History of Services 171 - 180

Service 171

Refer to Bus Service 171 for more details.

Service 172

Refer to Bus Service 172 for more details.

Service 173

Refer to Bus Service 173 for more details.

Service 174 / Short Trip 174A (2010)

Refer to Bus Service 174 for more details.

Service 175 (1971 - 1991)

Operator	Route	Year	Date	Service changes
UBC	Upp Jurong Rd ↔ Prince Edward (1971 - 1983)	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 - 1987)	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 - 1989)	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 (1989 - 1990)		6 November	Shortened to start from Bt Batok Int and loop at Tuas Rd.
	Bukit Batok ↺ Jurong West St 91 (1990 - 1991)	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.

Service 175 (1993 - 2005)

Operator	Year	Date	Service changes
	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.
	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.

Service 175 (since 2007)

Refer to Bus Service 175 for more details.

Service 175A (1980 - 1983)

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

Service 176 (1971 - 1983)

Operator	Route	Year	Date	Service changes
UBC	Corporation Dr ↔ Prince Edward (1971 - 1974)	1971	11 April	Introduced between Corporation Dr Ter and Prince Edward Ter under 1971 Bus Reorganisation.
	Corporation Dr ↔ Crawford St (1974 - 1977)	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 - 1978)	1977	28 March	Extended to Boon Lay Gdns Ter.
		1978	15 January	Amended to ply Jln Sultan and Beach Rd.
	Clementi ↔ Crawford St (1978 - 1979)		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 (1979 - 1983)		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.

Service 176 (since 1988)

Refer to Bus Service 176 for more details.

Service 177 (1978 - 1988)

Operator	Year	Date	Service changes
	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.

Service 177 (since 1989) / Short Trip 177A (2012 - 2016)

Refer to Bus Service 177 for more details.

Service 178 / Short Trip 178A

Refer to Bus Service 178 for more details.

Service 179 (1974 - 1983)

Operator	Year	Date	Service changes
	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.

Service 179 (1985 - 1990)

Operator	Route	Year	Date	Service changes
	Bukit Batok ↔ New Bridge Rd (1985 - 1988)	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 (1988 - 1990)		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.

Service 179 (1993 - 1999)

Operator	Year	Date	Service changes
	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.

Service 179 (since 2001)

Operator	Route	Year	Date	Service changes
	Boon Lay ↺ Nanyang Dr (2001 - 2006)	2001	7 January	Introduced between Boon Lay Int and Nanyang Dr (Loop).
	Boon Lay Temp Int ↺ Nanyang Dr (2006 - 2010)	2006	18 June	Amended to Boon Lay Temp Int.
	Boon Lay ↺ Nanyang Dr (since 2010)	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
	Boon Lay Temp Int → Nanyang Dr (AM) Nanyang Dr → Boon Lay Temp Int (PM) (2007 - 2010)	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.
	Boon Lay → Nanyang Dr (AM) Boon Lay → Nanyang Dr → Boon Lay (PM) (since 2010)	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 180 (April - May 1971)

Operator	Year	Date	Service changes
UBC	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.

Service 180 (1974 - 1991)

Operator	Route	Year	Date	Service changes
	Upp Bt Timah Rd ↔ Tg Pagar Rd (1974 - 1976)	1974	3 February	Re-numbered from Service 180/180A as a service between Upp Bt Timah Rd Ter and Tg Pagar Ter under 1974 Bus Rationalisation.
			8 December	Amended to ply Cecil St, skipping Robinson Rd.
		1975	19 July	Amended to ply Coleman St and Hill St, skipping Stamford Rd.
	Marsiling ↔ Tg Pagar Rd (1976 - 1979)	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.
	Marsiling ↔ Anson Rd (1979 - 1985)		1 August	Amended to Anson Rd Ter.
			25 November	Amended to ply Pickering St and Church St, skipping Nth Canal Rd and Market St.
			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.
	Marsiling ↔ World Trade Ctr (1985 - 1991)	1985	13 January	Extended to World Trade Ctr Ter.
		1990	19 August	Amended to ply Bt Timah Rd, Sungei Rd, Bencoolen St, Orchard Rd, Penang Rd and Clemenceau Ave (towards World Trade Ctr Ter) / Orchard Rd, Dhoby Ghaut, Selegie Rd and Bt Timah Rd due to the partial closure of Clemenceau Ave to facilitate Phase 2 of the construction of CTE.
		1991	6 January	Discontinued under TransitLink Network Integration Exercise Phase 1.

Service 180/180A (1971 - 1974)

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 (1971 - 1974)

Operator	Year	Date	Service changes
UBC	1971	11 April	Introduced between Bt Timah Ter and Stamford Rd (Loop) under 1971 Bus Reorganisation.
		9 May	Integrated with Service 180 and discontinued.

Service 180 (since 1996) / Short Trip 180A

Refer to Bus Service 180 for more details.