History of Services 170 - 179

Service 170

Operator	Route	Year	Date	Service changes
United Bus Company	Queen St ↔ Johore Bahru	1971	11 April	Introduced between Queen St Ter and Johore Bahru Ter as a cross border service under 1971 Bus Reorganisation.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
		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	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.
	170Queen St ↔ Larkin (Johor Bahru)
			3 September	170Designated with red plate.
		2003	10 November	Amended to ply Jln Lingkaran Dalam towards Larkin Ter, skipping Jln Tun Abdul Razak.
		2010	23 May	Skips temporarily closed bus stop outside Assumption Voc Inst along Upp Bt Timah Rd to facilitate the construction of Cashew station along the Downtown Line.
		2011	4 September	Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd.
	170Queen St ↔ Larkin (Johor Bahru)	2014	March	170 170Introduction of Scania K230UB buses (with electronic displays) to replace Volvo B10M buses (without electronic displays).
		2015	1 March	Serves reinstated bus stop outside Assumption Pathway Sch along Upp Bt Timah Rd.
	170Queen St ↔ Larkin (Johor Bahru) 170AQueen St → Woodlands Ctr Rd		27 December	170AIntroduced 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	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 outside Newton FC.
	170Queen St ↺ Woodlands Ctr Rd 170AQueen St → Woodlands Ctr Rd	2020	18 March	170Temporarily shortened to loop at Woodlands Ctr Rd from Queen St Ter due to Movement Control Order in Malaysia, skipping Woodlands Crossing, Johor Bahru and Larkin Ter.
		2021	11 April	Amended to ply the extended southbound Upp Bt Timah Rd towards Queen St Ter, skipping Jln Anak Bt.
	170Queen St ↺ Woodlands Ctr Rd		19 May	170ATemporary suspension of service due to Phase 2 (Heightened Alert) measures.
	170AQueen St ↔ Woodlands Ctr Rd	2022	1 April	170Temporary suspension of service.
				170AResumed normal operations but converted to bi-directional service between Queen St Ter and Woodlands Centre Rd (Woodlands Train Checkpt).
	170Queen St ↔ Larkin (Johor Bahru)		1 May	170Resumed normal operations between Queen St Ter and Larkin Ter.
				170ADiscontinued.
		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.

Service 170X

Operator	Route	Year	Date	Service changes
(Current) Known as prior to 1 November 2001	170Kranji Stn ↔ Larkin (Johor Bahru)	2000	3 September	170Introduced between Woodlands Rd (Opp Kranji Stn) and Larkin Ter (Johor Bahru), designated with blue plate.
	170Kranji Stn ↔ Kotaraya II (Johor Bahru)	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.
	170XKranji Stn ↺ JB Sentral (Johor Bahru)	2014	March	170 170XIntroduction of Scania K230UB buses (with electronic displays) to replace Volvo B10M buses (without electronic displays).
			1 November	Amended to loop at Jln Tun Abdul Razak with the permanent closure of Kotaraya II Ter.
	170XKranji Stn ↔ JB Sentral (Johor Bahru)	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.
	170XKranji Stn ↔ JB Sentral (Johor Bahru)	2022	1 May	Resumed normal operations.
		2023	TBC	1st bus from JB Sentral Ter revised to 0828 hrs on weekdays and ceased operations from JB Sentral Ter between 1636 hrs & 2009 hrs from Mondays to Thursdays.
		2024	TBC	Revised to cease operations after 1630 hrs on Fridays, and throughout the day on Saturdays, Sundays & Public Holidays.

Service 171

Operator	Route	Year	Date	Service changes
United Bus Company	Sembawang ↔ Queen St	1971	11 April	Introduced between Sembawang Ter and Queen St Ter under 1971 Bus Reorganisation.
		1973	25 June	Amended to ply Mandai Lake Rd in both directions until 2200 hours daily.
			1 July	Operations transferred to Singapore Bus Services.
		1979	28 October	Amended to ply Sungei Rd, Ophir Rd and Ban San St (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 Sembawang 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.
		1984	15 April	Amended to ply Scotts Rd, Orchard Rd and Victoria St/Nth Bridge Rd, skipping Bt Timah Rd and Sungei Rd/Rochor Canal Rd.
		1985	13 October	Amended to the relocated Queen St Ter along Ban San St, skipping Arab St.
	Yishun ↔ Queen St	1987	18 January	Amended to Yishun Ctrl Ter.
			23 August	Amended to Yishun Int.
			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.
		1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
	Yishun ↔ Marina Ctr	1993	3 January	Extended to Marina Ctr Ter and amended to ply Bt Panjang Rd, Pending Rd and Cashew Rd under TransitLink Network Integration Exercise Phase 11.
		1994	26 April	Amended to skip Mandai Lake Rd and amended to ply Mandai Ave with the introduction of Service 138.
		1995	7 May	Amended to ply Orchard Turn.
Known as prior to 10 May 2004			5 November	Operations transferred to Trans Island Bus Services.
				First bus from Yishun Int revised to 0530 hrs daily.
		1999	26 December	Amended to ply BKE, Bt Panjang Rd, Petir Rd, Jelebu Rd under Bukit Panjang LRT Rationalisation, skipping Woodlands Rd and Cashew Rd.
		2000	TBC	Serves new bus stop before Goldhill Ave along Dunearn Rd.
			TBC	Serves additional bus stop opposite Sembawang Air Base along Sembawang Rd.
		2002	TBC	Serves the bus stop outside Blk 923 along Yishun Ave 2, skipping the bus stop outside Northpoint Shop Ctr.
			7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
		2003	TBC	Serves the bus stop outside Northpoint Shop Ctr along Yishun Ave 2, skipping the bus stop outside Blk 923.
		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.
		2009	1 June	Designated wheelchair-accessible bus service (WAB).
			21 June	Serves new pair of bus stops outside and opposite Mandai Crematorium & Columbarium along Mandai Ave.
		2010	23 May	Skips temporarily closed bus stop outside Assumption Voc Inst along Upp Bt Timah Rd to facilitate the construction of Cashew station along the Downtown 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.
			14 March	Amended to Yishun Temp Int.
			27 December	Serves new bus stop outside Blk 184 along Bt Panjang Rd, skipping the bus stop outside Blk 183.
		2017	4 September	Skips a pair of bus stops outside and opposite Bt Panjang Plaza along Jelebu Rd.
		2018	25 February	Serves additional pair of bus stops outside and opposite Blk 180 along Jelebu Rd.
		2019	8 September	Amended to Yishun Integrated Transport Hub.
	Yishun ↺ Upper Bukit Timah Rd	2020	30 August	Shortened to loop at Upp Bt Timah Rd from Yishun Int under Downtown Line 2 Rationalisation.
(Current)		2021	5 September	Operations transferred to Tower Transit Singapore.

Service 172

Operator	Route	Year	Date	Service changes
United Bus Company	Lim Chu Kang ↔ Prince Edward	1971	11 April	Introduced between Lim Chu Kang Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	3 February	Amended to skip Choa Chu Kang Rd End under 1974 Bus Rationalisation.
			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.
		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 with the conversion of Rochor Canal Rd to one-way traffic.
			30 December	Amended to ply Jln Anak Bt towards Prince Edward Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1980	TBC	Amended to ply Bt Timah Rd towards Lim Chu Kang Ter, skipping Mackenzie Rd.
	Lim Chu Kang ↔ Shenton Way	1987	28 June	Amended to Shenton Way Ter.
	Lim Chu Kang ↺ Jln Anak Bt	1991	26 May	Shortened to loop at Jln Anak Bt from Lim Chu Kang Ter under TransitLink Network Integration Exercise Phase 5.
	Boon Lay ↺ Jln Anak Bt	1993	3 January	Amended to Boon Lay Int under TransitLink Network Integration Exercise Phase 11.
		1994	TBC	Amended to ply Sg Tengah Rd with the partial closure of Choa Chu Kang Rd.
		1998	TBC	Serves new pair of bus stops outside and opposite Blk 464 along Choa Chu Kang Ave 3.
(Current) Known as prior to 10 May 2004	Boon Lay ↔ Choa Chu Kang	1999	26 December	Operations transferred to Trans Island Bus Services.
				Shortened to Choa Chu Kang Int under Bukit Panjang LRT Rationalisation.
		2001	TBC	Serves new bus stop outside Sunshine Pl along Choa Chu Kang Ave 3.
		2006	18 June	Amended to Boon Lay Temp Int.
		2009	1 June	Designated wheelchair-accessible bus service (WAB).
			27 December	Amended to Boon Lay Integrated Transport Hub.
		2011	23 October	Skips a pair of removed bus stops after LP 222 and B27 Old Choa Chu Kang Rd along Old Choa Chu Kang Rd.
		2013	24 February	Serves new bus stop outside Blk 293 along Choa Chu Kang Ave 1.
		2018	16 December	Amended to new Choa Chu Kang Int.
		2025	8 June	Skips a pair of removed bus stops opposite and outside Jalan Bahar Power Station and serve relocated bus stop before Nanyang Ave along Jalan Bahar.

Service 173

Operator	Route	Year	Date	Service changes
United Bus Company	Princess Elizabeth ↔ New Bridge Rd	1971	11 April	Introduced between Princess Elizabeth Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Princess Elizabeth Ter with the conversion of Orchard Rd to one-way traffic.
		1979	30 December	Amended to ply Jln Anak Bt towards New Bridge Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1986	16 November	Serves new staggered bus stop outside Thong Teck Bldg along Scotts Rd, skipping the bus stop outside Metro Orchard.
		1987	6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Princess Elizabeth Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Princess Elizabeth 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.
		1989	29 January	Serves relocated bus stop opposite Sri Mariamman Tp along South Bridge Rd, skipping a removed bus stop opposite Jamae Mque.
	Bukit Batok ↺ Jln Anak Bt	1990	11 March	Extended to start from Bt Batok Int and shortened to loop at Jln Anak Bt.
	Bukit Batok ↔ Clementi	1991	7 April	Integrated with Service 205 and extended to Clementi Int under TransitLink Network Integration Exercise Phase 3.
		1992	3 May	Amended to ply the western loop of Bt Batok Ctrl and Bt Batok St 21 under TransitLink Network Integration Exercise Phase 7, skipping Bt Batok East Ave 3.
	Bukit Batok ↺ Clementi	1993	5 December	Converted to loop service between Bt Batok Int and Clementi Int with the introduction of Service 156 under TransitLink Network Integration Exercise Phase 13.
	173Bukit Batok ↺ Clementi 173AJln Anak Bt → Jln Jurong Kechil	1999	TBC	173AIntroduced from Jln Anak Bt (PIE Flyover) to Jln Jurong Kechil (Bef Upp Bt Timah Rd) during morning peak hours on weekdays.
Known as prior to 10 May 2004		2000	24 December	Operations transferred to Trans Island Bus Services.
		2003	12 October	Serves bus stop opposite Bt Timah Plaza along Jln Anak Bt with the removal of the bus stop under the PIE Flyover.
				173AExtended to start at Opposite Bt Timah Plaza with the removal of the bus stop under PIE Flyover.
		2006	16 July	Amended to ply Bt Batok Ave 1 and Bt Batok East Ave 6 and amended to ply Hume Ave, skipping Hillview Rd.
			29 October	Amended to loop at Clementi Temp Int.
	Bukit Batok ↺ Clementi	2007	TBC	173ADiscontinued.
	173Bukit Batok ↺ Clementi 173ABukit Batok → Bt Batok East Ave 4		11 November	173AIntroduced from Bt Batok Int to Bt Batok East Ave 4 (Blk 254), operating after the last bus of Service 173 daily.
		2011	26 November	Amended to loop at Clementi Integrated Transport Hub.
		2013	TBC	173ALast bus extended to 0100 hrs daily.
			21 April	Designated wheelchair-accessible bus service (WAB).
		2015	27 December	Amended to ply the upgraded Upp Bt Timah Rd towards Clementi Int, skipping Jln Anak Bt.
(Current)		2016	29 May	Operations transferred to Tower Transit Singapore.
		2019	5 October	173ALast bus extended to 0110 hrs daily.

Service 174

Operator	Route	Year	Date	Service changes
United Bus Company	Nanyang Technological Institute ↔ New Bridge Rd	1971	11 April	Introduced between Nanyang University Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
(Current) Known as prior to 1 November 2001		1973	1 July	Operations transferred to Singapore Bus Services.
		1974	24 February	Amended to ply Grange Rd, Orchard Blvd and Paterson Rd towards Nanyang University Ter with the conversion of Orchard Rd to one-way traffic.
		1975	9 November	Amended to ply Farrer Rd, Holland Rd and Napier Rd, skipping Stevens Rd and Scotts Rd.
				Amended to realigned Jurong Rd, skipping Old Jurong Rd.
		1977	19 June	Amended to ply Orchard Blvd and Grange Rd towards Nanyang University Ter with the full conversion of Orchard Rd to one-way traffic.
		1979	30 December	Amended to ply Jln Anak Bt towards New Bridge Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1982	23 August	Amended to serve NTI via Nanyang Cres and Nanyang Circle between 0600 hrs and 1800 hrs on weekdays & Saturdays.
		1984	20 October	Amended to ply Bt Batok East Ave 3, Bt Batok St 24, Bt Batok St 23 and interim road with the partial closure of Jurong Rd (between Bt Batok East Ave 3 and Bt Batok St 23).
		1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok East Ave 3 with the partial closure of Jurong Rd.
			30 November	Amended to ply along the new carriageway of Upp Jurong Rd (between Jln Boon Lay and Benoi Rd).
		1986	23 March	Amended to ply Jln Bahar, skipping Upp Jurong Rd.
		1987	22 February	Amended to relocated NTI Ter.
				Amended to ply Nanyang Ave, Nanyang Cres and Nanyang Dr.
			6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to ply the extended Eu Tong Sen St towards Nanyang Technological Institute Ter to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Nanyang Technological Institute Ter 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.
		1990	3 June	Amended to ply Nanyang Circle and Student Wk, skipping Nanyang Ave.
		1991	20 January	Amended to ply Nanyang Dr, skipping Nanyang Cres.
	Boon Lay ↔ New Bridge Rd		7 April	Shortened to Boon Lay Int under TransitLink Network Integration Exercise Phase 3.
		1992	19 July	Amended to ply Orchard Lk due to the closure of Grange Rd to facilitate road expansion works.
		1993	TBC	Amended to ply PIE with the partial closure of Jurong Rd.
		1996	TBC	Serves new bus stop outside Blk 220 along Boon Lay Ave.
		1997	7 December	Amended to ply South Bridge Rd and Kreta Ayer Rd with the partial closure of New Bridge Rd to facilitate the construction of Chinatown station on the North East Line.
		2000	20 February	Serves additional bus stop opposite Blk 333 along Kreta Ayer Rd.
		2002	20 April	Amended to ply Upp Cross St and the reinstated New Bridge Rd, skipping Sth Bridge Rd and Kreta Ayer Rd.
			7 July	Skips the bus stop outside Orchard Emerald along Orchard Rd.
		2003	TBC	Serves new bus stop outside Goh & Goh Bldg along Jln Jurong Kechil.
			7 December	Amended to ply Upp Cross St/Havelock Rd, Chin Swee Rd and Outram Rd.
		2004	TBC	Skips removed bus stop outside Nanyang Pr Sch along Farrer Rd.
		2005	2 July	Amended to ply Grange Rd with the partial closure of Somerset Rd.
		2006	18 June	Amended to Boon Lay Temp Int.
		2008	14 July	Designated wheelchair-accessible bus service (WAB).
		2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	174Boon Lay ↔ New Bridge Rd 174ABoon Lay Int → Bt Batok Ctrl	2010	18 September	174AIntroduced from Boon Lay Int to Bt Batok Ctrl (Opp Blk 628) during the partial full day closure of the North South Line between Jurong East and Bukit Batok stations to facilitate the Jurong East Modification Project (JEMP) until 19 September 2010.
	Boon Lay ↔ New Bridge Rd		20 September	174ADiscontinued.
		2011	14 August	Serves additional bus stop outside Clarke Quay Stn along Eu Tong Sen St.
		2012	9 December	Amended to ply Upp Bt Timah Rd and Bt Timah Lk with the partial closure of Jln Jurong Kechil to facilitate the construction of Beauty World station on the Downtown Line.
		2014	26 January	Amended to ply the reinstated Jln Jurong Kechil, skipping Upp Bt Timah Rd and Bt Timah Lk.
		2017	23 April	Serves new bus stop after Bt Batok West Ave 3 along Bt Batok Rd with the relocation of the bus stop before PIE.
	Boon Lay ↔ Kampong Bahru	2018	10 March	Extended to Kg Bahru Ter with the closure of New Bridge Rd Ter.
				First bus from Kg Bahru Ter brought forward to 0540 hrs daily.
		2020	27 September	Amended to ply PIE with the permanent closure of Jurong Rd.

Service 175

1^st Generation (1971 - 1991)

Operator	Route	Year	Date	Service changes
United Bus Company	Upp Jurong Rd ↔ Prince Edward	1971	11 April	Introduced between Upp Jurong Rd Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		1974	8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1975	9 November	Amended to realigned Jurong Rd, skipping Old Jurong Rd.
		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 with the conversion of Rochor Canal Rd to one-way traffic.
			30 December	Amended to ply Jln Anak Bt towards Prince Edward Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1980	2 January	Amended to the relocated Upp Jurong Rd Ter along Jln Ahmad Ibrahim.
			TBC	Amended to ply Bt Timah Rd towards Upp Jurong Rd Ter, skipping Mackenzie Rd.
	Pioneer Rd ↔ Prince Edward	1983	30 October	Amended to Pioneer Rd Ter.
		1984	20 October	Amended to ply Bt Batok East Ave 3, Bt Batok St 24, Bt Batok St 23 and interim road with the partial closure of Jurong Rd (between Bt Batok East Ave 3 and Bt Batok St 23).
		1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok East Ave 3 with the partial closure of Jurong Rd.
			30 November	Amended to ply along the new carriageway of Upp Jurong Rd (between Jln Boon Lay and Benoi Rd).
		1986	4 May	Amended to skip Jurong Cres.
	Pioneer Rd ↔ Shenton Way	1987	28 June	Amended to Shenton Way Ter.
		1989	23 July	Serves new pair of bus stops near Pioneer Rd along Tuas Rd.
	Bukit Batok ↺ Tuas Rd		6 November	Shortened to start from Bt Batok Int and loop at Tuas Rd.
	Bukit Batok ↺ Jurong West St 91	1990	7 July	Shortened to loop at Jurong West St 91, skipping Tuas Rd.
		1991	20 January	Discontinued under TransitLink Network Integration Exercise Phase 2.

2^nd Generation (1993 - 2005)

Operator	Route	Year	Date	Service changes
	Lim Chu Kang ↺ Upp Bt Timah Rd	1993	18 July	Introduced between Lim Chu Kang Ter and Upp Bt Timah Rd (Loop).
		1994	TBC	Amended to ply Sg Tengah Rd with the partial closure of Choa Chu Kang Rd.
		1997	TBC	Serves new bus stop outside Lot 1 Shoppers' Mall along Choa Chu Kang Ave 4.
		1998	TBC	Serves new pair of bus stops outside and opposite Blk 464 along Choa Chu Kang Ave 3.
		1999	26 December	Operations transferred to TIBS.
		2001	TBC	Serves new bus stop outside Sunshine Pl along Choa Chu Kang Ave 3.
	Bt Panjang ↺ Lim Chu Kang Rd	2005	27 February	Amended to start from Bt Panjang Int, loop at Lim Chu Kang Rd and re-numbered Service 975, skipping Choa Chu Kang Int and Upp Bt Timah Rd.

3^rd Generation (since 2007)

Operator	Route	Year	Date	Service changes
(Current)	Clementi ↔ Lor 1 Geylang	2007	11 March	Introduced between Clementi Temp Int and Lor 1 Geylang Ter, operating between 0600 hrs and 2330 hrs from Clementi Temp Int and Lor 1 Geylang Ter daily.
			24 June	Serves new bus stop outside Blk 114 along Depot Rd.
		2011	26 November	Amended to Clementi Integrated Transport Hub.
			3 December	Designated wheelchair-accessible bus service (WAB).
		2013	10 March	Serves new bus stop after West Coast Highway along West Coast Lk.
		2024	24 November	Serves new bus stop before West Coast Crescent along West Coast Lk.

Service 175A

Operator	Route	Year	Date	Service changes
	Upp Jurong Rd ↺ Tuas Village	1980	2 January	Introduced between Upp Jurong Rd Ter and Tuas Village (Loop).
		1983	30 October	Discontinued.

Service 176

1^st Generation (1971 - 1983)

Operator	Route	Year	Date	Service changes
United Bus Company	Corporation Dr ↔ Prince Edward	1971	11 April	Introduced between Corporation Dr Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Corporation Dr ↔ Crawford St	1974	3 February	Extended to Crawford St Ter under 1974 Bus Rationalisation.
			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.
	Boon Lay Gardens ↔ Crawford St	1977	28 March	Extended to Boon Lay Gdns Ter.
		1978	15 January	Amended to ply Jln Sultan and Beach Rd.
	Clementi ↔ Crawford St		1 June	Shortened to Clementi Ter with the opening of Jurong Int.
		1979	11 February	Amended to ply the extended Shenton Way towards Clementi Ter, skipping Parsi Rd and Anson Rd.
	Clementi ↺ Empress Pl		25 November	Shortened to loop at Empress Pl from Clementi Ter.
		1980	16 November	Amended to Clementi Int.
		1981	21 June	Amended to skip Nepal Circus towards Empress Pl.
			11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1983	26 December	Integrated with Service 146 and discontinued.

2^nd Generation (since 1988)

Operator	Route	Year	Date	Service changes
	Jurong East ↺ Bukit Panjang	1988	24 January	Introduced between Jurong East Int and Bt Panjang Ter (Loop).
		1989	16 January	Last bus from Jurong East Int extended to 2345 hrs daily.
			5 March	Amended to ply Bt Batok West Ave 6 and Bt Batok West Ave 3.
				Amended to ply Upp Bt Timah Rd and Bt Panjang Rd, skipping Cashew Rd.
	Bukit Panjang ↔ Bukit Merah	1990	1 July	Integrated with Service 184, amended to start from Bt Panjang Ter and extended to Bt Merah Int.
		1995	30 April	Amended to ply Bt Batok East Ave 2, skipping Bt Batok East Ave 4.
(Current) Known as prior to 10 May 2004			1 October	Operations transferred to Trans Island Bus Services.
		1998	TBC	First bus from Bt Panjang Ter brought forward to 0545 hrs on Sundays and Public Holidays.
		1999	26 December	Amended to Bt Panjang Int.
		2002	TBC	Skips removed bus stop opposite ITE Pasir Panjang along Telok Blangah Rd.
		2005	TBC	Serves new bus stop outside Hillington Green Condo along Hillview Ave, skipping the bus stop outside Hillview Hts.
		2006	TBC	Last bus from Bt Panjang Int brought forward to 2330 hrs daily.
		2010	23 May	Skips temporarily closed bus stop outside Assumption Voc Inst along Upp Bt Timah Rd to facilitate the construction of Cashew station along the Downtown Line.
		2012	16 December	Amended to start from and terminate at Jelebu Rd with the opening of Bt Panjang Temp Bus Pk and the closure of Bt Panjang Int.
		2015	1 March	Serves reinstated bus stop outside Assumption Pathway Sch along Upp Bt Timah Rd.
			22 March	Designated wheelchair-accessible bus service (WAB).
			27 December	Serves additional bus stop outside Hillview Stn along Upp Bt Timah Rd.
		2017	4 September	Amended to Bt Panjang Integrated Transport Hub.
				Last bus from Bt Panjang Int extended to 2335 hrs daily.

Service 177

1^st Generation (1978 - 1988)

Operator	Route	Year	Date	Service changes
	Bt Timah ↺ Choa Chu Kang Rd	1978	27 November	Introduced between Bt Timah Ter and Choa Chu Kang Rd End (Loop).
		1979	30 December	Amended to ply Jln Anak Bt towards Bt Timah Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1987	19 April	Serves new staggered bus stop under the PIE Flyover along Jln Anak Bt, skipping the bus stop opposite Bt Timah Plaza.
		1988	31 July	Discontinued.

2^nd Generation (since 1989)

Operator	Route	Year	Date	Service changes
	MINDEF Car Pk ↺ Hillview Rd	1989	26 April	Introduced between MINDEF Car Pk and Hillview Rd (Loop) as a peak hour service on weekdays and Saturdays only.
			10 July	Morning peak trips revised to operate between 0700 and 0800 hrs.
	Bukit Batok ↺ Bukit Panjang	1990	12 March	Extended to start from Bt Batok Int and extended to loop at Bt Panjang Ter.
			16 July	Morning peak trips from Bt Batok Int revised to operate between 0700 and 0800 hrs. Evening peak trips from Bt Batok Int revised to operate between 1615 and 1715 hrs on weekdays, and between 1200 and 1300 hrs on Saturdays.
			17 December	Evening peak trips from Bt Batok Int revised to operate between 1215 and 1315 hrs on Saturdays. Evening peak trips from Bt Panjang Ter revised to operate between 1225 and 1310 hrs on Saturdays.
Known as prior to 10 May 2004		1995	2 July	Operations transferred to Trans Island Bus Services.
	Bukit Batok ↔ Bukit Panjang	1999	26 December	Amended to Bt Panjang Int.
		2004	25 September	Revised to operate on weekdays only.
		2005	TBC	Serves new bus stop outside Hillington Green Condo along Hillview Ave, skipping the bus stop outside Hillview Hts.
		2008	TBC	Last bus (PM peak) from Bt Panjang Int revised to 1830 hrs.
			TBC	Last bus (PM peak) from Bt Batok Int revised to 1820 hrs.
		2012	1 July	Designated wheelchair-accessible bus service (WAB).
	Bukit Batok ↺ Jelebu Rd		16 December	Amended to loop at Jelebu Rd with the closure of Bt Panjang Int.
	177Bukit Batok ↺ Jelebu Rd 177ABukit Batok → Jelebu Rd		17 December	177AIntroduced from Bt Batok Int to Jelebu Rd (Bt Panjang Plaza), operating after the last bus of Service 177 during peak hours on weekdays. Wheelchair-accessible bus service (WAB) at launch.
(Current)	Bukit Batok ↺ Jelebu Rd	2016	29 May	Operations transferred to Tower Transit Singapore.
				177ADiscontinued with the commencement of the Bulim Bus Package.
			13 June	First bus revised to 0550 hrs (AM Peak) and 1620 hrs (PM Peak) on weekdays.
		2017	4 September	Serves the bus stop outside Blk 180 along Jelebu Rd, skipping the bus stop outside Bt Panjang Plaza.
		2020	23 November	Amended to ply non-stop along Hillview Rd and Upp Bt Timah Rd with the closure of Hillview Lk to facilitate the construction of NS Hub.
		2024	26 August	Amended to ply non-stop along Hillview Rise in both directions with the partial closure of Hillview Ave, serving the bus stop opposite Glendale Pk Condo along Hillview Ave (towards Bukit Batok) temporarily to facilitate the construction of the new CMPB along Hillview Ave.
		2025	28 April	Amended to ply reinstated Hillview Lk and Hillview Ave, skipping Hillview Rd and Upp Bt Timah Rd.

Service 178

Operator	Route	Year	Date	Service changes
	Corporation Dr ↔ Upp Bt Timah Rd	1974	3 February	Introduced between Corporation Dr Ter and Upp Bt Timah Rd Ter under 1974 Bus Rationalisation.
		1975	9 November	Amended to realigned Jurong Rd, skipping Old Jurong Rd.
	Boon Lay Gardens ↔ Upp Bt Timah Rd	1977	28 March	Extended to Boon Lay Gdns Ter.
	Jurong ↔ Upp Bt Timah Rd	1978	1 June	Amended to Jurong Int and amended to ply Jurong Rd, skipping Jln Jurong Kechil.
	Jurong ↔ Woodlands Ctr	1980	14 December	Extended to Woodlands Town Ter.
		1981	29 November	Amended to Woodlands Int.
(Current) Known as prior to 10 May 2004	Woodlands Ctr ↔ Jurong	1983	10 July	Operations transferred to Trans Island Bus Services.
		1984	20 October	Amended to ply Bt Batok East Ave 3, Bt Batok St 24, Bt Batok St 23 and interim road with the partial closure of Jurong Rd (between Bt Batok East Ave 3 and Bt Batok St 23).
		1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok East Ave 3 with the partial closure of Jurong Rd.
		1986	6 July	Serves new pair of bus stops outside and opposite Bt Batok Sec Sch along Bt Batok East Ave 6.
	Woodlands Ctr ↔ Boon Lay	1990	1 July	Amended to Boon Lay Int.
	Woodlands ↔ Boon Lay	1996	4 February	Extended to Woodlands Reg Int.
			TBC	Skips a pair of removed bus stops outside and opposite MOE Water Works along Jln Ahmad Ibrahim.
		1999	19 July	Serves new bus stop outside Woodlands CIQ along Woodlands Rd.
		2003	TBC	Serves new pair of bus stops outside and opposite Assyakirin Mque along Corporation Rd.
		2006	TBC	Last bus from Woodlands Reg Int brought forward to 2330 hrs daily.
			TBC	Last bus from Boon Lay Int brought forward to 2330 hrs daily.
			18 June	Amended to Boon Lay Temp Int.
		2009	27 December	Amended to Boon Lay Integrated Transport Hub.
		2010	23 May	Skips temporarily closed bus stop outside Assumption Voc Inst along Upp Bt Timah Rd to facilitate the construction of Cashew station along the Downtown Line.
		2011	23 October	Serves new bus stop outside Intl Business Pk along Jurong Town Hall Rd.
	178Woodlands ↔ Boon Lay 178AWoodlands → Woodlands Rd	2013	15 July	178AIntroduced from Woodlands Reg Int to Woodlands Rd (Kranji Stn) during morning peak hours on weekdays.
			29 September	Designated wheelchair-accessible bus service (WAB).
		2015	1 March	Serves reinstated bus stop outside Assumption Pathway Sch along Upp Bt Timah Rd.
		2016	12 March	Amended to Woodlands Temp Int.
			11 December	Serves new bus stop opposite Blk 635A along Woodlands Rd.
		2017	23 April	Serves relocated bus stop before PIE along Bt Batok Rd.
			28 May	Skips removed bus stop opposite Mandai Rd along Woodlands Rd.
		2018	25 March	Amended to ply Woodlands Ave 3 and Woodlands Ctr Rd towards Woodlands Temp Int.
			10 June	Serves new bus stop before Yew Tee Flyover along Woodlands Rd.
		2021	13 June	Amended to Woodlands Integrated Transport Hub.

Service 179

1^st Generation (1974 - 1983)

Operator	Route	Year	Date	Service changes
	Lim Chu Kang ↔ Bt Timah	1974	3 February	Introduced between Lim Chu Kang Ter and Bt Timah Ter under 1974 Bus Rationalisation.
		1978	27 November	Amended to skip Choa Chu Kang Rd End with the introduction of Service 177.
		1979	30 December	Amended to ply Jln Anak Bt towards Bt Timah Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1983	27 November	Discontinued.

2^nd Generation (1985 - 1990)

Operator	Route	Year	Date	Service changes
	Bukit Batok ↔ New Bridge Rd	1985	18 August	Introduced between Bt Batok Ter and New Bridge Rd Ter.
		1987	6 June	Amended to the relocated New Bridge Rd Ter.
			27 September	Amended to Bt Batok Int.
				Amended to ply the extended Eu Tong Sen St towards Bt Batok Int to facilitate the first stage of road expansion along New Bridge Rd.
			1 November	Amended to ply Eu Tong Sen St towards Bt Batok 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.
	Choa Chu Kang ↔ New Bridge Rd		18 December	Extended to Choa Chu Kang Ter and amended to ply Scotts Rd and Orchard Rd.
		1990	7 January	Serves new pair of bus stops outside and opposite Bt Batok Driving Ctr along Bt Batok West Ave 5.
			10 March	Extended to interim terminal along Choa Chu Kang Ave 4.
			8 April	Amended to Choa Chu Kang Int.
			16 December	Integrated with Service 190 and discontinued.

3^rd Generation (1993 - 1999)

Operator	Route	Year	Date	Service changes
	Choa Chu Kang Int ↺ Fajar Rd	1993	3 January	Introduced between Choa Chu Kang Int and Fajar Rd (Loop) under TransitLink Network Integration Exercise Phase 11.
		1995	2 July	Operations transferred to TIBS.
		1999	26 December	Discontinued under Bukit Panjang LRT Rationalisation.

4^th Generation (since 2001)

Operator	Route	Year	Date	Service changes
Known as prior to 1 November 2001	Boon Lay ↺ Nanyang Dr	2001	7 January	Introduced between Boon Lay Int and Nanyang Dr (Loop).
		2006	18 June	Amended to Boon Lay Temp Int.
		2010	8 May	Amended to Boon Lay Integrated Transport Hub.
		2014	7 December	Serves new bus stop opposite Blk 41 along Nanyang Dr.
		2015	3 December	Designated wheelchair-accessible bus service (WAB).
(Current)		2024	1 September	Operations transferred to SMRT Buses.

Service 179A

Operator	Route	Year	Date	Service changes
	AMBoon Lay ↺ Nanyang Dr PMLien Ying Chow Dr → Boon Lay	2007	1 October	Introduced from Boon Lay Temp Int to Nanyang Dr (Hall 4) during morning peak hours and from Nanyang Dr (Hall 1) to Boon Lay Temp Int during evening peak hours on weekdays, plying express sectors along Jurong West St 63 and Pioneer Rd Nth.
		2010	8 May	Amended to Boon Lay Integrated Transport Hub.
		2014	7 December	Serves new bus stop opposite Blk 41 along Nanyang Dr.
(Current)		2024	1 September	Operations transferred to SMRT Buses.
	Boon Lay ↺ Nanyang Dr	2025	4 August	Evening trips shortened to terminate at Jurong West Street 63 (Pioneer Stn Exit B) and renumbered to Service 179B.

Service 179B

Operator	Route	Year	Date	Service changes
(Current)	Lien Ying Chow Dr → Jurong West Street 63	2025	4 August	Renumbered from Service 179A evening trips as a service from Lien Ying Chow Dr (Hall 1) to Jurong West Street 63 (Pioneer Stn Exit B) during evening peak hours on weekdays, plying express sectors along Pioneer Rd Nth.