History of Services 91 - 100

Service 91

Operator	Service Gen	Year	Date	Service changes
Singapore Traction Company	1st Gen (1971 - 1989)	1971	11 April	Introduced between Jln Ang Teng Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
United Bus Company			6 December	Operated by United Bus Company (UBC).
		1974	3 February	Amended to ply Paya Lebar Rd, Tg Katong Rd, Dunman Rd, Old Airport Rd and Mountbatten Rd under 1974 Bus Rationalisation, skipping MacPherson Rd and Aljunied Rd.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
			14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
			30 December	Amended to ply Sims Ave/Geylang Rd and the extended Tg Katong Rd, skipping Guillemard Rd.
		1978	15 January	Amended to ply Jln Sultan, skipping Sumbawa Rd.
		1981	30 June	Amended to loop at Airport Rd with the closure of Jln Ang Teng Ter.
			5 July	Shortened to Geylang Fringe Car Park.
		1989	5 November	Withdrawn.
	2nd Gen (Since 1995)	1995	13 February	Re-introduced between Buona Vista Ter and Ayer Rajah Cres (Loop), operating on weekdays and Saturdays only.
Template:SBS Transit (Current)		2006	TBC	Serves merged bus stop opposite Buona Vista Stn along North Buona Vista Rd with the closure of the staggered bus stop.
		2012	9 April	Skips abolished bus stop outside Basement Food Court along Ayer Rajah Cres.
		2014	3 December	Designated wheelchair-accessible bus service (WAB).

Service 91A

Operator	Year	Date	Service changes
Template:SBS Transit	2000	TBC	Introduced as a short-trip service from Buona Vista Ter to Ayer Rajah Cres (Ayer Rajah Bus Pk) during morning peak hours on weekdays.
	2006	TBC	Serves merged bus stop opposite Buona Vista Stn along North Buona Vista Rd with the closure of the staggered bus stop.
	2012	TBC	Withdrawn.

Service 92

Operator	Service Gen	Year	Date	Service changes
United Bus Company	1st Gen (1971 - 1993)	1971	11 April	Introduced between Jln Ang Teng Ter and Gagak Selari Barat Ter under 1971 Bus Reorganisation.
		1972	18 June	Amended to ply Bendemeer Rd towards Gagak Selari Barat Ter with the conversion of Serangoon Rd to one-way traffic.
		1973	11 March	Amended to ply Hoot Kiam Rd towards Jln Ang Teng Ter with the conversion of Irwell Bank Rd to one-way road.
		1974	3 February	Extended to Alexandra Rd (Alexandra Hosp) 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.
			1 October	Serves new bus stop outside Nan Hwa Girls' High Sch along Bencoolen St.
				Serves merged bus stop outside Sri Srinivasa Perumal Tp along Serangoon Rd.
		1981	30 June	Amended to loop at Airport Rd with the closure of Jln Ang Teng Ter.
		1985	28 April	Integrated with Service 185 and extended to Clementi Int.
		1988	11 January	Serves merged bus stop along Ayer Rajah Rd.
			8 March	Amended to ply Clementi Ave 3 with the abolition of right turning from Clementi Ave 3 to Commonwealth Ave West.
		1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
		1993	23 May	Withdrawn and integrated with Service 14 under TransitLink Network Integration Exercise Phase 13.
	2nd Gen (Since 1997)	1997	6 October	Re-numbered from Service M1 as a service between Science Park Dr and Mount Sinai Dr (Loop).
Template:SBS Transit (Current)		2005	TBC	Serves new bus stop between House Nos. 33 and 35 along Mount Sinai Dr.
		2007	26 November	Amended to start from Ghim Moh Ter and loop at Science Park Dr/Mount Sinai Dr.
		2014	28 September	Serves 3 new bus stops outside Blk 85 and outside and opposite The Rutherford along Science Park Dr.
			29 September	Designated wheelchair-accessible bus service (WAB).

Service 92A

Operator	Year	Date	Service changes
	2000	TBC	Introduced as a short-trip service from Science Park Dr (Blk 85) to Ghim Moh Rd (Blk 13) during evening peak hours on weekdays.
Template:SBS Transit (Current)	2012	TBC	Extended to start from Ghim Moh Ter.
	2014	29 September	Designated wheelchair-accessible bus service (WAB).

Service 92B

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2007	26 November	Introduced as a short-trip service from Ghim Moh Ter to Science Park Dr (Blk 85) during peak hours and after the last bus of Service 92 on weekdays and Saturdays.
	2014	28 September	Serves 3 new bus stops outside Blk 85 and outside and opposite The Rutherford along Science Park Dr.
		29 September	Designated wheelchair-accessible bus service (WAB).
	2017	26 December	Shortened to terminate at Science Park Dr (The Rutherford).

Service 92M

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2015	30 August	Introduced between Ghim Moh Ter and North Buona Vista Rd (Loop), operating on Sundays and Public Holidays only.

Service 93

Operator	Year	Date	Service changes
United Bus Company	1971	11 April	Introduced between Jln Ang Teng Ter and Alexandra Rd Ter under 1971 Bus Reorganisation.
	1981	30 June	Amended to loop at Airport Rd with the closure of Jln Ang Teng Ter.
	1985	13 January	Extended to World Trade Ctr Ter.
	1987	12 August	Skips abolished bus stop after Joan Rd along Lornie Rd.
	1993	23 May	Extended to Eunos Int under TransitLink Network Integration Exercise Phase 13.
	1999	TBC	Skips abolished pair of bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
Template:SBS Transit (Current)	2004	TBC	Skips abolished bus stop outside Nanyang Pr Sch along Farrer Rd.
	2007	TBC	Skips abolished bus stop before Paya Lebar Rd along Airport Rd to facilitate the construction of KPE.
	2009	8 March	Skips a pair of bus stops outside and opposite Bartley Sec Sch with the realignment of the junction of Upp Paya Lebar Rd and Bartley Rd.
	2012	3 December	Designated wheelchair-accessible bus service (WAB).
	2018	28 October	Amended to ply southbound Lornie Highway towards HarbourFront Int.
	2019	23 June	Amended to ply northbound Lornie Highway towards Eunos Int.

Service 93A

Operator	Year	Date	Service changes
United Bus Company	1971	25 April	Introduced between Jln Ang Teng Ter and Jln Bt Merah Ter.
	1974	3 February	Withdrawn under 1974 Bus Rationalisation.

Service 94

Operator	Service Gen	Year	Date	Service changes
Singapore Traction Company	1st Gen (1971 - 1989)	1971	11 April	Introduced between Jln Kolam Ayer Ter and Ulu Pandan Ter under 1971 Bus Reorganisation.
			9 May	Amended to ply Tiong Bahru Rd and Tanglin Rd.
Associated Bus Service			6 December	Operated by Associated Bus Service (ABS).
		1972	18 June	Amended to ply Bendemeer Rd towards Ulu Pandan Ter with the conversion of Serangoon Rd to one-way traffic.
		1974	8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1976	15 February	Serves staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
			TBC	Amended to ply Kallang Bahru, skipping Serangoon Rd/Bendemeer Rd.
			13 December	Extended to Sims Pl Ter.
		1977	17 October	Shortened to loop at Shenton Way.
		1979	11 February	Amended to ply the extended Shenton Way, Keppel Rd and Anson Rd, skipping Parsi Rd.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1982	TBC	Amended to ply Aljunied Rd, MacPherson Rd, Bendemeer Rd and Geylang Bahru, skipping Jln Kolam Ayer.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina House.
		1989	11 June	Withdrawn.
	2nd Gen (Since 1989)		5 November	Re-introduced between Eunos Ter and Airport Rd (Loop).
			10 December	Amended to Eunos Int.
		1993	23 May	Converted to a day service on weekdays and Saturdays under TransitLink Network Integration Exercise Phase 13.
Template:SBS Transit (Current)		2008	TBC	Serves new bus stop after Defu Lane 12 along Airport Rd.
			24 September	Skips abolished bus stop outside KB Warehouse Complex along Airport Rd.
		2010	28 June	Designated wheelchair-accessible bus service (WAB).

Service 94A

Operator	Year	Date	Service changes
	2000	TBC	Introduced as a short-trip service from Eunos Int to Airport Rd (RSAF Paya Lebar) during morning peak hours on weekdays and Saturdays.
Template:SBS Transit (Current)	2008	TBC	Serves new bus stop after Defu Lane 12 along Airport Rd.
	2010	28 June	Designated wheelchair-accessible bus service (WAB).

Service 95

Operator	Service Gen	Year	Date	Service changes
United Bus Company	1st Gen (1971 - 1988)	1971	22 April	Introduced between Jln Ang Teng Ter and Havelock Rd (Loop).
		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	11 March	Amended to ply Hoot Kiam Rd towards Jln Ang Teng Ter with the conversion of Irwell Bank Rd to one-way traffic.
		1974	3 February	Amended to Lor 4 Toa Payoh, Toa Payoh Central and Lor 2 Toa Payoh and extended to Ulu Pandan Ter under 1974 Bus Rationalisation.
		1981	15 June	Extended to Clementi Int.
			30 June	Amended to loop at Airport Rd with the closure of Jln Ang Teng Ter.
		1986	16 November	Serves new staggered bus stop outside Thong Teck Bldg along Scotts Rd, skipping the bus stop outside Metro Orchard.
		1988	8 March	Amended to ply Clementi Ave 3 with the abolition of right turning from Clementi Ave 3 to Commonwealth Ave West.
			13 March	Withdrawn with the introduction of Service 105.
	2nd Gen (Since 1990)	1990	15 January	Re-introduced between Buona Vista Ter and Lower Kent Ridge Rd (Loop), operating on weekdays and Saturdays only.
		1993	23 May	Amended to ply Holland Dr, Holland Ave and C'wealth Ave towards Lower Kent Ridge Rd.
		1996	TBC	Extended to operate on Sundays and Public Holidays.
		2001	23 July	Extended to loop at Kent Ridge Ter.
Template:SBS Transit (Current)		2006	17 December	Amended to start from Kent Ridge Ter and loop at Holland Dr.
		2010	18 October	Designated wheelchair-accessible bus service (WAB).
		2011	29 May	Serves new pair of bus stops outside Kent Ridge Stn along Lower Kent Ridge Rd.
		2013	13 October	Serves relocated bus stop opposite Blk 21 along Holland Dr with the abolition of the bus stop outside Blk 17 along North Buona Vista Rd.

Service 95A

Operator	Year	Date	Service changes
Template:SBS Transit	2000	TBC	Introduced as a short-trip service from Buona Vista Ter to Lower Kent Ridge Rd (NUH) during morning peak hours on weekdays.
	2006	17 December	Shortened to start from North Buona Vista Rd (Opp Buona Vista Stn).
	2010	18 October	Designated wheelchair-accessible bus service (WAB).
	2011	29 May	Serves new bus stop outside Kent Ridge Stn along Lower Kent Ridge Rd.
		8 October	Withdrawn with the opening of Circle MRT Line Stage 4.

Service 95B

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2005	TBC	Introduced as a short-trip service from Kent Ridge Ter to North Buona Vista Rd (Buona Vista Stn) during evening peak hours on weekdays.
	2010	18 October	Designated wheelchair-accessible bus service (WAB).
	2011	29 May	Serves new bus stop outside Kent Ridge Stn along Lower Kent Ridge Rd.

Service 95C

Operator	Year	Date	Service changes
Template:SBS Transit	2005	26 September	Introduced as a short-trip service from North Buona Vista Rd (Opp Buona Vista Stn) to Lower Kent Ridge Rd (Kent Ridge Hall) during morning peak hours on weekdays.
	2010	18 October	Designated wheelchair-accessible bus service (WAB).
	2011	29 May	Serves new bus stop outside Kent Ridge Stn along Lower Kent Ridge Rd.
		8 October	Withdrawn with the opening of Circle MRT Line Stage 4.

Service 95D

Operator	Year	Date	Service changes
Template:SBS Transit	2007	TBC	Introduced as a short-trip service from Kent Ridge Ter to Holland Rd (Holland Village) during peak hours and after the last bus of Service 95 on weekdays.
	2010	18 October	Designated wheelchair-accessible bus service (WAB).
	2011	29 May	Serves new bus stop outside Kent Ridge Stn along Lower Kent Ridge Rd.
		8 October	Withdrawn with the opening of Circle MRT Line Stage 4.

Service 96

Operator	Year	Date	Service changes
	1982	16 August	Introduced between Clementi Int and Kent Ridge Cres (Loop), operating on weekdays and Saturdays only.
	1986	1 June	Skips abolished bus stop before Ayer Rajah Rd along Clementi Rd.
	1988	8 March	Amended to ply Clementi Ave 3 with the abolition of right turning from Clementi Ave 3 to Commonwealth Ave West.
	1990	2 July	Extended to operate on Sundays and Public Holidays.
Template:SBS Transit	2006	29 October	Amended to Clementi Temp Int.
	2011	26 November	Amended to Clementi Integrated Transport Hub.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)	2016	26 June	Operations transferred to Tower Transit Singapore.

Service 96A

Operator	Year	Date	Service changes
	2000	TBC	Introduced as a short-trip service from Clementi Int to Kent Ridge Cres (NUS Raffles Hall) during morning peak hours on weekdays.
Template:SBS Transit	2006	29 October	Amended to Clementi Temp Int.
	2011	26 November	Amended to Clementi Integrated Transport Hub.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)	2016	26 June	Operations transferred to Tower Transit Singapore.

Service 96B

Operator	Year	Date	Service changes
Template:SBS Transit	2007	TBC	Introduced as a short-trip service from Clementi Temp Int to Commonwealth Ave West (Clementi Stn) during evening peak hours on weekdays.
	2011	26 November	Amended to Clementi Integrated Transport Hub.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)	2016	26 June	Operations transferred to Tower Transit Singapore.

Service 97

Operator	Year	Date	Service changes
	1983	29 August	Introduced between Jurong East Ter and Connaught Dr (Loop) as a peak hour service on weekdays and Saturdays.
		18 December	Integrated with Service 86, extended to Hougang Int and converted to full day service.
	1985	30 June	Amended to Jurong East Int.
	1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina House.
		18 December	Integrated with Service 79 and amended to ply AYE and Alexandra Rd, skipping Clementi Rd and Pasir Panjang Rd.
	1994	17 December	Extended to Hougang Central Int.
	1998	24 May	Amended to temporary site of Hougang Central Int.
	1999	TBC	Skips abolished pair of bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
	2001	20 May	Amended back to original site of Hougang Central Int.
Template:SBS Transit	2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
	2003	20 June	Serves new pair of bus stops outside Potong Pasir Stn along Upp Serangoon Rd.
		27 July	Shortened to loop at Temasek Ave and amended to ply Esplanade Dr under North East MRT Line Rationalisation Phase 2, skipping Connaught Dr.
	2005	12 June	Serves new bus stop outside Science Park along AYE.
	2006	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.
	2010	26 April	Amended to Marina Ctr Ter, skipping Collyer Quay/Fullerton Rd and Esplanade Dr.
	2011	17 December	Amended to Jurong East Temp Int.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
	2013	1 December	Serves new bus stop outside Downtown Stn along Central Blvd.
Template:Tower Transit Singapore (Current)	2016	12 June	Operations transferred to Tower Transit Singapore.

Service 97A

Operator	Year	Date	Service changes
	2000	TBC	Introduced as a short-trip service from Jurong East Int to Fullerton Rd (Fullerton Sq) during morning peak hours on weekdays.
Template:SBS Transit	2003	27 July	Extended to terminate at Raffles Ave (Opp Marina Sq) and operate after the last bus of Service 97 under North East MRT Line Rationalisation Phase 2.
	2010	26 April	Withdrawn with the route amendment of Service 97 to Marina Ctr Ter.

Service 97B

Operator	Year	Date	Service changes
Template:SBS Transit	2006	11 September	Introduced as a short-trip service from Jurong East Int to Telok Blangah Rd (HarbourFront Stn) during morning peak hours on weekdays.
	2010	TBC	Withdrawn.

Service 98

Operator	Year	Date	Service changes
	1984	1 January	Introduced between Jurong Int and Jurong East Central (Loop).
	1985	30 June	Amended to start from Jurong East Int and loop at Jurong Int.
	1990	1 July	Amended to loop at Jln Ahmad Ibrahim and amended to ply Jurong West St 51 and Boon Lay Way.
	1991	20 January	Integrated with Service 247 and extended to loop at Jurong Pier Rd under TransitLink Network Integration Exercise Phase 2.
Template:SBS Transit	2003	TBC	Amended to loop at Jurong Pier Way.
	2004	TBC	Skips abolished pair of bus stops outside Jurong Power Stn and outside JPL Ind Pte Ltd along Jurong Pier Rd.
	2011	17 December	Amended to Jurong East Temp Int.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)	2016	26 June	Operations transferred to Tower Transit Singapore.

Service 98A

Operator	Service Gen	Year	Date	Service changes
	1st Gen (2000 - 2008)	2000	TBC	Introduced as a short-trip service between Jurong East Int and Corporation Rd (Loop) during off peak hours daily.
Template:SBS Transit		2007	5 September	Serves 2 additional bus stops after Corporation Pl along Jln Ahmad Ibrahim and opposite NTUC Lifestyle Ctr along Yung Ho Rd.
		2008	28 January	Re-numbered Service 98M.
	2nd Gen (Since 2011)	2011	3 May	Re-introduced as a short-trip service from Boon Lay Way (Lakeside Stn) to Corporation Rd (Corporation Pl) during evening peak hours on weekdays.
		2012	25 June	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)		2016	26 June	Operations transferred to Tower Transit Singapore.

Service 98B

Operator	Year	Date	Service changes
Template:SBS Transit	2012	16 April	Introduced as a short-trip service from Boon Lay Way (Lakeside Stn) to Jurong Pier Way (Jurong Island Checkpt) during morning peak hours on weekdays.
		25 June	Designated wheelchair-accessible bus service (WAB).
	2013	TBC	Extended to start from Jurong West Ave 1 (Blk 490).
Template:Tower Transit Singapore (Current)	2016	26 June	Operations transferred to Tower Transit Singapore.

Service 98M

Operator	Year	Date	Service changes
Template:SBS Transit	2008	28 January	Converted from Short Working Trip 98A as an alternate route of Service 98 between Jurong East Int and Jln Ahmad Ibrahim (Loop) during off peak hours.
	2011	17 December	Amended to Jurong East Temp Int.
	2012	25 June	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)	2016	26 June	Operations transferred to Tower Transit Singapore.

Service 99

Operator	Year	Date	Service changes
	1985	30 June	Introduced between Jurong East Int and Boon Lay Dr (Loop).
	1988	13 March	Extended to start from Clementi Int and extended to loop at Jurong West St 91.
		24 April	Serves new pair of bus stops before and after Upp Jurong Rd along Pioneer Rd North.
	1991	19 May	Amended to ply Jurong West Ave 5 and Jurong West St 72, skipping Pioneer Rd North.
Template:SBS Transit (Current)	2003	TBC	Serves additional bus stop outside Blk 673C along Jurong West St 72.
	2006	29 October	Amended to Clementi Temp Int.
	2007	15 July	Serves new bus stop outside Blk 207 along Boon Lay Pl.
	2011	27 June	Designated wheelchair-accessible bus service (WAB).
		26 November	Amended to Clementi Integrated Transport Hub.
	2015	21 November	Extended to Joo Koon Integrated Transport Hub, skipping Jurong West St 92.

Service 100

Operator	Service Gen	Year	Date	Service changes
Singapore Traction Company	1st Gen (1971)	1971	11 April	Introduced between Serangoon Garden Ter and Prince Edward Rd Ter under 1971 Bus Reorganisation.
			9 May	Integrated with Service 100A and re-numbered Service 100/100A.
	2nd Gen (Since 1974)	1974	3 February	Re-numbered from Service 100/100A as a service between Serangoon Garden Ter and Prince Edward Rd Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	2 March	Amended to ply Sims Ave towards Serangoon Garden Ter with the conversion of Geylang Rd to one-way traffic.
			21 July	Amended to ply St. Andrew's Rd and Stamford Rd, skipping Coleman St and Hill St.
		1976	15 February	Serves new staggered bus stop between Bank of India and Hong Leong Holdings along Robinson Rd.
			14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
			16 August	Amended to ply Aljunied Rd with the introduction of Service 60, skipping MacPherson Est in both directions.
		1977	31 October	Amended to skip Chartwell Dr, Burghley Dr, Berwick Dr, Tavistock Ave, Hemsley Ave and Kensington Park Rd with the introduction of Service 217.
		1985	13 January	Extended to World Trade Ctr Ter.
		1988	3 January	Serves new staggered bus stop opposite Treasury Bldg along Shenton Way, skipping the bus stop opposite Marina House.
			13 March	Amended to Serangoon Int.
		1989	5 November	Integrated with Service 20, extended to Ghim Moh Ter and amended to ply Beach Rd, skipping North Bridge Rd/Victoria St.
		1994	3 July	Amended to ply Crawford St towards Serangoon Int.
		1996	TBC	Serves additional bus stop outside Kallang Stn along Sims Ave.
		1999	TBC	Skips abolished pair of bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
Template:SBS Transit (Current)		2002	TBC	Serves new pair of bus stops after Sommerville Rd and after Sunshine Lodge along Upp Serangoon Rd.
		2006	29 October	Serves new bus stop outside VivoCity along Telok Blangah Rd.
		2007	28 April	Serves additional bus stop outside Victoria Concert Hall along Fullerton Rd.
		2008	7 December	Skips abolished bus stop opposite Temenggong D Mosque along Telok Blangah Rd.
		2011	3 September	Amended to Serangoon Integrated Transport Hub.
			26 September	Designated wheelchair-accessible bus service (WAB).
		2016	1 May	Amended to ply Esplanade Dr with the partial closure of Fullerton Rd.
		2017	12 March	Amended to ply Upp Serangoon Rd and the diverted Upp Aljunied Rd.

Service 100/100A

Operator	Year	Date	Service changes
Singapore Traction Company	1971	9 May	Re-numbered from Service 100 as a service between Serangoon Garden Ter and Prince Edward Rd Ter.
Associated Bus Service		6 December	Operations transferred to Associated Bus Service (ABS).
	1974	3 February	Re-numbered Service 100 under 1974 Bus Rationalisation.

Service 100A

Operator	Service Gen	Year	Date	Service changes
Singapore Traction Company	1st Gen (1971)	1971	11 April	Introduced between Serangoon Garden Ter and Finlayson Green (Loop) under 1971 Bus Reorganisation.
			9 May	Integrated with Service 100 and withdrawn.
	2nd Gen (Since 2000)	2000	TBC	Re-introduced as a short-trip service from Serangoon Int to Aljunied Rd (Aljunied Stn) during morning peak hours on weekdays.
Template:SBS Transit (Current)		2002	TBC	Serves new bus stop after Sunshine Lodge along Upp Serangoon Rd.
		2011	3 September	Amended to Serangoon Integrated Transport Hub.
			26 September	Designated wheelchair-accessible bus service (WAB).
		2017	12 March	Amended to ply Upp Serangoon Rd and the diverted Upp Aljunied Rd.

Service 100B

Operator	Year	Date	Service changes
Template:SBS Transit	2003	8 September	Introduced as a short-trip service from Ghim Moh Ter to Telok Blangah Rd (HarbourFront Stn) during morning peak hours on weekdays only.
	2009	TBC	Withdrawn.