, with the notable exception of the North and Northwest areas, where bus services were mainly run by SMRT Buses. However, with the introduction of the BCM, some SBS Transit bus services were taken over by Tower Transit Singapore (Bulim Bus Package) and Go-Ahead Singapore (Loyang Bus Package). As of May 2021, there are 227 wheelchair-accessible bus services that SBS Transit operates.