History of Services 171 - 180

Service 171

Operator	Year	Date	Service changes
UBC	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.
	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/North 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.
	1987	18 January	Amended to Yishun Central 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	TBC	Amended to ply Orchard Link, skipping Grange Rd.
	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	TBC	Amended to ply Orchard Turn.
		5 November	Operations transferred to TIBS.
	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	7 July	Serves the bus stop outside Blk 923 along Yishun Ave 2, skipping the bus stop outside Northpoint Shop Ctr.
			Skips the bus stop outside Orchard Emerald along Orchard Rd.
	2003	24 August	Serves the bus stop outside Northpoint Shop Ctr along Yishun Ave 2, skipping the bus stop outside Blk 923.
Template:SMRT Buses (Current)	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.
	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 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.
		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.
2020	16 August	To be cutback to loop at Bukit Panjang Rd.

Service 172

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Lim Chu Kang Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	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	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.
	1987	28 June	Amended to Shenton Way Ter.
	1991	26 May	Shortened to loop at Jln Anak Bt from Lim Chu Kang Ter under TransitLink Network Integration Exercise Phase 5.
	1993	3 January	Amended to Boon Lay Int under TransitLink Network Integration Exercise Phase 11.
	1994	TBC	Amended to ply Sungei 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.
	1999	26 December	Operations transferred to TIBS.
			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.
Template:SMRT Buses (Current)	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 abolished bus stops after LP 222 and B27 Old Choa Chu Kang Rd along Old Choa Chu Kang Rd.
	2013	25 February	Serves new bus stop outside Blk 293 along Choa Chu Kang Ave 1.
	2018	16 December	Amended to new Choa Chu Kang Int.

Service 173

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Princess Elizabeth Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
	1974	24 February	Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way traffic, skipping Orchard Rd.
	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 abolished bus stop opposite Jamae Mosque.
	1990	10 March	Extended to start from Bt Batok Int and shortened to loop at Jln Anak Bt.
	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 Central and Bt Batok St 21 under TransitLink Network Integration Exercise Phase 7, skipping Bt Batok East Ave 3.
	1993	5 December	Converted to loop service between Bt Batok Int and Clementi Int.
	2000	24 December	Operations transferred to TIBS.
	2003	12 October	Serves the bus stop opposite Bt Timah Plaza along Jln Anak Bt with the abolition of the bus stop under the PIE Flyover.
Template:SMRT Buses	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.
	2011	26 November	Amended to loop at Clementi Integrated Transport Hub.
	2013	21 April	Designated wheelchair-accessible bus service (WAB).
	2015	27 December	Amended to ply the upgraded Upp Bt Timah Rd towards Clementi Integrated Transport Hub, skipping Jln Anak Bt.
Template:Tower Transit Singapore (Current)	2016	29 May	Operations transferred to Tower Transit Singapore.

Service 173A

Operator	Service Gen	Year	Date	Service changes
	1st Gen (2000 - 2007)	2000	TBC	Introduced as a short-trip service from Jln Anak Bt (PIE Flyover) to Jln Jurong Kechil (Bef Upp Bt Timah Rd) during morning peak hours on weekdays.
		2003	12 October	Amended to start from Jln Anak Bt (Opp Bt Timah Plaza) with the abolition of the bus stop under the PIE Flyover.
Template:SMRT Buses		2006	29 October	Amended to loop at Clementi Temp Int.
		2007	TBC	Withdrawn.
	2nd Gen (Since 2007)		5 November	Re-introduced as a short-trip service from Bt Batok Int to Bt Batok East Ave 4 (Blk 254), operating after the last bus of Service 173 daily.
		2013	21 April	Designated wheelchair-accessible bus service (WAB).
Template:Tower Transit Singapore (Current)		2016	29 May	Operations transferred to Tower Transit Singapore.

Service 174

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Nanyang University Ter and New Bridge Rd Ter under 1971 Bus Reorganisation.
	1974	24 February	Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way traffic, skipping Orchard Rd.
	1975	TBC	Amended to ply Farrer Rd, Holland Rd and Napier Rd, skipping Stevens Rd and Scotts Rd.
	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.
	1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Central and Bt Batok East Ave 3 with the partial closure of Jurong Rd.
	1986	23 March	Amended to ply Jln Bahar, skipping Upp Jurong Rd.
	1987	22 February	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 Walk, skipping Nanyang Ave.
	1991	20 January	Amended to ply Nanyang Dr, skipping Nanyang Cres.
		7 April	Shortened to Boon Lay Int under TransitLink Network Integration Exercise Phase 3.
	1992	TBC	Amended to ply Orchard Link, skipping Grange Rd.
	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 MRT station on the North East MRT Line.
	2000	TBC	Serves additional bus stop opposite Blk 333 along Kreta Ayer Rd.
Template:SBS Transit (Current)	2002	20 April	Amended to ply Upp Cross St and the reinstated New Bridge Rd, skipping South 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 abolished 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.
	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 Link with the partial closure of Jln Jurong Kechil to facilitate the construction of Beauty World MRT station on the Downtown MRT Line.
	2014	26 January	Amended to ply the reinstated Jln Jurong Kechil, skipping Upp Bt Timah Rd and Bt Timah Link.
	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.
	2018	10 March	Extended to Kg Bahru Ter with the closure of New Bridge Rd Ter.

Service 174A

Operator	Year	Date	Service changes
Template:SBS Transit	2010	18 September	Introduced as a temporary short-trip service from Boon Lay Integrated Transport Hub to Bt Batok Central (Opp Blk 628) during the closure of MRT stations for the Jurong East Modification Project (JEMP). Wheelchair-accessible at launch.
		20 September	Withdrawn.

Service 175

Operator	Service Gen	Year	Date	Service changes
UBC	1st Gen (1971 - 1991)	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.
		1979	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	1 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.
		1983	TBC	Amended to Pioneer Rd Ter.
		1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Central and Bt Batok East Ave 3 with the partial closure of Jurong Rd.
		1987	28 June	Amended to Shenton Way Ter.
		1989	23 July	Serves new pair of bus stops near Pioneer Rd along Tuas Rd.
			6 November	Shortened to start from Bt Batok Int and loop at Tuas Rd.
		1990	7 July	Shortened to loop at Jurong West St 91, skipping Tuas Rd.
		1991	20 January	Withdrawn under TransitLink Network Integration Exercise Phase 2.
	2nd Gen (1993 - 2005)	1993	18 July	Re-introduced between Lim Chu Kang Ter and Upp Bt Timah Rd (Loop).
		1994	TBC	Amended to ply Sungei 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.
Template:SMRT Buses		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.
Template:SBS Transit (Current)	3rd Gen (Since 2007)	2007	11 March	Re-introduced between Clementi Temp Int and Lor 1 Geylang Ter.
			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 Link.

Service 175A

Operator	Year	Date	Service changes
	1980	1 January	Introduced between Upp Jurong Rd Ter and Tuas Village (Loop).
	1982	TBC	Withdrawn.

Service 176

Operator	Service Gen	Year	Date	Service changes
UBC	1st Gen (1971 - 1983)	1971	11 April	Introduced between Corporation Dr Ter and Prince Edward Ter under 1971 Bus Reorganisation.
		1974	3 February	Extended to Crawford St Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply the extended Robinson Rd, skipping Market St.
		1975	21 July	Extended to Boon Lay Gardens Ter.
		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.
		1978	15 January	Amended to ply Jln Sultan and Beach Rd.
			1 June	Shortened to Clementi Ave 3 Ter with the opening of Jurong Int.
		1979	11 February	Amended to ply the extended Shenton Way towards Clementi Ave 3 Ter, skipping Parsi Rd and Anson Rd.
		1980	TBC	Shortened to loop at Empress Place.
			16 November	Amended to Clementi Int.
		1981	11 October	Serves new staggered bus stop outside Tunas Bldg along Anson Rd, skipping the bus stop outside Intl Plaza.
		1983	18 December	Integrated with Service 146 and withdrawn.
	2nd Gen (Since 1988)	1988	24 January	Re-introduced between Jurong East Int and Bt Panjang Ter (Loop).
		1989	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.
		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.
			1 October	Operations transferred to TIBS.
		1999	26 December	Amended to Bt Panjang Int.
		2002	TBC	Skips abolished bus stop opposite ITE Pasir Panjang along Telok Blangah Rd.
Template:SMRT Buses (Current)		2005	TBC	Serves new bus stop outside Hillington Green Condo along Hillview Ave, skipping the bus stop outside Hillview Heights.
		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.
		2012	16 December	Amended to start from and terminate at Jelebu Rd with 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 Bukit Panjang Integrated Transport Hub.

Service 177

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1978 - 1988)	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	20 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	Withdrawn.
	2nd Gen (Since 1989)	1989	26 April	Re-introduced between MINDEF Car Park and Hillview Rd (Loop) as a peak hour service on weekdays and Saturdays only.
		1990	10 March	Extended to start from Bt Batok Int and extended to loop at Bt Panjang Ter.
		1995	2 July	Operations transferred to TIBS.
		1999	26 December	Amended to Bt Panjang Int.
Template:SMRT Buses		2005	TBC	Serves new bus stop outside Hillington Green Condo along Hillview Ave, skipping the bus stop outside Hillview Heights.
		2012	1 July	Designated wheelchair-accessible bus service (WAB).
			16 December	Amended to loop at Petir Rd with the closure of Bt Panjang Int.
Template:Tower Transit Singapore (Current)		2016	29 May	Operations transferred to Tower Transit Singapore.
		2017	4 September	Serves the bus stop outside Blk 180 along Jelebu Rd, skipping the bus stop outside Bt Panjang Plaza.

Service 177A

Operator	Year	Date	Service changes
Template:SMRT Buses	2012	16 December	Introduced as a short-trip service from Bt Batok Int to Jelebu Rd (Bt Panjang Plaza) during peak hours on weekdays. Wheelchair-accessible at launch.
	2016	29 May	Withdrawn.

Service 178

Operator	Year	Date	Service changes
	1974	3 February	Introduced between Corporation Dr Ter and Upp Bt Timah Rd Ter under 1974 Bus Rationalisation.
	1975	21 July	Extended to Boon Lay Gardens Ter.
	1978	1 June	Amended to Jurong Int and amended to ply Jurong Rd, skipping Jln Jurong Kechil.
	1980	14 December	Extended to Admiralty Rd Ter.
	1981	29 November	Amended to Woodlands Int.
	1983	10 July	Operations transferred to TIBS.
	1985	17 March	Amended to ply Bt Batok Rd, Bt Batok West Ave 3, Bt Batok Central 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.
	1990	1 July	Amended to Boon Lay Int.
	1996	4 February	Extended to Woodlands Reg Int.
		TBC	Skips a pair of abolished bus stops outside and opposite MOE Water Works along Jln Ahmad Ibrahim.
	2003	TBC	Serves new pair of bus stops outside and opposite Assyakirin Mosque along Corporation Rd.
Template:SMRT Buses (Current)	2006	18 June	Amended to Boon Lay Temp Int.
	2009	27 December	Amended to Boon Lay Integrated Transport Hub.
	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	23 October	Serves new bus stop outside International Business Pk along Jurong Town Hall Rd.
	2013	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 abolished bus stop opposite Mandai Rd along Woodlands Rd.
	2018	25 March	Amended to ply Woodlands Ave 3 and Woodlands Centre Rd towards Woodlands Temp Int.
		10 June	Serves new bus stop before Yew Tee Flyover along Woodlands Rd.

Service 178A

Operator	Year	Date	Service changes
Template:SMRT Buses (Current)	2013	15 July	Introduced as a short-trip service from Woodlands Reg Int to Woodlands Rd (Kranji Stn) during morning peak hours on weekdays.
		29 September	Designated wheelchair-accessible bus service (WAB).
	2016	12 March	Amended to Woodlands Temp Int.

Service 179

Operator	Service Gen	Year	Date	Service changes
	1st Gen (1974 - 1983)	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	Withdrawn.
	2nd Gen (1985 - 1990)	1985	18 August	Re-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 and 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.
			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 withdrawn.
	3rd Gen (1993 - 1999)	1993	3 January	Re-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	Withdrawn under Bukit Panjang LRT Rationalisation.
	4th Gen (Since 2001)	2001	7 January	Re-introduced between Boon Lay Int and Nanyang Dr (Loop).
Template:SBS Transit (Current)		2006	18 June	Amended to Boon Lay Temp Int.
		2010	8 May	Amended to Boon Lay Integrated Transport Hub.
			1 August	Temporarily amended to loop at Nanyang Ave due to road closures to facilitate the 2010 Youth Olympic Games (YOG).
			29 August	Resumed normal routing between Boon Lay Integrated Transport Hub and Nanyang Dr (Loop).
		2014	7 December	Serves new bus stop opposite Blk 41 along Nanyang Dr.
		2015	3 December	Designated wheelchair-accessible bus service (WAB).

Service 179A

Operator	Year	Date	Service changes
Template:SBS Transit (Current)	2007	1 October	Introduced as a short-trip service 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 North.
	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).

Service 180

Operator	Service Gen	Year	Date	Service changes
UBC	1st Gen (1971)	1971	11 April	Introduced between Bt Timah Ter and Prince Edward Ter under 1971 Bus Reorganisation.
			9 May	Integrated with Service 180A, amended to ply Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 180/180A.
	2nd Gen (1974 - 1991)	1974	3 February	Re-numbered from Service 180/180A as a service between Upp Bt Timah Rd Ter and Tg Pagar Rd Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1976	11 January	Extended to Admiralty Rd Ter.
		1979	11 February	Amended to ply the extended Shenton Way, Rambau St and Trafalgar St towards Tg Pagar Ter, skipping Parsi Rd.
			1 August	Amended to Anson Rd Ter.
			30 December	Amended to ply Jln Anak Bt towards Anson Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic.
		1983	7 August	Operations transferred to TIBS.
		1985	13 January	Extended to World Trade Ctr Ter.
		1991	6 January	Withdrawn under TransitLink Network Integration Exercise Phase 1.
	3rd Gen (Since 1996)	1996	10 March	Re-numbered from Service 951 as a service between Bt Panjang Ter and Boon Lay Int under Woodlands MRT Rationalisation.
		1999	26 December	Amended to Bt Panjang Int.
Template:SMRT Buses (Current)		2006	18 June	Amended to Boon Lay Temp Int.
		2009	27 December	Amended to Boon Lay Integrated Transport Hub.
		2012	16 December	Amended to loop at Petir Rd with the closure of Bt Panjang Int.
		2017	23 April	Serves relocated bus stop before PIE along Bt Batok Rd.
			16 July	Designated wheelchair-accessible bus service (WAB).
			4 September	Serves the bus stop outside Bt Panjang Stn along Upp Bt Timah Rd, skipping the abolished bus stop along Petir Rd.
		2018	25 February	Amended to loop at Bukit Panjang Integrated Transport Hub.

Service 180/180A

Operator	Year	Date	Service changes
UBC	1971	9 May	Re-numbered from Service 180 between Bt Timah Ter and Prince Edward Ter.
	1974	3 February	Extended to Upp Bt Timah Rd Ter, extended to Tg Pagar Ter, amended to skip Stamford Rd, Waterloo St and Bras Basah Rd and re-numbered Service 180 under 1974 Bus Rationalisation.

Service 180A

Operator	Service Gen	Year	Date	Service changes
UBC	1st Gen (1971)	1971	11 April	Introduced between Bt Timah Ter and Stamford Rd (Loop) under 1971 Bus Reorganisation.
			9 May	Integrated with Service 180 and withdrawn.
Template:SMRT Buses (Current)	2nd Gen (Since 2012)	2012	16 December	Re-introduced as a short-trip service from Boon Lay Integrated Transport Hub to Bt Panjang Rd (Blk 183) during evening peak hours on weekdays and after the last bus of Service 180 daily.
		2017	16 July	Designated wheelchair-accessible bus service (WAB).
			4 September	Serves the bus stop outside Bt Panjang Stn along Upp Bt Timah Rd, skipping the abolished bus stop along Petir Rd.
		2018	25 February	Amended to Bukit Panjang Integrated Transport Hub.