SMRT Bus Service 172

SMRT Bus Service 172 is a trunk route linking Choa Chu Kang Interchange and Boon Lay Interchange, passing through Choa Chu Kang Ave 1, Brickland Road, Old Choa Chu Kang Road, Jalan Bahar and Jalan Boon Lay.

Service 172 plies the realigned Jalan Bahar from 8 Jun 2025, skipping a pair of closed bus stops along Jalan Bahar.

Route Overview
Route	Choa Chu Kang Bus Interchange ↔ Boon Lay Bus Interchange
Passes Through	Choa Chu Kang Ave 1, Choa Chu Kang Ave 3, Old Choa Chu Kang Rd, Jln Bahar, Jln Boon Lay
Route Length	Towards Boon Lay: 14.7 km						Towards Choa Chu Kang: 13.5 km
Travelling Time	50 mins
Operator Information
BCM Route Package	Choa Chu Kang–Bukit Panjang Bus Package
Current Operator	SMRT Buses Ltd
Current Depot	Kranji Bus Depot (KJDEP) Buses park at: Soon Lee Bus Depot
Current Fleet	Single-deck & Double-deck buses
Operating Hours
Departure Times from Choa Chu Kang	Weekdays & Saturdays								Sundays / Public Holidays
	05:30 – 23:30								06:00 – 23:30
Departure Times from Boon Lay	Weekdays & Saturdays								Sundays / Public Holidays
	05:30 – 23:30								06:00 – 23:30
Operating Frequency
Weekdays	6:30am–8.30am			8.31am–4.59pm			5.00pm–7.00pm			After 7.00pm
From Choa Chu Kang	5 – 9 mins			7 – 13 mins			6 – 9 mins			8 – 14 mins
From Boon Lay	5 – 9 mins			5 – 13 mins			7 – 10 mins			10 – 13 mins
Fare Information
Fare	Charges regular distance fares

Service 172 is an inter-town route providing bus connections between Choa Chu Kang and Boon Lay towns. The route travels through suburban areas along along Jalan Bahar and Old Choa Chu Kang Road, while also linking residents of Choa Chu Kang Avenue 1 to Choa Chu Kang Int/MRT.

Due to demand from various defence institutions along Jln Bahar, Old Choa Chu Kang and increased inter-town passenger demand between Choa Chu Kang & Boon Lay during peak hours, this service operates a relatively large number of split-shift buses, including the addition of high capacity articulated and double deck buses. Double deck buses made their appearance from 14th July 2015 onwards.

MRT / LRT Stations Served

• NS4BP1 Choa Chu Kang
• EW27 Boon Lay

Special Departures

• Choa Chu Kang Ave 1 (Choa Chu Kang Mkt) → Choa Chu Kang Int
  Weekdays: 07:00, 07:15 & 07:30

Gallery

Poster Gallery

Operator History

• 1971 – 1973: United Bus Company Pte Ltd
• 1973 – 1999: Singapore Bus Services Ltd
• 1999 –  2004: Trans-Island Bus Services Ltd
• 2004 – Present: SMRT Buses Ltd

Route History

• 1971 (11 Apr): Introduced between Lim Chu Kang Ter and Prince Edward Ter under 1971 Bus Reorganisation
• 1973 (01 Nov): Operated by Singapore Bus Service (SBS)
• 1974 (03 Feb): Amended to skip Choa Chu Kang Rd End under 1974 Bus Rationalisation
• 1974 (08 Dec): Amended to ply Cecil St, skipping Robinson Rd
• 1976 (14 Mar): Serves new staggered bus stop outside The Cenotaph along Connaught Dr, skipping the bus stop opposite Singapore Cricket Club
• 1979 (11 Feb): Amended to ply the extended Shenton Way, Palmer Rd and Anson Rd, skipping Parsi Rd
• 1979 (28 Oct): Amended to ply Sungei Rd towards Prince Edward Ter with the conversion of Rochor Canal Rd to one-way traffic
• 1979 (30 Dec): Amended to ply Jln Anak Bt towards Prince Edward Ter with the partial conversion of Upp Bt Timah Rd to one-way traffic
• 1980: Amended to ply Bt Timah Rd towards Lim Chu Kang Ter, skipping Mackenzie Rd
• 1987 (28 Jun): 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 (03 Jan): Amended to Boon Lay Int under TransitLink Network Integration Exercise Phase 11
• 1994: Amended to ply Sungei Tengah Rd with the partial closure of Choa Chu Kang Rd
• 1998: Serves new pair of bus stops outside and opposite Blk 464 along Choa Chu Kang Ave 3
• 1999 (26 Dec): Operations transferred to Trans-Island Bus Services (TIBS); Shortened to Choa Chu Kang Int under Bukit Panjang LRT Rationalisation
• 2001: Serves new bus stop outside Sunshine Pl along Choa Chu Kang Ave 3
• 2006 (18 Jun): Amended to Boon Lay Temp Int
• 2009 (01 Jun): Designated wheelchair-accessible bus service (WAB)
• 2009 (27 Dec): Amended to Boon Lay Integrated Transport Hub
• 2011 (23 Oct): 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 Feb): Serves new bus stop outside Blk 293 along Choa Chu Kang Ave 1
• 2018 (16 Dec): Amended to the relocated Choa Chu Kang Bus Interchange
• 2019 (13 May): Additional halfway trips added during weekday morning peak hours from Bef Choa Chu Kang Mkt along Choa Chu Kang Ave 1 towards Choa Chu Kang Int
• 2025 (08 Jun): Amended to the realigned Jln Bahar, skipping a pair of closed bus stops outside and opposite Jln Bahar Power Stn & serve relocated bus stop before Nanyang Ave along Jln Bahar

Past Routings

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