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.

^ SMRT Alexander Dennis Enviro500 (SMB5056S) – Service 172

Route Information
Route Choa Chu Kang Bus Interchange  Boon Lay Bus Interchange 
Passes Through CCK Ave 1, Brickland Road, Old CCK Road, Jln Bahar, Jln Boon Lay
Route Length 14.3km (D1) | 14.8km (D2)
Travelling Time 40 – 45 mins
Operator Information
Current Operator SMRT Buses
Current Depot Bulim Bus Depot (BUDEP)
Current Fleet 12-metre Double Deck Bus:
– Alexander Dennis Enviro500
18-metre Articulated Bus
– Mercedes-Benz O405G
12-metre Single Deck Bus
– Mercedes-Benz OC500LE
Departure Times from T1 0530 – 2330 (Weekdays, Saturdays)
0600 – 2330 (Sunday/PHs)
Departure Times from T2 0530 – 2330 (Weekdays, Saturdays)
0600 – 2330 (Sundays)
Frequency Direction 1 Direction 2
0630-0830: 05 – 08 mins
0831-1659: 06 – 13 mins
1700-1930: 07 – 08 mins
After 1930: 08 – 14 mins
0630-0830: 06 – 09 mins
0831-1659: 05 – 13 mins
1700-1930: 05 – 08 mins
After 1930: 07 – 14 mins

Route History

Service 172 is an inter-town route providing bus connections between Choa Chu Kang and Boon Lay towns, its direct routing being faster than the MRT. The route travels through suburban areas along along Jalan Bahar and Old Chua Chu Kang Road, whle 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.

Formerly a Singapore Bus Service (SBS) route since the 1970s, the route was transferred to Trans-Island Bus Service (TIBS) in 1996 and has been operated by SMRT ever since.

Fare: Charges fares for regular trunk services. See Bus Fares for exact fares.

Fleet: Service 172′s fleet comprises DAF SB220, Mercedes-Benz OC500LE, Mercedes-Benz O405G and Alexander Dennis Enviro500 buses.

Route Information:

Direction 1 Direction 2
  • Choa Chu Kang Int
  • Choa Chu Kang Ave 4
  • Choa Chu Kang Dr
  • Choa Chu Kang Ave 1
  • Choa Chu Kang Ave 3
  • Brickland Rd
  • Sg Tengah Rd
  • Old Choa Chu Kang Rd
  • Jln Bahar
  • Jln Boon Lay
  • Boon Lay Way
  • Jurong West St 64
  • Boon Lay Int
  • Boon Lay Int
  • Jurong West St 64
  • Boon Lay Way
  • Jln Boon Lay
  • Jln Bahar
  • Old Choa Chu Kang Rd
  • Sg Tengah Rd
  • Brickland Rd
  • Choa Chu Kang Ave 3
  • Choa Chu Kang Ave 1
  • Choa Chu Kang Dr
  • Choa Chu Kang Int

Operator History:

  • 1971 – 1973: United Bus Company Pte Ltd
  • 1973 – 1996: Singapore Bus Services Ltd
  • 1996 –  2004: Trans-Island Bus Services Ltd
  • 2004 – Present: SMRT Buses Ltd

The Bus Service Operating License (BSOL) for this route will be renewed in 2016.



  • 1971 (11 Apr): Introduced as Service 172, between Lim Chu Kang Rd (End) and Prince Edward
  • 1987 (28 Jun): Amended to Shenton Way Ter
  • 1993 (03 Jan): Shortened to loop at Jln Anak Bt and amended to Boon Lay Int due to MRT rationalisation
  • 1993 (18 Jul): Amended to ply Sungei Tengah Rd, Brickland Rd and Choa Chu Kang Ave 3, serving the new town of Choa Chu Kang.
  • 1999 (26 Dec): Handed to Trans-Island Bus Services (TIBS) and shortened to Choa Chu Kang Int.
  • 2006 (18 Jun):  Amended to Boon Lay Temp Int
  • 2009 (01 Jun): Designated wheelchair-accessible bus route (WAB)
  • 2009 (27 Dec): Amended to Boon Lay Integrated Transport Hub (ITH)
  • 2011 (23 Oct): Skips 2 bus stops along Old Choa Chu Kang Road which was removed due to road widening works
  • 2015 (14 Jul): Start of Double-decker bus deployments

Past Routings:

  • Refer to this article
  • 1999: Amended to present routing. No significant route changes since 1999.




External Links:

  • TransitLink E-Guide
  • SGWiki – Buses

Back to Bus Services
Back to Bus Articles


6 thoughts on “SMRT Bus Service 172

  1. Can your SMRT bus services increase the frequency of your bus service 172 during peak hours between 6am to 730am especially route from Choa Chu Kang Ave 3 near Hai Inn Temple(near Brickland Road)

  2. can there me more buses around 6.30am to 8am?
    students will always be late as they couldnt manage to squeeze in the buses. maybe more double deckers please?

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