History of Services 161 - 170

Service 161 (1971 - 1992)

Operator	Year	Date	Service changes
UBC	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.
	1987	28 June	Amended to Shenton Way Ter.
	1990	21 February	Skips abolished bus stop opposite Jasmine Rd along Upp Thomson Rd.
	1992	20 September	Integrated with Service 167 and withdrawn under TransitLink Network Integration Exercise Phase 9.

Service 161 (since 2002)

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2002	2 June	Introduced between Hougang Central Int and Woodlands Reg Int.
	2007	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).
	2016	12 March	Amended to Woodlands Temp Int.

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.
	1974	3 February	Withdrawn under 1974 Bus Rationalisation.

Service 162 (1977 - 1991)

Operator	Year	Date	Service changes
	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 express sectors along Lor Chuan and Upp Serangoon Rd
	1979	10 September	Serves all bus stops along Lor Chuan and Upp Serangoon Rd.
	1980	6 January	Amended to Ang Mo Kio Ave 3 Ter.
	1981	5 July	Amended to Ang Mo Kio Central 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 Central 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	Withdrawn under TransitLink Network Integration Exercise Phase 1.

Service 162 (since 2001)

Operator	Year	Date	Service changes
	2001	26 February	Introduced between Yio Chu Kang Ter and Shenton Way (Loop) as a semi-express day service on weekdays and Saturdays.
Template:SBS Transit (Current)		17 December	Amended to Shenton Way Ter and 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	19 January	Serves additional pair of bus stops outside One Raffles Link along Nicoll Highway and after Esplanade Bridge along Esplanade Dr.
		2 July	Amended to ply Grange Rd and Orchard Link with the partial closure of Somerset Rd.
	2006	29 October	Serves relocated bus stop outside Orchard Stn along Orchard Turn.
	2011	7 March	Designated wheelchair-accessible bus service (WAB).
	2017	25 June	Amended to the relocated Shenton Way Ter.

Service 162X/162M

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.
Template:SBS Transit (Current)		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 Link 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).

Service 163

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Yio Chu Kang Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		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.
	1981	5 June	Amended to ply the diverted Yio Chu Kang Rd, skipping Ang Mo Kio Ave 9.
	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.
	1989	28 May	Shortened to Marina Ctr Ter.
	1990	21 February	Skips abolished bus stop opposite Jasmine Rd along Upp Thomson Rd.
	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 abolished bus stops before and after Seletar West Farmway 1 along Jln Kayu.
	1999	26 December	Operations transferred to SBS.
Template:SBS Transit (Current)	2002	19 May	Amended to Toa Payoh Integrated Transport Hub.
		29 December	Extended to Sengkang Temp Int.
	2003	18 January	Amended to Sengkang Integrated Transport Hub.
		TBC	Serves new pair of bus stops before and after Fernvale Link along Sengkang West Ave.
	2005	12 March	Amended to ply Fernvale Lane under Sengkang LRT (West Loop) Rationalisation.
		TBC	Skips abolished bus stop outside Muhajirin Mosque 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	Year	Date	Service changes
UBC	1971	6 July	Introduced between Sembawang Hills Dr and Prince Edward Ter.
		4 October	Extended to loop at Tg Pagar Rd.
	1974	3 February	Re-numbered Service 168 under 1974 Bus Rationalization.

Short Trip 163A (since 2019)

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2019	10 February	Introduced from Sengkang Integrated Transport Hub to Fernvale Lane (Bef Sengkang West Rd), operating after the last bus of Service 163 daily. Wheelchair-accessible at launch.

Service 163M

Operator	Year	Date	Service changes
Template:SBS Transit	2008	28 January	Introduced between Sengkang Integrated Transport Hub and Sengkang West Ave (Loop) as a supplementary route variant of Service 163.
	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	10 February	Withdrawn with the introduction of Short-Trip Service 163A.

Service 164

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.
	1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along South Bridge Rd, skipping abolished bus stop opposite Jamae Mosque.
		1 October	Withdrawn.

Service 165

Operator	Year	Date	Service changes
UBC	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.
	1977	19 September	Extended to Ang Mo Kio Ave 3 Ter.
	1978	1 June	Amended to Jurong Int.
	1981	5 July	Amended to Ang Mo Kio Central 2 Ter.
	1983	10 April	Amended to Ang Mo Kio Int.
	1986	1 June	Skips abolished bus stop before Ayer Rajah Rd along Clementi Rd.
	1987	12 August	Skips abolished bus stop after Joan Rd along Lornie Rd.
	1990	21 February	Skips abolished bus stop opposite Jasmine Rd along Upp Thomson Rd.
		1 July	Amended to Boon Lay Int temporarily.
		7 July	Shortened to Clementi Int.
	1995	8 January	Extended to Hougang Central Int.
	1998	24 May	Amended to Hougang Central Temp Int.
			Serves new pair of bus stops outside Blk 836 and outside Blk 830A along Hougang Central.
	2001	20 May	Amended back to Hougang Central Int.
Template:SBS Transit (Current)	2004	TBC	Skips abolished 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	Withdrawn under 1974 Bus Rationalisation.

Service 166 (since 1976)

Operator	Year	Date	Service changes
	1976	22 November	Introduced between Ang Mo Kio Ave 3 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.
	1979	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 Central 2 Ter.
	1983	10 April	Amended to Ang Mo Kio Int.
		TBC	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 South Bridge Rd, skipping abolished bus stop opposite Jamae Mosque.
		27 August	Integrated with Service 146 and extended to Clementi Int.
	1990	21 February	Skips abolished 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 abolished pair of bus stops outside and opposite Wishart Rd along Telok Blangah Rd.
		TBC	Skips temporarily abolished bus stops outside and opposite Sch of Mechanical & Mfg along Commonwealth Ave West.
		TBC	Skips the bus stop outside Plaza By The Park along Bras Basah Rd.
	2001	18 February	Serves the bus stop outside Novena Stn along Thomson Rd, skipping the bus stop outside Novena Church.
		18 October	Serves reinstated bus stops outside Dover Stn along Commonwealth Ave West.
Template:SBS Transit (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 Park 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 abolished bus stop opposite Temenggong D Mosque 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 the bus stop after Hospital Dr along Eu Tong Sen St, skipping the bus stop before Hospital Dr along Kg Bahru Rd.

Service 167

Operator	Year	Date	Service changes
	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.
	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 Rd Ter.
	1980	20 January	Extended to Anson Rd Ter, skipping Lim Teck Kim Rd.
	1983	3 April	Operations transferred to TIBS.
	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 abolished bus stop opposite Jasmine Rd along Upp Thomson Rd.
	1992	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/South Bridge Rd and Tg Pagar Rd.
		TBC	Amended to ply Orchard Link, skipping Grange Rd.
	1995	TBC	Amended to ply Orchard Turn.
	2001	11 February	Amended to ply Canberra Rd and Canberra Link.
	2002	7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
Template:SMRT Buses (Current)	2005	3 May	Serves additional bus stop outside Victoria Concert Hall along Empress Pl.
		2 July	Amended to ply Grange Rd and Orchard Link with the partial closure of Somerset Rd.
		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 abolished bus stop before Hospital Dr along Kg Bahru Rd.
	2019	22 December	Serves new bus stop before Adana @ Thomson along Upp Thomson Rd.
	2020	27 December	Serves a pair of new bus stops opposite and before Canberra Dr along Sembawang Rd.

Service 168 (1974 - 1989)

Operator	Year	Date	Service changes
	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.
	1976	15 February	Extended to Ang Mo Kio Ave 3 Ter and amended to South Canal Rd Ter.
	1978	29 December	Amended to start from Ang Mo Kio Ave 6 Ter, shortened to loop at Orchard Rd and converted to semi-express service.
	1979	TBC	Amended to Ang Mo Kio Ave 3 Ter.
		15 October	Amended to ply Marymount Rd.
	1981	5 July	Amended to Ang Mo Kio Central 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	Withdrawn.

Service 168 (since 2001)

Operator	Year	Date	Service changes
	2001	14 April	Introduced between Bedok Int and Woodlands Reg Int.
		22 July	Amended to ply Jln Kayu in both directions.
Template:SBS Transit (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 abolished bus stops outside and opposite Bedok Green Sec Sch along Bedok North Ave 3.
	2007	24 June	Serves new pair of bus stops outside and opposite Innova JC along Woodlands Ave 2.
	2011	19 November	Amended to Bedok Temp Int.
	2012	11 March	Serves new bus stop outside Blk 204 along Bedok North 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.
	2016	12 March	Amended to Woodlands Temp Int.

Service 169

Operator	Year	Date	Service changes
	1976	23 August	Introduced between Admiralty Rd Ter and Sembawang Rd (Loop).
	1977	31 January	Extended to Ang Mo Kio Ave 3 Ter.
	1980	14 December	Extended to Woodlands Town Ter.
	1981	5 July	Amended to Ang Mo Kio Central 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.
	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.
	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	24 August	Serves the bus stop outside Blk 923 along Yishun Ave 2, skipping the bus stop outside Northpoint Shop Ctr.
Template:SMRT Buses (Current)	2007	28 April	Amended to Ang Mo Kio Integrated Transport Hub.
	2015	11 October	Designated wheelchair-accessible bus service (WAB).
	2016	12 March	Amended to Woodlands Temp Int.
	2018	27 May	Serves new pair of bus stops outside and opposite The Visionaire along Canberra Link.
	2019	2 November	Serves new pair of bus stops outside and opposite Canberra Stn along Canberra Link.
		22 December	Serves new bus stop before Adana @ Thomson along Upp Thomson Rd.

Short Trip 169A

Operator	Year	Date	Service changes
	2000	TBC	Introduced from Woodlands Reg Int to Yishun Ave 2 (Northpoint Shop Ctr) during morning peak hours on weekdays.
	2003	TBC	Amended to terminate at Yishun Ave 2 (Blk 923).
Template:SMRT Buses (Current)	2015	11 October	Designated wheelchair-accessible bus service (WAB).
	2016	12 March	Amended to Woodlands Temp Int.
	2018	27 May	Serves new bus stop opposite The Visionaire along Canberra Link.
	2019	2 November	Serves a new bus stop opposite Canberra Stn along Canberra Link.

Short Trip 169B

Operator	Year	Date	Service changes
Template:SMRT Buses (Current)	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.

Service 170

Operator	Year	Date	Service changes
UBC	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.
	1996	1 January	Amended to Larkin Ter.
	1997	TBC	Serves new pair of bus stops outside KK Women & Child Hosp along Bt Timah Rd.
	2000	TBC	Serves new bus stop before Goldhill Ave along Dunearn Rd.
Template:SBS Transit (Current)	2003	10 November	Amended to ply Jln Lingkaran Dalam towards Larkin Ter, skipping Jln Tun Abdul Razak.
	2010	23 May	Skips temporarily abolished 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 abolished 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.
	2020	18 March	Temporarily shortened to loop at Woodlands Centre 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 Centre 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 Centre 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 Centre 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 Centre 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.

Short Trip 170A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2015	27 December	Introduced from Queen St Ter to Woodlands Centre Rd (Woodlands Train Checkpt).
	2016	11 December	Serves new bus stop opposite Blk 635A along Woodlands Rd.
	2017	28 May	Skips abolished bus stop opposite Mandai Rd along Woodlands Rd.
		21 August	Designated wheelchair-accessible bus service (WAB).

Service 170X

Operator	Year	Date	Service changes
	2000	3 September	Introduced between Woodlands Rd (Opp Kranji Stn) and Larkin Ter (Johor Bahru).
Template:SBS Transit (Current)	2003	10 November	Amended to Kotaraya II Ter via Jln Gertak Merah, skipping Jln Tun Abdul Razak.
	2008	16 December	Serves additional bus stop outside JB Sentral along Jln Tun Abdul Razak towards Kotaraya II Ter.
	2014	1 November	Amended to loop at Jln Tun Abdul Razak with the permanent closure of Kotaraya II Ter.
	2015	1 March	Amended to JB Sentral Ter, skipping Jln Tun Abdul Razak.
	2017	21 August	Designated wheelchair-accessible bus service (WAB).
	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.