History of Services 1 - 10

Service 1

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Changi Point Ter and Havelock Rd Ter under 1971 Bus Reorganisation.
	1973	11 March	Amended to ply Zion Rd towards Havelock Rd Ter with the partial conversion of Kim Seng Rd to one-way road.
		1 November	Operated by Singapore Bus Service (SBS).
	1974	1 December	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
		8 December	Amended to skip Market St.
	1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Havelock Rd Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way road.
		2 March	Amended to ply Sims Ave towards Changi Point Ter with the conversion of Geylang Rd to one-way road.
		25 May	Amended to ply Bedok Walk and New Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
		TBC	Amended to the relocated Changi Point Ter.
		14 November	Amended to ply New Upp Changi Rd.
	1979	14 October	Amended to ply Sims Ave East towards Changi Point Ter with the conversion of Changi Rd to one-way road.
		11 November	Amended to Delta Fringe Car Park.
	1980	20 January	Amended to ply Spottiswoode Park Rd with the partial conversion of Cantonment Rd to one-way road.
	1981	TBC	Ceased to operate on Sundays and public holidays.
		15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
	1989	5 November	Withdrawn.

Service 1A

Operator	Year	Date	Service changes
Associated Bus Service	1971	1 August	Introduced between Changi Point Ter and Havelock Rd Ter.
	1973	11 March	Amended to ply Zion Rd towards Havelock Rd Ter with the partial conversion of Kim Seng Rd to one-way road.
		1 November	Operated by Singapore Bus Service (SBS).
	1974	3 February	Re-numbered Service 3 under 1974 Bus Rationalisation.

Service 2

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Changi Point Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	1973	1 November	Operated by Singapore Bus Service (SBS).
	1974	1 December	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
	1975	2 March	Amended to ply Sims Ave towards Changi Point Ter with the conversion of Geylang Rd to one-way road.
		25 May	Amended to ply Bedok Walk and New Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
		TBC	Amended to the relocated Changi Point Ter.
		14 November	Amended to ply New Upp Changi Rd, skipping Bedok Plain and Bedok Walk.
	1979	14 October	Amended to ply Sims Ave East towards Changi Point Ter with the conversion of Changi Rd to one-way road.
	1980	28 December	Amended to ply Jln Bt Merah and Kg Bahru Rd in both directions, skipping Outram Rd, Tiong Bahru Rd, Henderson Rd.
	1981	15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
	1982	TBC	Amended to Buona Vista Ter.
	1987	27 September	Amended to ply the extended Eu Tong Sen St towards Changi Village Ter to facilitate the first stage of road expansion along New Bridge Rd.
		1 November	Amended to ply Eu Tong Sen St towards Changi Village Ter to facilitate the second stage of road expansion along New Bridge Rd.
	1992	29 November	Shortened to New Bridge Rd Ter under TransitLink Network Integration Exercise Phase 10 to avoid duplication with service 147, 196 and 198. At the same time, Bukit Batok depot allocation was withdrawn.
	1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Neil Rd.
		TBC	Converted from non-aircon service to partial aircon service.
	1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
	1997	7 December	Amended to ply South Bridge Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
	1998	TBC	Converted to fully air-con service.
Template:SBS Transit	2001	1 November	Operated by SBS Transit.
	2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping South Bridge Rd.
	2007	22 May	Designated wheelchair-accessible bus service (WAB).
	2013	29 December	Amended to ply Upp Changi Link with the partial closure of Upp Changi Rd.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operated by Go-Ahead Singapore.

Service 2A

Operator	Year	Date	Service changes
Associated Bus Service	1971	1 August	Introduced between Changi Point Ter and Commonwealth Ave Ter.
	1973	1 November	Operated by Singapore Bus Service (SBS).
	1974	3 February	Withdrawn under 1974 Bus Rationalisation.

Service 3

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1974 - 1991)	1974	3 February	Re-numbered from Service 1A as a service between Changi Point Ter and Havelock Rd Ter.
			1 December	Amended to ply New Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
		1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Havelock Rd Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way road.
			2 March	Amended to ply Sims Ave towards Changi Point Ter with the conversion of Geylang Rd to one-way road.
			25 May	Amended to ply Bedok Walk and New Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
			TBC	Amended to the relocated Changi Point Ter.
		1976	15 July	Amended to ply Upp Changi Rd, skipping Telok Paku Rd and Nicoll Dr.
		1977	27 February	Shortened to Bedok South Rd Ter.
		1979	8 April	Amended to Bedok Int. At the same time, shortened to loop at New Bridge Rd and converted to a semi-express service.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way road.
		1983	27 November	Integrated with Service 6 and amended to ply Kallang Rd/Crawford St and Victoria St/North Bridge Rd.
		1986	12 January	Converted to trunk service.
		1987	26 January	Extended to Jurong East Int.
			27 September	Amended to ply the extended Eu Tong Sen St towards Bedok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Bedok Int to facilitate the second stage of road expansion along New Bridge Rd.
		1988	20 March	Amended to ply Upp Cross St and New Bridge Rd, skipping Neil Rd.
		1991	6 January	Withdrawn under TransitLink Network Integration Exercise Phase 1.
Template:SBS Transit	2nd Gen (2002 - present)	2002	7 April	Re-introduced between Tampines Int and Pasir Ris St 71 (loop) with the integration of Services 294 and 357.
		2003	19 October	Extended to loop at Punggol Central.
			30 November	Amended to Punggol Temp Int.
		2009	5 September	Calls at a new pair of bus stops outside Blk 231A CP and outside Blk 485 along Pasir Ris Dr 4.
			26 October	Designated wheelchair-accessible bus service (WAB).
		2012	29 April	Calls at a new bus stop outside Blk 612 along Pasir Ris Dr 1.
		2014	24 August	Calls at a new pair of bus stops before and after Punggol Rd along TPE.
		2015	12 December	Amended to ply the extended Pasir Ris Dr 8 with the permanent closure of the west ring of Pasir Ris Central.
Template:Go-Ahead Singapore (Current)		2016	4 September	Operated by Go-Ahead Singapore.
		2017	21 October	Calls at a new pair of bus stops outside Tampines East Stn along Tampines Ave 2.

Service 4

Operator	Service Gen	Year	Date	Service changes
Associated Bus Service	1st Gen (1971 - 1974)	1971	11 April	Introduced between Changi Point Ter and Lloyd Leas Estate (loop) under 1971 Bus Reorganisation.
		1973	1 November	Operated by Singapore Bus Service (SBS).
		1974	3 February	Withdrawn under 1974 Bus Rationalisation.
	2nd Gen (1979 - 1993)	1979	11 March	Re-introduced between Bedok Int and Lor 1 Geylang (loop).
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way road.
		1980	TBC	Extended to loop at Moulmein Rd.
		1988	31 July	Extended to St. Michael's Ter.
		1990	10 March	Integrated with Service 19 and extended to Pasir Ris Int.
		1992	29 November	Shortened to Tampines Int under TransitLink Network Integration Exercise Phase 10.
		1993	23 May	Integrated with Services 21 and 67 and withdrawn under TransitLink Network Integration Exercise Phase 13.
Template:SBS Transit (Current)	3rd Gen (2013 - present)	2013	17 March	Re-introduced between Tampines Int and Changi North Way (loop) under the LTA's Bus Service Enhancement Programme (BSEP).
			31 March	Designated wheelchair-accessible bus service (WAB).

Service 5

Operator	Service Gen	Year	Date	Service changes
Amalgamated Bus Company	1st Gen (1971 - 1999)	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
		1972	11 June	Amended to ply the extended Upp Cross St with the partial conversion of Havelock Rd to one-way road, skipping New Bridge Rd.
		1973	TBC	Extended to Bt Timah Ter.
			1 November	Operated by Singapore Bus Service (SBS).
		1974	3 February	Shortened to Chai Chee Ter under 1974 Bus Rationalisation.
		1975	2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way road.
		1977	17 October	Shortened to Geylang Fringe Car Park and amended to ply Lavender St, Kallang Bahru, Boon Keng Rd and Lor 1 Geylang.
		1979	30 December	Amended to ply Jln Anak Bt towards Geylang Fringe Car Park with the partial conversion of Upp Bt Timah Rd to one-way road.
		1986	1 June	Extended to Zhenghua Ter.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Lor 1 Geylang Ter to facilitate the first stage of road expansion along New Bridge Rd.
			11 October	Amended to Bt Panjang Ter.
			1 November	Amended to ply Eu Tong Sen St towards Lor 1 Geylang Ter to facilitate the second stage of road expansion along New Bridge Rd.
		1992	29 March	Amended to ply Holland Ave, C'wealth Ave, Margaret Dr, Alexandra Rd, Lower Delta Rd, Jln Bt Merah, Kg Bahru Rd and Eu Tong Sen St/New Bridge Rd under TransitLink Network Integration Exercise Phase 6, skipping Queensway, C'wealth Ave, Alexandra Rd, Ganges Ave and Havelock Rd.
		1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Upp Cross St.
		1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
Trans-Island Bus Service		1995	17 September	Operated by Trans-Island Bus Service (TIBS).
		1997	7 December	Amended to ply South Bridge Rd and Neil Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
		1999	26 December	Withdrawn under Bukit Panjang LRT Rationalisation.
Template:SBS Transit (Current)	2nd Gen (2007 - present)	2007	11 March	Re-introduced between Pasir Ris Int and Bt Merah Int.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
			28 August	Amended to ply Jln Tenaga and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of Kaki Bukit MRT station on the Downtown MRT Line.
		2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga and Jln Damai.

Service 6

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1977 - 1983)	1977	11 July	Introduced between Chai Chee Ter and North Bridge Rd (loop) as a semi-express service.
		1979	25 February	Amended to Bedok Int.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way road.
		1983	27 November	Integrated with Service 3 and withdrawn.
	2nd Gen (1993 - present)	1993	25 October	Re-introduced between Pasir Ris Int and Loyang Cres (loop) as a peak hour service on weekdays and Saturdays only.
		1994	24 October	Converted to day service.
Template:SBS Transit		2001	1 November	Operated by SBS Transit.
		2004	20 December	Amended to ply Loyang Way and Loyang Ave towards Pasir Ris Int.
		2013	3 December	Designated wheelchair-accessible bus service (WAB).
Template:Go-Ahead Singapore (Current)		2016	18 September	Operated by Go-Ahead Singapore.

Service 7

Operator	Year	Date	Service changes
	1979	11 March	Introduced between Bedok Int and Holland Rd Fringe Car Park (loop) as a semi-express service, replacing Service 307.
	1983	TBC	Integrated with Service 191 and extended to Clementi Int.
	1985	6 January	Extended to Jurong East Central Ter.
		30 June	Amended to Jurong East Int.
		29 August	Converted to trunk service.
	1989	5 November	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd/Crawford St and Victoria St/North Bridge Rd, skipping Nicoll Highway.
	1991	7 April	Shortened to Clementi Int and amended to ply Clementi Ave 5 under TransitLink Network Integration Exercise Phase 3, skipping Commonwealth Ave West and Clementi Ave 2.
		28 April	Amended to ply Clementi Ave 5 towards Clementi Int under TransitLink Network Integration Exercise Phase 4.
	1998	TBC	Converted from partial air-con service to fully air-con service.
Template:SBS Transit (Current)	2001	1 November	Operated by SBS Transit.
	2002	7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
	2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
		2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd and amended to ply Grange Rd with the partial closure of Somerset Rd.
	2006	29 October	Amended to Clementi Temp Int.
	2007	20 August	Designated wheelchair-accessible bus service (WAB).
	2011	19 November	Amended to Bedok Temp Int.
		26 November	Amended to Clementi Integrated Transport Hub.
	2014	30 November	Amended to Bedok Integrated Transport Hub.

Service 8

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1979 - 1989)	1979	26 February	Introduced between Bedok Int and Shenton Way (loop) as a semi-express service, operating on weekdays and Saturdays only.
			14 October	Amended to ply Sims Ave East towards Bedok Int with the conversion of Changi Rd to one-way road.
		1983	TBC	Amended to ply Bedok South Rd, Bedok South Ave 1 and ECP, skipping Connaught Dr, Collyer Quay, Raffles Quay and Shenton Way.
		1986	30 November	Extended to loop at Raffles Blvd.
		1989	6 November	Withdrawn.
	2nd Gen (1990 - present)	1990	1 March	Re-introduced between Pasir Ris Int and Toa Payoh Int.
		1992	29 November	Shortened to Tampines Int under TransitLink Network Integration Exercise Phase 10.
		1994	5 March	Amended to ply Lor 6 Toa Payoh towards Toa Payoh Int.
		1995	18 September	Amended to ply Tampines Ave 1 and Bedok North Rd with the opening of Temasek Polytechnic.
		1998	31 May	Amended to Toa Payoh Temp Int.
Template:SBS Transit (Current)		2001	1 November	Operated by SBS Transit.
		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2011	4 September	Amended to skip Serangoon Rd towards Toa Payoh Integrated Transport Hub with the permanent closure of Whampoa North.
		2017	12 February	Calls at a new pair of bus stops before and after Ubi Rd 3 along Ubi Ave 2.
			21 August	Designated wheelchair-accessible bus service (WAB).
			21 October	Calls at a new pair of bus stops outside Tampines East Stn along Tampines Ave 2.

Service 9

Operator	Year	Date	Service changes
	1979	9 April	Introduced between Geylang Fringe Car Park and Changi Point Ter, operating on weekdays and Saturdays only.
		14 October	Amended to ply Sims Ave East towards Changi Point Ter with the conversion of Changi Rd to one-way road.
	1981	TBC	Enhanced to operate on Sundays and public holidays.
		15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
	1983	25 June	Integrated with Services 391 and 395 and extended to loop at Changi Airport Cargo Complex under Changi Airport Bus Plan 1983.
	1985	15 December	Amended to ply Loyang Ave, skipping Loyang Way.
	1988	10 April	Amended to ply Upp Changi Rd East, Simei Rd, Tampines Ave 2 and Tampines Ave 7, skipping Bedok Rd and Upp Changi Rd.
	1992	29 November	Shortened to Bedok Int under TransitLink Network Integration Exercise Phase 10.
	1995	15 January	Amended to ply Bedok Rd, Upp Changi Rd, Simei Ave and Simei St 3, skipping Upp Changi Rd East.
	1998	TBC	Converted from partial air-con service to fully air-con service.
Template:SBS Transit (Current)	2001	1 November	Operated by SBS Transit.
	2011	19 November	Amended to Bedok Temp Int.
	2014	30 November	Amended to Bedok Integrated Transport Hub.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2017	21 October	Calls at a new pair of bus stops outside Tampines East Stn along Tampines Ave 2.

Service 10

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Bedok Rd Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
		16 June	Extended to Shipyard Rd Ter.
	1973	1 November	Operated by Singapore Bus Service (SBS).
	1974	TBC	Amended to Upp Changi Rd 13.3km Ter.
		8 December	Amended to skip Market St.
	1978	1 June	Amended to Jurong Int.
	1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
	1980	15 June	Amended to Somapah Int.
	1984	27 April	Extended to Tampines Ave 5 Ter.
	1987	29 November	Amended to Tampines Int.
	1990	1 July	Shortened to Clementi Int with the opening of Boon Lay Int.
	1992	28 June	Amended to ply Tg Katong Rd, Dunman Rd and Old Airport Rd instead of Mountbatten Rd under TransitLink Network Integration Exercise Phase 8 to avoid duplicating with service 14.
	1994	29 May	Calls at 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	1999	7 March	Shortened to Kent Ridge Ter with the introduction of Service 188.
	2000	TBC	Amended to ply Esplanade Dr, skipping Connaught Dr/Empress Pl. At the same time, converted from partial air-con service to fully air-con service.
Template:SBS Transit (Current)	2001	1 November	Operated by SBS Transit.
	2005	2 July	Calls at the bus stop outside Fullerton Square along Fullerton Rd and an additional bus stop opposite AIA Tower along Robinson Rd with the abolition of the bus stop outside Clifford Ctr along Collyer Quay.
	2006	19 March	Amended to ply Guillemard Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of Dakota MRT station on the Circle MRT Line.
		29 October	Calls at a new bus stop outside VivoCity along Telok Blangah Rd.
	2008	7 December	Skips the bus stop opposite Temenggong D Mosque along Telok Blangah Rd.
		29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Guillemard Rd.
	2012	26 March	Designated wheelchair-accessible bus service (WAB).

Service 11

Operator	Service Gen	Year	Date	Service changes
Associated Bus Service	1st Gen (1971 - 1988)	1971	11 April	Introduced between Bedok Rd Ter and Tg Pagar Rd Ter under 1971 Bus Reorganisation.
		1973	1 November	Operated by Singapore Bus Service (SBS).
		1974	3 February	Amended to Upp Changi Rd 13.3km Ter under 1974 Bus Rationalisation.
		1977	23 October	Amended to New Bridge Rd Ter.
		1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
		1980	15 June	Amended to Somapah Int.
		1987	6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Somapah Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Somapah Ter to facilitate the second stage of road expansion along New Bridge Rd.
		1988	23 October	Withdrawn.
	2nd Gen (1990 - present)	1990	14 April	Introduced between Lor 1 Geylang Ter and Stadium Blvd (loop).
		1994	12 June	Amended to ply Stadium Rd before plying Stadium Blvd.
Template:SBS Transit (Current)		2001	1 November	Operated by SBS Transit.
		2002	8 February	Amended to ply Stadium Walk with the partial closure of Stadium Blvd to facilitate the construction of Stadium MRT station on the Circle MRT Line.
		2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
			2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
		2006	18 February	Amended to ply Stadium Cres with the full closure of Stadium Blvd to facilitate the construction of Stadium MRT station on the Circle MRT Line.
		2010	29 September	Amended to ply Mountbatten Rd and Stadium Blvd with the closure of Stadium Rd to facilitate the construction of the Singapore Sports Hub.
		2014	8 June	Extended to loop at Rhu Cross under the LTA's Bus Service Enhancement Programme (BSEP).
			29 September	Designated wheelchair-accessible bus service (WAB).
		2017	23 April	Calls at the bus stops outside and opposite Singapore Indoor Stadium along Stadium Cres/Walk in both directions.

Service 12

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	1973	1 November	Operated by Singapore Bus Service (SBS).
	1974	3 February	Amended to Upp Changi Rd 13.3km Ter under 1974 Bus Rationalisation.
	1975	11 December	Amended to ply New Changi Rd, Bedok Walk, Bedok Plain and Bedok Highway.
	1979	TBC	Relocated to Upp Changi Rd 15.5km.
	1980	15 June	Amended to Somapah Int.
		28 December	Amended to ply Upp Changi Rd East, skipping Upp Changi Rd.
	1982	TBC	Amended to Buona Vista Ter.
	1987	27 September	Amended to ply South Bridge Rd and Eu Tong Sen St, skipping Upp Circular Rd.
	1988	23 October	Extended to Pasir Ris Ter and amended to New Bridge Rd Ter.
	1989	10 December	Amended to Pasir Ris Int.
	1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Upp Cross St.
	1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
	1997	7 December	Amended to ply South Bridge Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
	1998	TBC	Converted from partial air-con service to fully air-con service.
Template:SBS Transit	2001	1 November	Operated by SBS Transit.
	2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping South Bridge Rd.
	2005	5 June	Amended to ply Sims Ave and Sims Way with the partial closure of southbound Mountbatten Rd.
		2 July	Amended to ply Sims Way and Geylang Rd with the partial closure of northbound Mountbatten Rd.
	2006	3 December	Designated wheelchair-accessible bus service (WAB).
	2014	10 August	Calls at a new bus stop opposite Blk 2 along Mountbatten Rd.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operated by Go-Ahead Singapore.
	2017	21 October	Calls at a new pair of bus stops outside Tampines East Stn along Tampines Ave 2.

Service 12A

Operator	Year	Date	Service changes
	1979	31 December	Introduced between Bedok South Ave 3 and North Bridge Rd (loop) as a peak hour variant of Service 12 on weekdays.
	1984	2 September	Withdrawn.

Service 13

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
		9 May	Amended to ply Upp Changi Rd, Changi Rd, Geylang Rd, Kallang Rd, Crawford St, North Bridge Rd and Stamford Rd.
	1973	1 November	Operated by Singapore Bus Service (SBS).
	1974	3 February	Amended to Upp Changi Rd 13.3km Ter under 1974 Bus Rationalisation.
		24 February	Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way road, skipping Orchard Rd and Tanglin Rd.
		1 December	Shortened to Upp Changi Rd Track 6 Ter.
	1975	2 March	Amended to ply Sims Ave towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way road.
		16 November	Amended to Chai Chee Ter.
	1977	6 June	Extended to Ghim Moh Ter.
	1979	14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way road.
	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
	1987	12 April	Shortened to Eunos Ter.
	1989	5 November	Extended to Yio Chu Kang Ter.
		10 December	Amended to Eunos Int.
	1990	2 September	Amended to ply Bishan St 22 and Marymount Rd, skipping Ang Mo Kio Ave 1.
	1998	TBC	Extended to Marine Parade Ter with the route amendment of Service 15.
	2001	16 September	Amended to loop at Siglap Rd with the closure of Marine Parade Ter.
Template:SBS Transit (Current)		1 November	Operated by SBS Transit.
		9 December	Extended to Upp East Coast Ter.
	2009	3 December	Designated wheelchair-accessible bus service (WAB).

Service 13A

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Bedok Rd Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
	1973	1 November	Operated by Singapore Bus Service (SBS).
	1974	3 February	Shortened to loop at Mei Chin Rd and re-numbered Service 14 under 1974 Bus Rationalisation.

Service 14

Operator	Year	Date	Service changes
	1974	3 February	Re-numbered from Service 13A as a service between Bedok Rd Ter and Mei Chin Rd (loop) under 1974 Bus Rationalisation.
		24 February	Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way road, skipping Orchard Rd and Tanglin Rd.
		TBC	Amended to Upp Changi Rd 8¼ ms (13.3 km) Ter.
	1978	4 September	Amended to ply Nicoll Highway, skipping Kallang Rd.
	1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
		2 December	Extended to Jln Bt Merah Ter and amended to ply Napier Rd, Holland Rd and Queensway, skipping Tanglin Rd, Alexandra Rd, Stirling Rd, Mei Chin Rd and Mei Ling St.
		23 December	Amended to Bt Merah Central Ter.
	1980	15 June	Amended to Somapah Int.
		28 September	Amended to Bt Merah Int.
	1986	16 March	Amended to ply Stadium Walk.
		13 April	Amended to ply Stadium Rd, skipping Stadium Walk.
	1989	5 November	Extended to Changi Village Ter.
	1991	20 January	Shortened to Bedok Int under TransitLink Network Integration Exercise Phase 2.
	1992	29 March	Amended to ply Bt Merah Central.
	1993	23 May	Integrated with Service 92 and extended to Clementi Int under TransitLink Network Integration Exercise Phase 13, skipping National Stadium, Tanglin Rd/Orchard Blvd, Napier Rd, Holland Rd and Queensway.
	1994	29 May	Calls at 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	1998	TBC	Converted from partial air-con service to fully air-con service.
Template:SBS Transit (Current)	2001	1 November	Operated by SBS Transit.
	2002	7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
	2005	12 June	Calls at a new bus stop outside Science Park along AYE.
		2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
	2006	29 October	Amended to Clementi Temp Int.
	2008	14 July	Designated wheelchair-accessible bus service (WAB).
	2011	19 November	Amended to Bedok Temp Int.
		26 November	Amended to Clementi Integrated Transport Hub.
	2012	11 March	Calls at a new bus stop outside Blk 204 along Bedok North Int.
	2014	10 August	Calls at a new bus stop opposite Blk 2 along Mountbatten Rd.
		30 November	Amended to Bedok Integrated Transport Hub.

Service 15

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1975 - 1984)	1975	22 June	Introduced between Marine Terrace Ter and Prince Edward Rd Ter.
		1976	4 July	Extended to loop at Shenton Way.
		1981	TBC	Amended to Marine Parade Ter.
		1984	16 September	Integrated with Service 196 and withdrawn.
	2nd Gen (1995 - present)	1995	18 September	Re-introduced between Pasir Ris Int and Eunos Int with the opening of Temasek Polytechnic.
		1997	5 October	Integrated with Service M4 and extended to loop at Marine Parade Rd.
		1998	TBC	Amended to skip Marine Cres with the route extension of Service 13.
Template:SBS Transit		2001	1 November	Operated by SBS Transit.
		2009	3 December	Designated wheelchair-accessible bus service (WAB).
		2011	28 August	Amended to ply Jln Tenaga and Jln Damai with the partial closure of Kaki Bt Ave 1 to facilitate the construction of Kaki Bukit MRT station on the Downtown MRT Line.
		2013	10 March	Calls at an additional bus stop opposite Blk 571 along Pasir Ris Dr 1.
		2016	24 April	Amended to ply the reinstated Kaki Bt Ave 1, skipping Jln Tenaga and Jln Damai.
Template:Go-Ahead Singapore (Current)			18 September	Operated by Go-Ahead Singapore.

Service 16

Operator	Year	Date	Service changes
	1976	2 May	Introduced between Marine Terrace Ter and Telok Blangah Heights Ter.
	1981	15 February	Amended to Bt Merah Int.
		TBC	Amended to Marine Parade Ter.
	1983	TBC	Amended to ply Stadium Walk after 1930 hours daily.
	1986	13 April	Amended to ply Stadium Rd, skipping Stadium Walk during the evening diversion into Kallang Park/National Stadium.
	1987	23 February	Amended to Stadium Rd after 1845 hours daily.
	1993	23 May	Amended to ply Stadium Rd permanently under TransitLink Network Integration Exercise Phase 13.
		5 December	Integrated with Service 149, extended to loop at Changi Airport and amended to ply Zion Rd/Kim Seng Rd, Outram Rd and Tiong Bahru Rd under TransitLink Network Integration Exercise Phase 14, skipping River Valley Rd, Delta Rd and Lower Delta Rd.
	1994	29 May	Calls at 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	1996	TBC	Amended to terminate at Changi Airport.
	1998	6 September	Shortened to Marine Parade Ter with the conversion of Service 36 to a full day trunk service.
		TBC	Converted from partial air-con service to fully air-con service.
	2001	16 September	Amended to loop at Siglap Rd with the closure of Marine Parade Ter.
Template:SBS Transit (Current)		1 November	Operated by SBS Transit.
	2002	8 February	Amended to ply Stadium Walk and Stadium Cres with the partial closure of Stadium Blvd to facilitate the construction of Stadium MRT station on the Circle MRT Line.
		7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
	2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
	2006	18 February	Amended to ply Stadium Cres with the full closure of Stadium Blvd to facilitate the construction of Stadium MRT station on the Circle MRT Line.
		19 March	Amended to ply Guillemard Rd with the partial closure of Old Airport Rd and Dunman Rd to facilitate the construction of Dakota MRT station on the Circle MRT Line.
	2007	19 August	Extended to Bedok Int.
	2008	29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Guillemard Rd.
	2010	29 September	Amended to ply Mountbatten Rd with the closure of Stadium Rd/Stadium Dr to facilitate the construction of the Singapore Sports Hub.
	2011	19 November	Amended to Bedok Temp Int.
		3 December	Designated wheelchair-accessible bus service (WAB).
	2014	30 November	Amended to Bedok Integrated Transport Hub.
	2017	9 April	Amended to ply Still Rd South and East Coast Rd to facilitate the construction of the Thomson-East Coast MRT Line.
		12 November	Amended to ply the reinstated Marine Parade Rd and Joo Chiat Rd, skipping Still Rd South and East Coast Rd.

Service 16E

Operator	Year	Date	Service changes
	1994	31 January	Introduced between Bt Merah Int and Changi Airport as a peak hour uni-directional semi-express service on weekdays.
	1997	1 December	Re-numbered Service 36.

Service 17

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1981 - 1984)	1981	22 February	Introduced between Changi Point Ter and Prince Edward Rd Ter, operating on weekdays and Saturdays only.
			15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
		1984	8 April	Withdrawn.
	2nd Gen (1993 - present)	1993	4 April	Re-introduced between Pasir Ris Int and Bedok Int under TransitLink Network Integration Exercise Phase 12.
Template:SBS Transit		2001	1 November	Operated by SBS Transit.
		2002	TBC	Amended to loop at Bedok Int.
		2009	5 September	Calls at a new pair of bus stops outside Blk 231A CP and outside Blk 485 along Pasir Ris Dr 4.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
			19 November	Amended to loop at Bedok Temp Int.
		2014	30 November	Amended to loop at Bedok Integrated Transport Hub.
Template:Go-Ahead Singapore (Current)		2016	18 September	Operated by Go-Ahead Singapore and amended to terminate at Bedok Integrated Transport Hub.
		2017	21 October	Calls at a new pair of bus stops outside Tampines East Stn along Tampines Ave 2.

Service 17A

Operator	Year	Date	Service changes
Template:SBS Transit	2014	16 November	Converted from a short working trip to a full day service between Bedok North Depot and Bedok Temp Int (loop) under the LTA's Bus Service Enhancement Programme (BSEP). Wheelchair-accessible at launch.
		30 November	Amended to loop at Bedok Integrated Transport Hub.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operated by Go-Ahead Singapore, shortened to start from Bedok Integrated Transport Hub and terminate at Bedok North Ave 4.

Service 18

Operator	Year	Date	Service changes
	1984	25 August	Introduced between Bedok Int and Tampines Ave 2 (loop).
	1985	3 November	Amended to loop at Tampines St 22.
	1987	29 November	Extended to start from Tampines Int and loop at Bedok Int, skipping Tampines St 22.
	1998	TBC	Converted from partial air-con service to fully air-con service.
Template:SBS Transit (Current)	2001	1 November	Operated by SBS Transit.
	2004	13 December	Double decker operation withdrawn.
	2011	7 March	Designated wheelchair-accessible bus service (WAB).
		19 November	Amended to loop at Bedok Temp Int and amended to ply Bedok North Rd and Bedok North Ave 2, skipping Bedok North Ave 3 and Bedok North St 1.
	2012	11 March	Calls at a new bus stop outside Blk 204 along Bedok North Int.
	2014	30 November	Amended to loop at Bedok Integrated Transport Hub.
	2016	18 December	Amended to Tampines Concourse Int.
	2017	21 October	Amended to ply Tampines St 32, 33 and 34.

Service 19

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1979 - 1981)	1979	TBC	Introduced between Siglap Rd and Prince Edward Rd Ter.
		1980	12 May	Converted to peak-hour one-directional service on weekdays and Saturdays only.
		1981	11 August	Withdrawn.
	2nd Gen (1988 - 1990)	1988	19 June	Re-introduced between Bedok Int and Pasir Ris Dr 6 (loop).
		1989	10 December	Amended to Pasir Ris Int.
		1990	10 March	Integrated with Service 4 and withdrawn.
	3rd Gen (1993 - present)	1993	TBC	Re-introduced between Tampines Int and Changi Airport Cargo Complex (loop) as a day service with the permanent amendment of Service 29 to loop at Changi Village Ter.
Template:SBS Transit (Current)		2001	1 November	Operated by SBS Transit.
		2011	26 September	Designated wheelchair-accessible bus service (WAB).

Service 20

Operator	Service Gen	Year	Date	Service changes
Singapore Traction Company	1st Gen (1971 - 1989)	1971	11 April	Introduced between Fidelio St Ter and Commonwealth Ave Ter under 1971 Bus Reorganisation.
Associated Bus Service			6 December	Operated by Associated Bus Service (ABS).
		1973	1 July	Amended to Chai Chee Ter.
			1 November	Operated by Singapore Bus Service (SBS).
		1974	8 December	Amended to skip Market St.
		1975	2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way road.
		1977	7 March	Extended to Ghim Moh Ter.
		1978	15 January	Amended to ply Jln Sultan, skipping Sumbawa Rd.
		1979	14 October	Amended to ply Sims Ave East towards Chai Chee Ter with the conversion of Changi Rd to one-way road.
		1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
		1989	5 November	Withdrawn.
	2nd Gen (1994 - 2000)	1994	TBC	Re-introduced between Sims Pl Ter and St. Wilfred Rd (loop).
		2000	27 November	Integrated with Service 125 and withdrawn.
Template:SBS Transit (Present)	3rd Gen (2013 – present)	2013	9 June	Re-introduced between Tampines Int and Changi Business Park Central 2 (loop) under the LTA's Bus Service Enhancement Programme (BSEP).
			30 September	Designated wheelchair-accessible bus service (WAB).
		2015	20 December	Calls at a new pair of bus stops outside and opposite Changi City Point along Changi South Ave 2.
		2017	21 October	Amended to ply Somapah Rd and Changi South Ave 1, skipping express sectors along Upp Changi Rd East and Xilin Ave.