History of Services 161 - 170

Service 161 (1971 - 1992)

Operator	Route	Year	Date	Service changes
UBC	Sembawang Rd End ↔ Prince Edward (1971 - 1987)	1971	11 April	Introduced between Sembawang Rd End Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		1974	8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1976	14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
		1978	5 March	Amended to ply Keng Lee Rd with the partial conversion of Kg Java Rd to one-way traffic.
			3 December	Amended to ply Mayne Rd and Bt Timah Rd with the partial conversion of Mackenzie Rd to two-way traffic.
		1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
			28 October	Amended to ply Sungei Rd (towards Prince Edward Ter) and Bt Timah Rd (towards Sembawang Rd End Ter) with the partial conversion of Bt Timah Rd to two-way traffic and Rochor Canal Rd to one-way traffic, skipping Mackenzie Rd and Mayne Rd.
		1983	8 May	Operations transferred to TIBS.
	Sembawang Rd End ↔ Shenton Way (1987 - 1992)	1987	28 June	Amended to Shenton Way Ter.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
		1992	20 September	Integrated with Service 167 and discontinued under TransitLink Network Integration Exercise Phase 9.

Service 161 (since 2002)

Operator	Route	Year	Date	Service changes
(Current)	Hougang Ctrl ↔ Woodlands (2002 - 2016)	2002	2 June	Introduced between Hougang Ctrl Int and Woodlands Reg Int.
		2007	TBC	First bus from Woodlands Reg Int brought forward to 0545 hrs on weekdays.
			24 June	Serves new pair of bus stops outside and opposite Innova JC along Woodlands Ave 2.
		2014	23 March	Designated wheelchair-accessible bus service (WAB).
	Hougang Ctrl ↔ Woodlands Temp Int (2016 - 2021)	2016	12 March	Amended to Woodlands Temp Int.
	Hougang Ctrl ↔ Woodlands (since 2021)	2021	13 June	Amended to Woodlands Integrated Transport Hub.
		2022	28 August	Temporarily amended to ply Hougang Ave 4 and Hougang Ave 10 with the partial closure of Hougang Ctrl to facilitate the construction of Hougang MRT station on the Cross Island MRT Line.

Service 162 (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Crawford St Ter and Nee Soon Transit Camp (Loop) under 1971 Bus Reorganisation.
		5 July	Amended to ply Old Upp Thomson Rd.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 162 (1977 - 1991)

Operator	Route	Year	Date	Service changes
	Ang Mo Kio Ave 6 ↺ Sims Ave (1977 - 1980)	1977	21 November	Introduced between Ang Mo Kio Ave 6 Ter and Sims Ave (Loop).
		1978	29 December	Coverted to a semi-express service and amended to ply Lor Chuan and Upp Serangoon Rd.
		1979	10 September	Serves all bus stops along Lor Chuan and Upp Serangoon Rd.
	Ang Mo Kio ↺ Sims Ave (1980 - 1991)	1980	6 January	Amended to Ang Mo Kio Ave 3 Ter.
		1981	10 May	Skips bus stop before Braddell Flyover along Braddell Rd.
			5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1982	11 June	Amended to ply Bendemeer Rd and Geylang Bahru, skipping Jln Kolam Ayer.
		1983	6 February	Amended to ply CTE towards Ang Mo Kio Ctrl 2 Ter with the closure of temporary slip road between Braddell Rd and Lor Chuan.
			10 April	Amended to Ang Mo Kio Int.
			20 June	Amended to ply CTE towards Sims Ave.
		1986	16 March	Integrated with Service 77 and amended to ply Boundary Rd, Serangoon Ave 2 and Upp Serangoon Rd, skipping CTE and Braddell Rd.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

Service 162 (since 2001)

Operator	Route	Year	Date	Service changes
	Yio Chu Kang ↺ Shenton Way (Feb - Dec 2001)	2001	26 February	Introduced between Yio Chu Kang Ter and Shenton Way (Loop) as a semi-express day service on weekdays and Saturdays.
(Current)	Yio Chu Kang ↔ Shenton Way (Dec 2001 - 2023)		17 December	Amended to Shenton Way Ter and converted to trunk service, serving all bus stops along Bishan Rd and Upp Thomson Rd.
		2002	TBC	First bus from Yio Chu Kang Ter brought forward to 0545 hrs on weekdays.
			7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
		2005	19 February	Serves additional pair of bus stops outside One Raffles Lk along Nicoll Highway and after Esplanade Bridge along Esplanade Dr.
			2 July	Amended to ply Grange Rd and Orchard Lk with the partial closure of Somerset Rd.
		2006	29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
		2008	TBC	First bus from Yio Chu Kang Ter brought forward to 0530 hrs on weekdays.
		2011	7 March	Designated wheelchair-accessible bus service (WAB).
		2017	25 June	Amended to the relocated Shenton Way Ter.
		2018	11 March	Last bus from Shenton Way Ter extended to 1430 hrs on Saturdays.
		2020	8 November	Skips the bus stop opposite SLF Cplx along Thomson Rd to facilitate the construction of the North-South Corridor (NSC).
		2023	8 January	Skips the bus stop outside Newton Stn Exit B along Scotts Rd temporarily to facilitate upgrading works.
			27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.
	Yio Chu Kang ↺ Sin Ming Ave (since 2023)		17 December	Shortened to loop at Sin Ming Dr from Yio Chu Kang Int under Thomson-East Coast Line Bus Rationalisation.
				Integrated with Service 162M and converted to a full day service, operating daily.

Short Trip 162A (2004 - 2008)

Operator	Year	Date	Service changes
	2004	5 April	Introduced from Yio Chu Kang Ter to Sin Ming Ave (Ai Tong Sch) during morning peak hours on weekdays.
	2008	25 February	Discontinued.

Service 162X/162M (2001 - 2023)

Operator	Year	Date	Service changes
	2001	25 February	Introduced between Yio Chu Kang Ter and Temasek Ave (Loop) as an alternate route of Service 162, operating during off peak periods on weekdays and Saturdays and throughout the day on Sundays and Public Holidays, numbered as Service 162X.
		16 December	Converted to trunk service, serving all bus stops along Bishan Rd and Upp Thomson Rd.
	2002	7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
	2005	2 July	Amended to ply Grange Rd and Orchard Lk with the partial closure of Somerset Rd.
	2006	29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
	2008	28 January	Re-numbered Service 162M.
	2011	7 March	Designated wheelchair-accessible bus service (WAB).
	2020	8 November	Skips the bus stop opposite SLF Cplx along Thomson Rd to facilitate the construction of the North-South Corridor (NSC).
	2023	8 January	Skips the bus stop outside Newton Stn Exit B along Scotts Rd temporarily to facilitate upgrading works.
		27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.
		17 December	Integrated with Service 162 and discontinued under Thomson-East Coast Line Bus Rationalisation.

Service 163

Operator	Route	Year	Date	Service changes
UBC	Upp Thomson Rd ↔ Prince Edward (Apr - Oct 1971)	1971	11 April	Introduced between Yio Chu Kang Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Jln Kayu ↔ Prince Edward (Oct 1971 - 1985)		4 October	Extended to Jln Kayu Ter.
		1974	8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1975	19 July	Amended to ply Coleman St and Hill St, skipping Stamford Rd.
		1976	14 March	Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club.
		1978	5 March	Amended to ply Keng Lee Rd with the partial conversion of Kg Java Rd to one-way traffic.
			3 December	Amended to ply Mayne Rd and Bt Timah Rd with the partial conversion of Mackenzie Rd to two-way traffic.
		1979	11 February	Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd.
			28 October	Amended to ply Sungei Rd (towards Prince Edward Ter) and Bt Timah Rd (towards Jln Kayu Ter) with the partial conversion of Bt Timah Rd to two-way traffic and Rochor Canal Rd to one-way traffic, skipping Mackenzie Rd and Mayne Rd.
		1980	13 October	Amended to ply Ang Mo Kio Ave 9 and Ang Mo Kio Ave 4 with the partial closure of Yio Chu Kang Rd to facilitate redevelopment.
		1981	5 June	Amended to ply the diverted Yio Chu Kang Rd, skipping Ang Mo Kio Ave 9.
	Jln Kayu ↔ World Trade Ctr (1985 - 1989)	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 Hse.
	Jln Kayu ↔ Marina Ctr (1989 - 1992)	1989	28 May	Shortened to Marina Ctr Ter.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
	Jln Kayu ↔ Toa Payoh (1992 - 2002)	1992	3 May	Shortened to Toa Payoh Int under TransitLink Network Integration Exercise Phase 7.
		1995	17 December	Operations transferred to TIBS.
		1998	31 May	Amended to Toa Payoh Temp Int.
				Serves new pair of bus stops outside and opposite Toa Payoh Swim Cplx along Lor 6 Toa Payoh.
			TBC	Skips a pair of temporarily closed bus stops before and after Seletar West Farmway 1 along Jln Kayu.
		1999	26 December	Operations transferred to SBS.
(Current)		2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
	Sengkang ↔ Toa Payoh (since 2002)		29 December	Extended to Sengkang Temp Int.
			31 December	Serves reinstated pair of bus stops before and after Sengkang West Ave along Jln Kayu.
		2003	18 January	Amended to Sengkang Integrated Transport Hub.
			TBC	Serves new pair of bus stops before and after Fernvale Lk along Sengkang West Ave.
		2005	12 March	Amended to ply Fernvale Lane under Sengkang LRT (West Loop) Rationalisation.
			TBC	Skips removed bus stop outside Muhajirin Mque along Braddell Rd.
		2009	22 November	Serves additional bus stop outside Braddell View along Braddell Rd.
		2012	30 September	Designated wheelchair-accessible bus service (WAB).
		2013	13 October	Amended to ply the extended Fernvale Lane with the partial closure of Jln Kayu.
		2019	22 December	Serves new bus stop before Adana @ Thomson along Upp Thomson Rd.

Service 163A (1971 - 1974)

Operator	Route	Year	Date	Service changes
UBC	Sembawang Hills Dr ↔ Prince Edward (Apr - Oct 1971)	1971	6 July	Introduced between Sembawang Hills Dr and Prince Edward Ter.
	Sembawang Hills Dr ↺ Tg Pagar Rd (Oct 1971 - 1974)		4 October	Extended to loop at Tg Pagar Rd.
		1974	3 February	Re-numbered Service 168 under 1974 Bus Rationalization.

Short Trip 163A (2005 - 2008)

Operator	Year	Date	Service changes
	2005	12 March	Introduced from Sengkang West Ave (Bef Fernvale Lane) to Sengkang Int during morning peak hours and between Sengkang Int and Sengkang West Ave (Loop) during evening peak hours on weekdays under the Sengkang LRT (West Loop) Rationalisation, replacing Service 371.
	2008	28 January	Re-numbered Service 163M.

Short Trip 163A (since 2019)

Operator	Route	Year	Date	Service changes
(Current)	Sengkang → Fernvale Lane (since 2019)	2019	10 February	Introduced from Sengkang Int to Fernvale Lane (Bef Sengkang West Rd), operating after the last bus of Service 163 daily. Wheelchair-accessible at launch.

Short Trip 163B

Operator	Route	Year	Date	Service changes
(Current)	Sengkang → Yio Chu Kang Rd (since 2023)	2023	9 October	Introduced from Sengkang Int to Yio Chu Kang Rd (NCS Hub) during morning peak hours on weekdays. Wheelchair-accessible at launch.

Service 163M (2008 - 2019)

Operator	Year	Date	Service changes
	2008	28 January	Converted from Short Trip 163A as a supplementary route variant between Sengkang Int and Sengkang West Ave (Loop).
	2012	30 September	Designated wheelchair-accessible bus service (WAB).
	2013	TBC	Last bus extended to 0035 hrs daily.
		13 October	Amended to ply the extended Fernvale Lane with the partial closure of Jln Kayu.
	2019	10 February	Discontinued with the introduction of Short Trip 163A.

Service 164 (1971 - 1989)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Sembawang Rd End Ter and New Bridge Rd 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	1 November	Operations transferred to SBS.
	1983	8 May	Operations transferred to TIBS.
	1987	6 June	Amended to the relocated New Bridge Rd Ter.
		1 November	Amended to ply Eu Tong Sen St towards Sembawang Rd End Ter to facilitate the second stage of road expansion along New Bridge Rd.
	1988	20 March	Amended to ply New Bridge Rd, skipping Upp Pickering St, Sth Bridge Rd and Neil Rd.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping a removed bus stop opposite Jamae Mque.
		1 October	Discontinued.

Service 165

Operator	Route	Year	Date	Service changes
UBC	Upp Thomson Rd ↔ Jln Boon Lay (1971 - 1977)	1971	11 April	Introduced between Yio Chu Kang Rd Ter and Jln Boon Lay Ter under 1971 Bus Reorganisation.
			28 September	Amended to ply the extended Ganges Ave towards Yio Chu Kang Rd Ter.
		1972	11 June	Amended to ply Upp Cross St with the partial conversion of Havelock Rd to one-way traffic, skipping Upp Hokien St.
		1974	3 February	Amended to ply Lornie Rd, Adam Rd, Farrer Rd, Holland Rd, Ulu Pandan Rd and Clementi Rd under 1974 Bus Rationalization.
	Ang Mo Kio Ave 6 ↔ Jln Boon Lay (1977 - 1978)	1977	19 September	Extended to Ang Mo Kio Ave 6 Ter.
	Ang Mo Kio Ave 6 ↔ Jurong (1978 - 1979)	1978	1 June	Amended to Jurong Int.
	Ang Mo Kio ↔ Jurong (1979 - 1990)	1979	12 August	Amended to Ang Mo Kio Ave 3 Ter.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1986	1 June	Skips removed bus stop before Ayer Rajah Rd along Clementi Rd.
		1987	12 August	Skips removed bus stop after Joan Rd along Lornie Rd.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
	Ang Mo Kio ↔ Boon Lay (Jul 1990)		1 July	Amended to Boon Lay Int temporarily.
	Ang Mo Kio ↔ Clementi (Jul 1990 - 1995)		7 July	Shortened to Clementi Int.
	Hougang Ctrl ↔ Clementi (1995 - 1998)	1995	8 January	Extended to Hougang Ctrl Int.
	Hougang Ctrl Temp Int ↔ Clementi (1998 - 2001)	1998	24 May	Amended to Hougang Ctrl Temp Int.
				Serves new pair of bus stops outside Blk 836 and outside Blk 830A along Hougang Ctrl.
	Hougang Ctrl ↔ Clementi (since 2001)	2001	20 May	Amended back to Hougang Ctrl Int.
			TBC	First bus from Clementi Int brought forward to 0545 hrs on weekdays.
(Current)		2004	TBC	Skips removed bus stop outside Nanyang Pr Sch along Farrer Rd.
		2006	29 October	Amended to Clementi Temp Int.
		2009	19 April	Serves new pair of bus stops outside Blk 834 and outside Hougang Polyclinic along Hougang Ave 4.
		2011	26 November	Amended to Clementi Integrated Transport Hub.
		2012	26 March	Designated wheelchair-accessible bus service (WAB).
		2018	28 October	Amended to ply southbound Lornie Highway with the partial closure of Adam Rd.

Service 166 (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Sembawang Rd End Ter and Nee Soon Rd (loop) under 1971 Bus Reorganisation.
	1974	3 February	Discontinued under 1974 Bus Rationalisation.

Service 166 (since 1976)

Operator	Route	Year	Date	Service changes
	Ang Mo Kio Ave 6 ↔ New Bridge Rd (1976 - 1979)	1976	22 November	Introduced between Ang Mo Kio Ave 6 Ter and New Bridge Rd Ter.
		1978	5 March	Amended to ply Keng Lee Rd with the partial conversion of Kg Java Rd to one-way traffic.
			3 December	Amended to ply Mayne Rd and Bt Timah Rd with the partial conversion of Mackenzie Rd to two-way traffic.
	Ang Mo Kio ↔ New Bridge Rd (1979 - 1984)	1979	12 August	Amended to Ang Mo Kio Ave 3 Ter.
			28 October	Amended to ply Sungei Rd (towards New Bridge Rd Ter) and Bt Timah Rd (towards Ang Mo Kio Ave 3 Ter) with the partial conversion of Bt Timah Rd to two-way traffic and Rochor Canal Rd to one-way traffic, skipping Mackenzie Rd and Mayne Rd.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
	Ang Mo Kio ↔ Labrador (1984 - 1989)	1984	29 January	Extended to Labrador Ter.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Ang Mo Kio Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Ang Mo Kio Int to facilitate the second stage of road expansion along New Bridge Rd.
		1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along Sth Bridge Rd, skipping a removed bus stop opposite Jamae Mque.
	Ang Mo Kio ↔ Clementi (since 1989)		27 August	Integrated with Service 146 and extended to Clementi Int.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
		1998	TBC	Serves additional pair of bus stops outside and opposite Blk 324 along Ang Mo Kio Ave 3.
		1999	TBC	Skips a pair of removed bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
			TBC	Skips temporarily closed bus stops outside and opposite Sch of Mechanical & Mfg along Commonwealth Ave West.
			10 July	Skips the bus stop outside Plaza By The Pk along Bras Basah Rd.
		2000	TBC	Last bus from Clementi Int extended to 2400 hrs on Saturdays.
		2001	18 February	Serves the bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Ch.
			18 October	Serves reinstated bus stops outside Dover Stn along Commonwealth Ave West.
(Current)		2002	24 March	Amended to Ang Mo Kio Temp Int.
		2003	7 December	Serves the bus stop outside Blk 3 along Neil Rd with the abolition of the bus stop outside Everton Pk.
		2005	12 June	Serves new bus stop outside Science Pk along AYE.
			9 October	Serves additional bus stop outside Clarke Quay Stn along Eu Tong Sen St.
		2006	29 October	Amended to Clementi Temp Int.
				Serves new bus stop outside VivoCity along Telok Blangah Rd.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2008	7 December	Skips removed bus stop opposite Temenggong D Mque along Telok Blangah Rd.
		2011	26 June	Serves new bus stop outside The Pinnacle @ Duxton along Neil Rd.
			16 October	Amended to ply Middle Rd, Selegie Rd, Prinsep St and Bras Basah Rd with the partial closure of Bencoolen St to facilitate the construction of Bencoolen MRT station on the Downtown MRT Line.
			26 November	Amended to Clementi Integrated Transport Hub.
		2012	30 September	Designated wheelchair-accessible bus service (WAB).
		2016	11 December	Amended to ply the reinstated Bencoolen St, skipping Middle Rd, Selegie Rd, Prinsep St and Bras Basah Rd.
		2017	26 November	Serves bus stop after Hosp Dr along Eu Tong Sen St with the removal of the bus stop before Hosp Dr along Kg Bahru Rd.
		2020	8 November	Skips the bus stop opposite SLF Cplx along Thomson Rd to facilitate the construction of the North-South Corridor (NSC).

Service 167

Operator	Route	Year	Date	Service changes
	Rotherham Gate ↔ New Bridge Rd (1974 - 1976)	1974	3 February	Re-numbered from Service 160A as a service between Rotherham Gate Ter and New Bridge Rd Ter under 1974 Bus Rationalisation.
			24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Rotherham Gate Ter with the conversion of Orchard Rd to one-way traffic.
	Admiralty Rd West ↔ Tg Pagar Rd (1976 - 1979)	1976	23 August	Amended to Admiralty Rd West Ter and Tg Pagar Ter.
		1979	1 August	Amended to temporary terminal along Lim Teck Kim Rd with the closure of Tg Pagar Ter.
	Admiralty Rd West ↔ Anson Rd (1979 - 1985)		23 December	Amended to Anson Rd Ter.
		1980	20 January	Amended to ply Hoe Chiang Rd towards Anson Rd Ter, skipping Lim Teck Kim Rd.
		1983	3 April	Operations transferred to TIBS.
	Admiralty Rd West ↔ World Trade Ctr (1985 - 1992)	1985	13 January	Extended to World Trade Ctr Ter.
		1987	27 September	Amended to ply the extended Eu Tong Sen St towards Admiralty Rd West Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Admiralty Rd West Ter to facilitate the second stage of road expansion along New Bridge Rd.
			13 December	Serves new staggered bus stop outside Orchard Stn along Orchard Blvd, skipping the bus stop opposite Orchard Stn.
				Serves new bus stop outside Newton Stn along Scotts Rd.
		1990	21 February	Skips removed bus stop opposite Jasmine Rd along Upp Thomson Rd.
		1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
	Sembawang Rd End ↔ Bukit Merah (1992 - 2005)		20 September	Integrated with Services 161 and 850, extended to Sembawang Rd End Ter, extended to Bt Merah Int and amended to ply Cecil St/Shenton Way under TransitLink Network Integration Exercise Phase 9, skipping Eu Tong Sen St/Sth Bridge Rd and Tg Pagar Rd.
		1995	7 May	Amended to ply Orchard Turn.
		2001	11 February	Amended to ply Canberra Rd and Canberra Lk.
		2002	7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
		2005	3 May	Serves additional bus stop outside Victoria Concert Hall along Empress Pl.
			2 July	Amended to ply Grange Rd and Orchard Lk with the partial closure of Somerset Rd.
	Sembawang ↔ Bukit Merah (since 2005)		20 November	Amended to Sembawang Int.
		2006	18 February	Serves additional bus stop after Hosp Dr along Eu Tong Sen St.
			29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
		2012	15 November	Designated wheelchair-accessible bus service (WAB).
		2016	1 May	Amended to ply Esplanade Dr with the partial closure of Fullerton Rd.
		2017	26 November	Skips removed bus stop before Hosp Dr along Kg Bahru Rd.
		2019	22 December	Serves new bus stop before Adana @ Thomson along Upp Thomson Rd.
		2020	8 November	Skips the bus stop opposite SLF Cplx along Thomson Rd to facilitate the construction of the North-South Corridor (NSC).
			27 December	Serves a pair of new bus stops opposite and before Canberra Dr along Sembawang Rd.
(Current)		2021	3 October	Operations transferred to Tower Transit Singapore.
			26 December	Amended to ply Esplanade Dr towards Bt Merah Int with the closure of Connaught Dr.
		2023	8 January	Skips the bus stop outside Newton Stn Exit B along Scotts Rd temporarily to facilitate upgrading works.
			27 August	Serves reinstated bus stop outside Newton Stn Exit B along Scotts Rd.
			17 December	Operates at a reduced frequency of 30-minute intervals daily under Thomson-East Coast Line Bus Rationalisation.

Service 168 (1974 - 1989)

Operator	Route	Year	Date	Service changes
	Sembawang Hills Dr ↔ Tg Pagar Rd (1974 - 1976)	1974	3 February	Re-numbered from Service 163A as a service between Sembawang Hills Dr and Tg Pagar Rd Ter under 1974 Bus Rationalisation.
			24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Sembawang Hills Dr with the conversion of Orchard Rd to one-way traffic.
	Ang Mo Kio Ave 6 ↺ South Canal (1976 - 1978)	1976	15 February	Extended to Ang Mo Kio Ave 6 Ter and amended to Sth Canal Ter.
	Ang Mo Kio Ave 6 ↺ Orchard Rd (1978 - 1979)	1978	29 December	Shortened to loop at Orchard Rd from Ang Mo Kio Ave 6 Ter and converted to semi-express service.
	Ang Mo Kio ↺ Orchard Rd (1979 - 1989)	1979	12 August	Amended to Ang Mo Kio Ave 3 Ter.
			15 October	Amended to ply Marymount Rd.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
		1983	10 April	Amended to Ang Mo Kio Int.
		1987	13 December	Serves new staggered bus stop outside Orchard Stn along Orchard Blvd, skipping the bus stop opposite Orchard Stn.
				Serves new bus stop outside Newton Stn along Scotts Rd.
		1989	11 June	Discontinued.

Service 168 (since 2001)

Operator	Route	Year	Date	Service changes
	Bedok ↔ Woodlands (2001 - 2016)	2001	14 April	Introduced between Bedok Int and Woodlands Reg Int.
			22 July	Amended to ply Jln Kayu in both directions.
(Current)		2002	TBC	Serves new pair of bus stops before and after Tampines Ave 9 along Tampines Ave 10.
		2003	TBC	Serves new pair of bus stops before and after TPE along Tampines Ave 10.
		2006	TBC	Skips a pair of removed bus stops outside and opposite Bedok Green Sec Sch along Bedok Nth Ave 3.
			TBC	First bus from Woodlands Reg Int brought forward to 0600 hrs on Sundays and Public Holidays.
		2007	24 June	Serves new pair of bus stops outside and opposite Innova JC along Woodlands Ave 2.
		2008	TBC	First bus from Bedok Int brought forward to 0600 hrs on Sundays and Public Holidays.
		2011	19 November	Amended to Bedok Temp Int.
		2012	11 March	Serves new bus stop outside Blk 204 along Bedok Nth Int.
			26 March	Designated wheelchair-accessible bus service (WAB).
		2014	5 October	Serves additional pair of bus stops before and after Punggol Rd along TPE.
			30 November	Amended to Bedok Integrated Transport Hub.
		2015	8 November	Serves new pair of bus stops outside and opposite CityLife @ Tampines along Tampines Ave 9.
	Bedok ↔ Woodlands Temp Int (2016 - 2021)	2016	12 March	Amended to Woodlands Temp Int.
	Bedok ↔ Woodlands (since 2021)	2021	13 June	Amended to Woodlands Integrated Transport Hub.
			12 December	Serves new pair of bus stops before and after Heartbeat @ Bedok along Bedok Nth St 1.
		2023	8 October	First bus from Bedok Int brought forward to 0530 hrs on Sundays and Public Holidays.
		2024	19 May	First bus from Woodlands Int brought forward to 0545 hrs on Sundays and Public Holidays.

Short Trip 168A (since 2024)

Operator	Route	Year	Date	Service changes
(Current)	Woodlands → Tampines Ave 4 (since 2024)	2024	13 May	Introduced from Woodlands Int to Tampines Ave 4 (Opp Tampines Stn/Int) during peak hours on weekdays and Saturdays. Wheelchair-accessible at launch.

Service 169

Operator	Route	Year	Date	Service changes
	Marsiling ↺ Sembawang Rd (1976 - 1977)	1976	23 August	Introduced between Admiralty Rd Ter and Sembawang Rd (Loop).
	Marsiling ↔ Ang Mo Kio Ave 6 (1977 - 1979)	1977	31 January	Extended to Ang Mo Kio Ave 6 Ter.
	Marsiling ↔ Ang Mo Kio (1979 - 1980)	1979	12 August	Amended to Ang Mo Kio Ave 3 Ter.
	Woodlands Ctr ↔ Ang Mo Kio (1980 - 1996)	1980	14 December	Extended to Woodlands Town Ter.
		1981	5 July	Amended to Ang Mo Kio Ctrl 2 Ter.
			29 November	Amended to Woodlands Int and amended to ply Admiralty Rd, skipping Marsiling Dr.
		1983	10 April	Amended to Ang Mo Kio Int.
			5 June	Operations transferred to TIBS.
	Woodlands ↔ Ang Mo Kio (1996 - 2016)	1996	4 February	Amended to Woodlands Reg Int.
			10 March	Integrated with Service 857 and amended to ply Admiralty Rd West, Admiralty Rd East, Sembawang Rd, Yishun Ave 2 and Yishun Ave 3 under Woodlands MRT Rationalisation, skipping Canberra Rd.
		1999	TBC	First bus from Woodlands Reg Int brought forward to 0530 hrs on Sundays and Public Holidays.
		2000	TBC	Serves additional bus stop opposite Blk 324 along Ang Mo Kio Ave 3.
		2002	24 March	Amended to Ang Mo Kio Temp Int.
		2003	TBC	Serves the bus stop outside Blk 923 along Yishun Ave 2, skipping the bus stop outside Northpoint Shop Ctr.
		2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
		2015	11 October	Designated wheelchair-accessible bus service (WAB).
	Woodlands Temp Int ↔ Ang Mo Kio (2016 - 2021)	2016	12 March	Amended to Woodlands Temp Int.
		2018	27 May	Serves new pair of bus stops outside and opposite The Visionaire along Canberra Lk.
		2019	2 November	Serves new pair of bus stops outside and opposite Canberra Stn along Canberra Lk.
			22 December	Serves new bus stop before Adana @ Thomson along Upp Thomson Rd.
	Woodlands ↔ Ang Mo Kio (since 2021)	2021	13 June	Amended to Woodlands Integrated Transport Hub.
(Current)			19 September	Operations transferred to Tower Transit Singapore.

Short Trip 169A

Operator	Route	Year	Date	Service changes
	Woodlands → Yishun Ave 2 (2000 - 2016)	2000	TBC	Introduced from Woodlands Reg Int to Yishun Ave 2 (Northpoint Shop Ctr) during morning peak hours on weekdays.
		2003	TBC	Terminating stop changed to Yishun Ave 2 (Blk 923).
		2015	11 October	Designated wheelchair-accessible bus service (WAB).
	Woodlands Temp Int → Yishun Ave 2 (2016 - 2021)	2016	12 March	Amended to Woodlands Temp Int.
		2018	27 May	Serves new bus stop opposite The Visionaire along Canberra Lk.
		2019	2 November	Serves a new bus stop opposite Canberra Stn along Canberra Lk.
	Woodlands → Yishun Ave 2 (since 2021)	2021	13 June	Amended to Woodlands Integrated Transport Hub.
(Current)			19 September	Operations transferred to Tower Transit Singapore.

Short Trip 169B

Operator	Route	Year	Date	Service changes
	Woodlands Temp Int → Woodlands Ave 8 (2019 - 2021)	2019	25 February	Introduced from Woodlands Temp Int to Woodlands Ave 8 (Bef Admiralty Rd West) during morning peak hours on weekdays. Wheelchair-accessible at launch.
	Woodlands → Woodlands Ave 8 (since 2021)	2021	13 June	Amended to Woodlands Integrated Transport Hub.
(Current)			19 September	Operations transferred to Tower Transit Singapore.

Service 170

Operator	Route	Year	Date	Service changes
UBC	Queen St ↔ Johore Bahru (1971 - 1995)	1971	11 April	Introduced between Queen St Ter and Johore Bahru Ter as a cross border service under 1971 Bus Reorganisation.
		1979	28 October	Amended to ply Sungei Rd and Ophir Rd (towards Queen St Ter) and amended to ply Rochor Canal Rd and Bt Timah Rd, skipping Bencoolen St, Middle Rd, Selegie Rd and Mackenzie Rd (towards Johore Bahru Ter) with the conversion of Rochor Canal Rd and Rochor Rd to one-way traffic.
			30 December	Amended to ply Jln Anak Bt towards Queen St Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1985	13 October	Amended to the relocated Queen St Ter along Ban San St.
	Queen St ↔ Larkin (Johor Bahru) (1996 - 2020)	1996	1 January	Amended to Larkin Ter.
				Last bus from Larkin Ter extended to 0010 hrs on Sundays and Public Holidays.
		1997	TBC	Serves new pair of bus stops outside KK Women & Child Hosp along Bt Timah Rd.
		1999	19 July	Serves new bus stop outside Woodlands CIQ along Woodlands Rd.
		2000	TBC	Serves new bus stop before Goldhill Ave along Dunearn Rd.
(Current)		2003	10 November	Amended to ply Jln Lingkaran Dalam towards Larkin Ter, skipping Jln Tun Abdul Razak.
		2006	TBC	Last bus from Larkin Ter extended to 0030 hrs on Sundays and Public Holidays.
		2010	23 May	Skips temporarily closed bus stop outside Assumption Voc Inst along Upp Bt Timah Rd to facilitate the construction of Cashew MRT station along the Downtown MRT Line.
		2011	4 September	Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
		2015	1 March	Serves reinstated bus stop outside Assumption Pathway Sch along Upp Bt Timah Rd.
		2016	11 December	Serves new bus stop opposite Blk 635A along Woodlands Rd.
		2017	28 May	Skips removed bus stop opposite Mandai Rd along Woodlands Rd.
			21 August	Designated wheelchair-accessible bus service (WAB).
		2018	10 June	Serves new bus stop before Yew Tee Flyover along Woodlands Rd.
			28 October	Skips bus stop before Winstedt Rd along Bt Timah Rd with the relocation of the bus stop outside Newton FC.
		2019	24 February	Serves reinstated bus stop before Winstedt Rd along Bt Timah Rd with the reversion in the relocation of the bus stop outside Newton FC.
	Queen St ↺ Woodlands Ctr Rd (2020 - Apr 2022)	2020	18 March	Temporarily shortened to loop at Woodlands Ctr Rd from Queen St Ter due to Movement Control Order in Malaysia until 31 March 2020, skipping Woodlands Crossing, Johor Bahru and Larkin Ter.
			1 April	Temporary amendment to loop at Woodlands Ctr Rd from Queen St Ter due to Movement Control Order in Malaysia extended until 14 April 2020.
			15 April	Temporary amendment to loop at Woodlands Ctr Rd from Queen St Ter due to Movement Control Order in Malaysia extended until 28 April 2020.
			29 April	Temporary amendment to loop at Woodlands Ctr Rd from Queen St Ter due to Movement Control Order in Malaysia extended until 12 May 2020.
			13 May	Temporary amendment to loop at Woodlands Ctr Rd from Queen St Ter due to Movement Control Order in Malaysia extended until further notice.
		2021	11 April	Amended to ply the extended southbound Upp Bt Timah Rd towards Queen St Ter, skipping Jln Anak Bt.
	N/A	2022	1 April	Temporary suspension of service with the conversion of Short Trip 170A to a bi-directional service until further notice.
	Queen St ↔ Larkin (Johor Bahru) (since May 2022)		1 May	Resumed normal operations between Queen St Ter and Larkin Ter.
		2024	1 September	Amended to ply Arab St, Weld Rd and Jln Besar towards Larkin Ter with the partial closure of Queen St to facilitate the construction of the North-South Corridor (NSC), skipping Rochor Rd.

Short Trip 170A (2015 - 2022)

Operator	Route	Year	Date	Service changes
	Queen St → Woodlands Ctr Rd (2015 - 2021)	2015	27 December	Introduced as a full day short-trip service from Queen St Ter to Woodlands Ctr Rd (Woodlands Train Checkpt).
		2016	11 December	Serves new bus stop opposite Blk 635A along Woodlands Rd.
		2017	28 May	Skips removed bus stop opposite Mandai Rd along Woodlands Rd.
			21 August	Designated wheelchair-accessible bus service (WAB).
		2018	28 October	Skips bus stop before Winstedt Rd along Bt Timah Rd with the relocation of the bus stop outside Newton FC.
		2019	24 February	Serves reinstated bus stop before Winstedt Rd along Bt Timah Rd with the reversion in the relocation of the bus stop outside Newton FC.
	N/A	2021	19 May	Temporary suspension of service due to Phase 2 (Heightened Alert) measures in Singapore.
	Queen St ↔ Woodlands Ctr Rd (Apr 2022)	2022	1 April	Resumed normal operations.
				Converted to bi-directional service between Queen St Ter and Woodlands Centre Rd (Woodlands Train Checkpt).
			1 May	Discontinued.

Service 170X

Operator	Route	Year	Date	Service changes
	Kranji Stn ↔ Larkin (Johor Bahru) (2000 - 2003)	2000	3 September	Introduced between Woodlands Rd (Opp Kranji Stn) and Larkin Ter (Johor Bahru).
(Current)	Kranji Stn ↔ Kotaraya II (Johor Bahru) (2003 - 2014)	2003	10 November	Amended to Kotaraya II Ter via Jln Gertak Merah, skipping Jln Tun Abdul Razak.
		2008	TBC	Last bus from Woodlands Rd (Opp Kranji Stn) revised to 2310 hrs on Saturdays.
			16 December	Serves additional bus stop outside JB Sentral along Jln Tun Abdul Razak towards Kotaraya II Ter.
		2009	11 May	Last bus from Woodlands Rd (Opp Kranji Stn) revised to 2330 hrs on weekdays and 2400 hrs on Saturdays.
	Kranji Stn ↺ JB Sentral (Johor Bahru) (2014 - 2015)	2014	1 November	Amended to loop at Jln Tun Abdul Razak with the permanent closure of Kotaraya II Ter.
	Kranji Stn ↔ JB Sentral (Johor Bahru) (2015 - 2020)	2015	1 March	Amended to JB Sentral Ter, skipping Jln Tun Abdul Razak.
		2017	21 August	Designated wheelchair-accessible bus service (WAB).
	N/A	2020	18 March	Service temporarily suspended due to Movement Control Order in Malaysia until 31 March 2020.
			1 April	Temporary suspension of service due to Movement Control Order in Malaysia extended until 14 April 2020.
			15 April	Temporary suspension of service due to Movement Control Order in Malaysia extended until 28 April 2020.
			29 April	Temporary suspension of service due to Movement Control Order in Malaysia extended until 12 May 2020.
			13 May	Temporary suspension of service due to Movement Control Order in Malaysia extended until further notice.
	Kranji Stn ↔ JB Sentral (Johor Bahru) (since 2022)	2022	1 May	Resumed normal operations.