History of Services 1 - 10

Service 1

Operator	Year	Date	Service changes
Associated Bus Service	1971	11 April	Introduced between Changi Point Ter and Delta Circus Ter under 1971 Bus Reorganisation.
	1973	11 March	Amended to ply Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	1974	1 December	Amended to ply New Upp Changi Rd, Bedok Plain, Bedok Heights, Upp East Coast Rd and Bedok Rd.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1975	2 February	Amended to ply Tiong Bahru Rd and the extended Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
		2 March	Amended to ply Sims Ave towards Changi Point Ter with the conversion of Geylang Rd to one-way traffic.
		25 May	Amended to ply Bedok Walk and New Upp Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
		TBC	Amended to new Changi Point Ter.
		14 November	Amended to ply New Upp Changi Rd, skipping Bedok Plain and Bedok Walk.
	1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
	1979	14 October	Amended to ply Sims Ave East towards Changi Point Ter with the conversion of Changi Rd to one-way traffic.
		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 traffic.
	1981	TBC	Revised to operate on weekdays and Saturdays only.
		15 June	Amended to ply Loyang Ave and Loyang Way with the partial closure of Upp Changi Rd.
		11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	1987	6 April	Skips abolished bus stop before College Rd along Outram Rd.
	1989	5 November	Withdrawn.

Service 1A

Operator	Year	Date	Service changes
Associated Bus Service	1971	1 August	Introduced between Changi Point Ter and Delta Circus Ter.
	1973	11 March	Amended to ply Zion Rd towards Delta Circus Ter with the partial conversion of Kim Seng Rd to one-way traffic.
	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.
	1974	1 December	Amended to ply New Upp 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 traffic.
		25 May	Amended to ply Bedok Walk and New Upp Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
		TBC	Amended to new 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 traffic.
	1980	28 December	Amended to ply Jln Bt Merah and Kg Bahru Rd, skipping Outram Rd, Tiong Bahru Rd and 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.
		13 December	Serves new staggered bus stop opposite Peninsula Plaza along North Bridge Rd, skipping the bus stop outside St Andrew's Cathedral.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along South Bridge Rd, skipping the bus stop opposite Jamae Mosque.
			Serves additional bus stop opposite Upp Hokien St along South Bridge Rd.
	1990	22 July	Serves additional bus stop outside Ellenborough Market along Eu Tong Sen St.
	1992	29 November	Shortened to New Bridge Rd Ter under TransitLink Network Integration Exercise Phase 10.
	1993	11 April	Amended to ply Jln Sultan, Victoria St, Hill St and New Bridge Rd, skipping South Bridge Rd and Neil Rd.
	1994	3 July	Amended to ply Kallang Rd and Victoria St, skipping Crawford St, North Bridge Rd and Jln Sultan.
	1996	TBC	Serves additional bus stop outside Kallang Stn along Sims Ave.
	1997	7 December	Amended to ply Upp Pickering St, South Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
	1999	TBC	Serves bus stop outside Bugis Stn along Victoria St, skipping the bus stop opposite Bugis Junction.
Template:SBS Transit	2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, South Bridge Rd and Kreta Ayer Rd.
		TBC	Serves new pair of bus stops outside and opposite Changi Chapel Museum along Upp Changi Rd North.
	2004	TBC	Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
	2005	TBC	Serves new bus stop outside ITE Reg Campus along Upp Changi 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	Operations transferred to Go-Ahead Singapore.
	2018	10 March	Extended to Kg Bahru Ter with the closure of New Bridge Rd Ter.
		8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.

Service 2A

Operator	Year	Date	Service changes
Associated Bus Service	1971	1 August	Introduced between Changi Point Ter and Commonwealth Ave Ter.
	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 Delta Circus Ter.
			1 December	Amended to ply New Upp 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 Delta Circus Ter with the partial conversion of Kim Seng Rd and Outram Rd to one-way traffic.
			2 March	Amended to ply Sims Ave towards Changi Point Ter with the conversion of Geylang Rd to one-way traffic.
			25 May	Amended to ply Bedok Walk and New Upp Changi Rd, skipping Bedok Heights and Upp East Coast Rd.
			TBC	Amended to new 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, 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 traffic.
		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.
		1989	19 February	Serves new bus stop outside Blk 135 along Jurong East St 13.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Market along Eu Tong Sen St.
		1991	6 January	Withdrawn under TransitLink Network Integration Exercise Phase 1.
Template:SBS Transit	2nd Gen (Since 2002)	2002	7 April	Re-introduced between Tampines Int and Pasir Ris St 71 (Loop) with the integration of Services 294 and 357.
		2003	TBC	Serves new bus stop outside Blk 741 along Pasir Ris Dr 10.
			19 October	Extended to loop at Punggol Central.
			30 November	Amended to Punggol Temp Int.
		2009	5 September	Serves 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	Serves new bus stop outside Blk 612 along Pasir Ris Dr 1.
		2014	24 August	Serves 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	Operations transferred to Go-Ahead Singapore.
		2017	21 October	Serves 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.
		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 traffic.
		1980	TBC	Extended to loop at Moulmein Rd.
		1988	31 July	Extended to St. Michael's Ter.
		1989	19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		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 (Since 2013)	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 Upp Changi Rd 8¼ m.s. 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 traffic, skipping New Bridge Rd.
		1973	TBC	Extended to Bt Timah Ter.
		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 traffic.
		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 traffic.
		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.
			13 December	Serves new staggered bus stop opposite Peninsula Plaza along North Bridge Rd, skipping the bus stop outside St Andrew's Cathedral.
		1989	25 June	Skips the bus stop after Tan Boon Chong Ave along Holland Rd.
			19 November	Serves new bus stop outside Kallang Stn along Sims Ave.
		1990	22 July	Serves additional bus stop outside Ellenborough Market along Eu Tong Sen St.
		1992	29 March	Amended to ply Holland Ave, Commonwealth 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, Commonwealth 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.
		1995	17 September	Operations transferred to Trans-Island Bus Service (TIBS).
		1997	TBC	Skips the bus stop outside Kallang Stn along Sims Ave.
			7 December	Amended to ply Upp Pickering St, 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 (Since 2007)	2007	11 March	Re-introduced between Pasir Ris Int and Bt Merah Int.
		2008	TBC	Serves new pair of bus stops before and after Pasir Ris Dr 3 along New Loyang Link.
		2011	27 June	Designated wheelchair-accessible bus service (WAB).
			28 August	Amended to ply Jln Tenaga, Bedok Reservoir Rd 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, Bedok Reservoir Rd 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 traffic.
		1983	27 November	Integrated with Service 3 and withdrawn.
	2nd Gen (Since 1993)	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		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	Operations transferred to 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 Blue Arrow 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	19 February	Serves new bus stop outside Blk 135 along Jurong East St 13.
		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 towards Bedok Int 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.
	1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
Template:SBS Transit (Current)	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 traffic.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		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 Marina Ctr Ter.
		1989	6 November	Withdrawn.
	2nd Gen (Since 1990)	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 Kim Keat Link and Lor 6 Toa Payoh towards Toa Payoh Int.
		1995	18 September	Amended to ply Tampines Ave 1, Tampines Ave 10 and Bedok North Rd with the opening of Temasek Polytechnic.
		1998	31 May	Amended to temporary site of Toa Payoh Int.
		1999	TBC	Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
		2000	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
Template:SBS Transit (Current)		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		2011	4 September	Amended to skip Bendemeer Rd, Whampoa North and Serangoon Rd towards Toa Payoh Integrated Transport Hub with the permanent closure of Whampoa North.
		2017	12 February	Serves 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	Serves 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 traffic.
	1981	TBC	Extended 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.
	1987	20 September	Skips 2 pairs of abolished bus stops along Upp Changi Rd East with the opening of TPE.
	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.
	1993	13 September	Skips the bus stop outside Bedok Stn along New Upp Changi Rd towards Bedok Int.
	1995	15 January	Amended to ply Bedok Rd, Upp Changi Rd, Simei Ave and Simei St 3, skipping Upp Changi Rd East.
Template:SBS Transit (Current)	2003	TBC	Serves new pair of bus stops outside and opposite Loyang Ind Est along Loyang Ave.
	2004	TBC	Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
	2008	TBC	Serves new bus stop outside Changi Beach CP 2 along Nicoll Dr, skipping the bus stop opposite Changi Beach CP 2.
	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	Serves 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 Ter under 1971 Bus Reorganisation.
		16 June	Extended to Shipyard Rd Ter.
	1974	TBC	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter.
		8 December	Amended to ply the extended Robinson Rd, skipping Market St.
	1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
	1978	1 June	Amended to Jurong Int.
	1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
	1980	15 June	Amended to Somapah Int.
	1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
	1984	27 April	Extended to Tampines Ave 5 Ter.
	1986	7 December	Serves new bus stop before Bedok South Ave 3 along Upp East Coast Rd.
	1987	29 November	Amended to Tampines Int.
	1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina House.
		23 October	Skips a pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	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 under TransitLink Network Integration Exercise Phase 8.
	1994	29 May	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	1997	TBC	Serves an additional pair of bus stops outside and opposite Tampines Stadium along Tampines Ave 5.
	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.
Template:SBS Transit (Current)	2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
		TBC	Serves new bus stop before Changi Fire Stn along Upp Changi Rd.
		6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
	2005	2 July	Serves 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 Cassia Link, Cassia Cres, Guillemard Rd and Guillemard Camp 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	Serves new bus stop outside VivoCity along Telok Blangah Rd.
	2008	7 December	Skips abolished bus stop opposite Temenggong D Mosque along Telok Blangah Rd.
		29 December	Amended to ply the reinstated Old Airport Rd and Dunman Rd, skipping Cassia Link, Guillemard Rd and Guillemard Camp 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 Ter under 1971 Bus Reorganisation.
		1974	3 February	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
		1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
		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.
		1986	7 December	Serves new bus stop before Bedok South Ave 3 along Upp East Coast Rd.
		1987	6 June	Amended to 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 (Since 1990)	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)		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	Serves 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.
	1974	3 February	Amended to Upp Changi Rd 8¼ ms (13.3km) Ter under 1974 Bus Rationalisation.
	1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
		11 December	Amended to ply New Upp Changi Rd, Bedok Walk, Bedok Plain and Bedok Highway.
	1979	TBC	Relocated to Upp Changi Rd 15.5km Ter.
	1980	15 June	Amended to Somapah Int.
		28 December	Amended to ply Upp Changi Rd East, skipping Bedok Rd and Upp Changi Rd.
	1982	TBC	Amended to Buona Vista Ter.
	1987	27 September	Amended to ply North Canal Rd and Eu Tong Sen St, skipping Upp Circular Rd.
		13 December	Serves new staggered bus stop opposite Peninsula Plaza along North Bridge Rd, skipping the bus stop outside St Andrew's Cathedral.
	1988	23 October	Extended to Pasir Ris Ter and amended to New Bridge Rd Ter.
	1989	10 December	Amended to Pasir Ris Int.
	1990	22 July	Serves additional bus stop outside Ellenborough Market along Eu Tong Sen St.
	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 Upp Pickering St, South Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown MRT station on the North East MRT Line.
	1999	TBC	Serves new pair of bus stops outside and opposite Lion Home for Elders along Bedok South Rd.
Template:SBS Transit	2002	20 April	Amended to ply the reinstated New Bridge Rd, skipping Upp Pickering St, South Bridge Rd and Kreta Ayer 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	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
Template:Go-Ahead Singapore (Current)	2016	18 September	Operations transferred to Go-Ahead Singapore.
	2017	21 October	Serves new pair of bus stops outside Tampines East Stn along Tampines Ave 2.
	2018	10 March	Extended to Kg Bahru Ter with the closure of New Bridge Rd Ter.
		8 April	Serves new pair of bus stops after Somapah Rd and before Simei Rd along Upp Changi Rd East.

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.
	1974	3 February	Amended to Upp Changi Rd 8¼ ms (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 traffic, 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 traffic.
		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 traffic.
	1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
	1987	12 April	Shortened to Eunos Ter.
	1989	5 November	Amended 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.
	1996	TBC	Serves additional bus stop outside Kallang Stn along Sims Ave.
	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)		9 December	Extended to Upp East Coast Ter.
	2003	20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
	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.
	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 traffic, skipping Orchard Rd and Tanglin Rd.
		TBC	Amended to Upp Changi Rd 8¼ ms (13.3 km) Ter.
	1975	2 March	Amended to ply Sims Ave and Lor 1 Geylang towards Upp Changi Rd 13.3 km Ter with the conversion of Geylang Rd to one-way traffic.
	1978	4 September	Amended to ply Nicoll Highway, skipping Sims Ave/Geylang Rd, Kallang Rd/Crawford St and Victoria St/North Bridge 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.
		7 December	Serves new bus stop before Bedok South Ave 3 along Upp East Coast Rd.
	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.
		TBC	Amended to ply Orchard Link, skipping Grange Rd.
	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	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
Template:SBS Transit (Current)	2002	TBC	Serves new staggered bus stop outside Mutiara Crest along River Valley Rd, skipping the bus stop outside Mutiara View.
		7 July	Skips the bus stop opposite Mandarin Singapore along Orchard Rd.
	2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
		6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
	2005	12 June	Serves 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.
	2007	TBC	Serves new pair of bus stops outside and opposite Blk 180 along Bedok North Rd.
	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	Serves new bus stop outside Blk 204 along Bedok North Int.
	2014	10 August	Serves new bus stop opposite Blk 2 along Mountbatten Rd.
		30 November	Amended to Bedok Integrated Transport Hub.
	2018	9 September	Amended to ply North Buona Vista Rd and Commonwealth Ave West, skipping Dover Rd and Dover Ave.

Service 15

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1975 - 1984)	1975	22 June	Introduced between Marine Terrace Ter and Prince Edward Ter.
		1976	15 February	Serves new staggered bus stop outside Overseas Union Finance along Robinson Rd.
			14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
			4 July	Extended to loop at Shenton Way.
		1981	5 July	Amended to Marine Parade Ter.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1984	16 September	Integrated with Service 196 and withdrawn.
	2nd Gen (Since 1995)	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.
			TBC	Serves new pair of bus stops outside East Coast Apts and before St. Patrick's Rd along Telok Kurau Rd.
		2000	TBC	Serves new pair of bus stops outside and opposite Tropica Condo along Tampines Ave 1.
Template:SBS Transit		2009	3 December	Designated wheelchair-accessible bus service (WAB).
		2011	28 August	Amended to ply Jln Tenaga, Bedok Reservoir Rd 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	Serves 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, Bedok Reservoir Rd and Jln Damai.
Template:Go-Ahead Singapore (Current)			18 September	Operations transferred to 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.
		5 July	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.
	1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
	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	Serves 2 new pairs of bus stops outside The Concourse, outside Golden Mile Twr and outside and opposite Suntec City along Nicoll Highway.
	1996	TBC	Converted to bi-directional service between Bt Merah Int and Changi Airport PTB 1.
	1998	6 September	Shortened to Marine Parade Ter with the conversion of Service 36 to a full day trunk service.
	2001	16 September	Amended to loop at Siglap Rd from Bt Merah Int with the closure of Marine Parade Ter.
Template:SBS Transit (Current)	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.
	2004	20 April	Amended to ply Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd to facilitate reinstatement works for the collapsed Nicoll Highway.
		6 December	Amended to ply the reinstated Nicoll Highway, skipping Mountbatten Rd, Geylang Rd, Kallang Rd, Victoria St, Jln Sultan and Beach Rd.
	2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
		30 October	Serves new bus stop outside Blk 94 along Zion 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 Cassia Link, Cassia Cres, Guillemard Rd and Guillemard Camp 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 Cassia Link, Guillemard Rd and Guillemard Camp 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 Marine Parade MRT station on 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 (Since 1993)	1993	4 April	Re-introduced between Pasir Ris Int and Bedok Int under TransitLink Network Integration Exercise Phase 12.
Template:SBS Transit		2002	TBC	Converted to loop service between Pasir Ris Int and Bedok Int.
		2009	5 September	Serves 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	Operations transferred Go-Ahead Singapore and reverted to bi-directional service.
		2017	21 October	Serves 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	Operations transferred to 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.
	1999	TBC	Serves new pair of bus stops outside and opposite The Clearwater Condo along Bedok Reservoir Rd.
		TBC	Serves new pair of bus stops opposite Blk 761 and opposite Baywater along Bedok North Ave 3.
Template:SBS Transit (Current)	2006	TBC	Skips a pair of abolished bus stops outside and opposite Bedok Green Sec Sch along Bedok North Ave 3.
	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.
	2012	11 March	Serves new bus stop outside Blk 204 along Bedok North Int.
	2014	30 November	Amended to loop at Bedok Integrated Transport Hub.
	2016	18 December	Extended to Tampines Concourse Int.
	2017	21 October	Amended to ply Tampines St 32, St 33 and St 34.

Service 19

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1979 - 1981)	1979	TBC	Introduced between Siglap Rd and Prince Edward 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 (Since 1993)	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)		2003	TBC	Serves new pair of bus stops outside and opposite Loyang Ind Est along Loyang Ave.
		2008	TBC	Serves new bus stop outside Changi Beach CP 2 along Nicoll Dr, skipping the bus stop opposite Changi Beach CP 2.
		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	Operations transferred to Associated Bus Service (ABS).
		1973	1 July	Amended to Chai Chee Ter.
		1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	2 March	Amended to ply Sims Ave towards Chai Chee Ter with the conversion of Geylang Rd to one-way traffic.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
		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 traffic.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1985	8 September	Extended to Bedok Int with the closure of Chai Chee Ter.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina House.
		1989	5 November	Integrated with Service 100 and 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 (Since 2013)	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	Serves 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 Upp Changi Rd East and Xilin Ave.
		2018	10 June	Serves new pair of bus stops outside and opposite The Eightrium along Changi South Ave 1.