Tower Transit Bus Service 173

Tower Transit Bus Service 173 is a trunk route running from Bukit Batok Bus Interchange and looping at Clementi Bus Interchange, passing through Bukit Batok Street 21, Hillview, Hume Avenue, Upper Bukit Timah, Lorong Kismis, Toh Tuck and Commonwealth Avenue West.

Allocated to the Bus Contracting Model (Bulim Bus Package), Tower Transit Singapore took over operations of this bus service from SMRT Buses since 29 May 2016.

Bus Service 173: Bukit Batok – Clementi (Loop)
From Bukit Batok Looping at Clementi
  • Bt Batok Ctrl
    – Bt Batok Int NS2
    – Blk 628 NS2
    – Opp Blk 120
  • Bt Batok Ave 1
    – Opp Blk 102 NS2
  • Bt Batok East Ave 6
    – Opp Bt Batok Swim Cplx
  • Bt Batok St 21
    – Opp Bt View Sec Sch
    – Blk 217
  • Bt Batok East Ave 4
    – Blk 254
  • Bt Batok East Ave 2 (Express)
  • Hillview Ave
    – Opp The Petals Condo
    – Opp Hillview Apts
  • Jln Remaja (Express)
  • Jln Batu Nilam
    – Aft Jln Remaja
    – Opp Hillbrooks
  • Elizabeth Dr (Express)
  • Hillview Ave
    – Opp Hillview Hts
  • Hume Ave
    – Bef Summerhill
    – Opp Symphony Hts
  • Upp Bt Timah Rd
    – Opp The Hillside
    – Aft Bt Timah Fire Stn
    – Southaven II
    – Beauty World Stn Exit A DT5
  • Jln Jurong Kechil
    – Beauty World Stn Exit C DT5
    – Blk 18
  • Toh Tuck Rd
    – Aft Jln Jurong Kechil
  • Toh Tuck Terr
    – Hse No. 45
  • Lor Kismis
    – Bef Eng Kong Pl
  • Toh Tuck Rise
    – Opp Toh Tuck Cres
  • Toh Tuck Rd
    – Aft Toh Tuck Rise
  • Toh Tuck Ave
    – SMRT Ulu Pandan Depot
    – Aft Toh Tuck Lk
  • C’wealth Ave West
    – Aft Toh Tuck Ave
    – Blk 203
    – Blk 317
  • Clementi Ave 3
    – Clementi Int EW23
  • C’wealth Ave West
    – Opp Blk 317
    – Nan Hua Pr Sch
    – Bef Toh Tuck Ave
  • Toh Tuck Ave
    – Bef Toh Tuck Lk
    – Opp SMRT Ulu Pandan Depot
  • Toh Tuck Rd
    – Bef Toh Tuck Rise
  • Toh Tuck Rise
    – Aft Toh Tuck Cres
  • Lor Kismis
    – Aft Eng Kong Pl
  • Toh Tuck Terr
    – Opp Hse No. 19
  • Toh Tuck Rd
    – Bef Jln Jurong Kechil
  • Jln Jurong Kechil
    – Opp Blk 19
    – Opp Beauty World Stn DT5
  • Upp Bt Timah Rd
    – Beauty World Stn Exit B DT5
    – Woh Hup Bldg
    – Bt Regency
    – Aft Old Jurong Rd
  • Hume Ave
    – Symphony Hts
    – Hillview Green
  • Hillview Ave
    – Hillview Hts
  • Elizabeth Dr (Express)
  • Jln Batu Nilam
    – Hillbrooks
  • Jln Remaja
    – Hillview Hse
  • Hillview Ave
    – Hillview Apts
    – The Petals Condo
  • Bt Batok East Ave 2 (Express)
  • Bt Batok East Ave 4
    – Blk 272
  • Bt Batok St 21
    – Opp Blk 217
    – Bt View Sec Sch
  • Bt Batok East Ave 6
    – Bt Batok Swim Cplx
  • Bt Batok Ave 1
    – Blk 102 NS2
  • Bt Batok Ctrl
    – Bt Batok CC
    – Opp Blk 628 NS2
    – Bt Batok Int NS2


  • Bus Service 173 towards Clementi calls at Bus Stop 43261 Opp Hillview Hts, (B04) Hillview Ave while Bus Service 173 towards Bukit Batok calls at Bus Stop 43267 Hillview Hts, (B03) Hillview Ave
Technical Information
Route WAB_logo_20px Bukit Batok Bus Interchange ↺ Clementi Bus Interchange (Loop)
Passes Through Bukit Batok St 21, Hillview, Hume Ave, Upp Bukit Timah, Lor Kismis, Toh Tuck, Clementi
Route Length 27.4 km
Travelling Time 85 mins
Operator Information
BCM Route Package Bulim Bus Package
Current Operator Tower Transit Singapore Pte Ltd
(Tower Transit Singapore)
Current Depot Bulim Bus Depot (BUDEP)
Current Fleet 12-metre Single Deck Buses:
– Mercedes-Benz O530 Citaro
Departure Times from Bukit Batok
0530 – 2330 (Weekdays, Saturdays)
0600 – 2330 (Sundays/PHs)
2345 – 0100 (Daily | Service 173A*, terminates at Bukit Batok East Avenue 4 (Blk 254))
Departure Times from Clementi 0550 – 0013 (Weekdays)
0553 – 0010 (Saturdays)
0600 – 0012 (Sundays & Public Holidays)
Frequency Loop Service
0630-0830: 08 – 12 mins
0831-1659: 09 – 14 mins
1700-1900: 09 – 10 mins
After 1900: 15 mins
Notes Service 173A operates from Bukit Batok Interchange to Bukit Batok East Avenue 4 (Blk 254). Buses leaving Bt Batok Int after 2330 hours will operate as 173A.

Route History

Service 173 is a residential trunk route connecting the housing estates of Bukit Batok and Clementi, and the private estates of Hillview, Hume, Upper Bukit Timah, Toh Tuck and Lorong Kismis to Bukit Batok and Clementi Town Centres. Much of its route serves residents of private estates and condominiums along its route, and it is the only SMRT bus service at Clementi Bus Interchange.

As the route covers low-density estates, demand is relatively low during most parts of day, but particularly high during the peak hours. Between Bukit Batok and Clementi, Service 106 offers a faster journey as compared to this route.

Formerly a Singapore Bus Service (SBS) route since the 1970s, the route was transferred to Trans-Island Bus Service (TIBS) in 2000 and has been operated by SMRT until its it was re-allocated to the Bus Contracting Model (Bulim Bus Package) in May 2016. High capacity double-deck buses are not deployed due to insufficient demand and road limitations within the many narrow roads which the route serves.

A Short Trip Service, Service 173A, will operate after the last bus has departed Bukit Batok Interchange to connect residents to the housing estates at late hours. During Eves of Public Holidays, last bus timings of Service 173A will be extended to complement the extension of train operating hours.

Fare: Charges basic distance fares. See Bus Fares. Calculate your bus fare using LTA’s fare calculator on here.

MRT Stations Served
Special Departures
  • Upp Bukit Timah Rd (Beauty World Stn Exit A)  Clementi Int  Bukit Batok Int
    Weekdays: From 0530hrs till before 0555hrs
    Saturdays: From 0535hrs till before 0550hrs
  • Jln Jurong Kechil (Opp Beauty World Stn) → Bukit Batok Int
    Weekdays: From 0540hrs till before 0605hrs
  • Clementi Int  Bukit Batok Int
    Sundays & Public Holidays: From 0600hrs till before 0640hrs
Short Trip Service
  • Service 173A: Bukit Batok Interchange → Bukit Batok East Avenue 4 (Blk 254)
    Weekdays: 2345hrs – 0100hrs | 15 min frequency
    Saturdays, Sundays & Public Holidays: 2348hrs – 0100hrs


Operator History
  • 1971 – 1973: United Bus Company
  • 1973 – 2000: Singapore Bus Services
  • 2000 –  2004: Trans-Island Bus Services
  • 2004 – 28 May 2016: SMRT Buses
  • 29 May 2016 onwards: Tower Transit Singapore

The Bus Service Operating License (BSOL) for this route will be renewed in 2021 under the Bulim Bus Package.

  • 1971 (11 Apr): Introduced between Princess Elizabeth Ter and New Bridge Rd Ter under 1971 Bus Reorganisation, operated by United Bus Company
  • 1973 (01 Nov): Operated by Singapore Bus Service (SBS)
  • 1974 (24 Feb): Amended to ply Grange Rd and Orchard Blvd with the conversion of Orchard Rd to one-way road, skipping Orchard Rd
  • 1979 (30 Dec): Amended to ply Jln Anak Bt towards New Bridge Rd Ter with the partial conversion of Upp Bt Timah Rd to one-way road
  • 1986 (16 Nov): Calls at the staggered bus stop outside Thong Teck Bldg along Scotts Rd, skipping the bus stop outside Metro Orchard
  • 1987 (06 Jun): Amended to the relocated New Bridge Rd Ter
  • 1987 (27 Sep): 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
  • 1987 (01 Nov): Amended to ply Eu Tong Sen St towards Princess Elizabeth Ter to facilitate the second stage of road expansion along New Bridge Rd
  • 1987 (13 Dec): Calls at a staggered bus stop outside Orchard Stn along Orchard Blvd, skipping the bus stop opposite Orchard Stn
  • 1989 (29 Jan): Calls at a relocated bus stop opposite Sri Mariamman Tp along South Bridge Rd, skipping the bus stop opposite Jamae Mosque
  • 1990 (10 Mar): Re-routed to Bt Batok Int – Jln Anak Bukit (Loop), via Bt Batok Central and Bt Batok St 21 instead of Bt Batok East Ave 3.
  • 1991 (07 Apr): Integrated with Service 205 and extended to Clementi Int under TransitLink Network Integration Exercise Phase 3
  • 1992 (03 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: Amended to loop at Clementi Int from Bt Batok Int
  • 2000 (24 Dec): Handed to Trans-Island Bus Services (TIBS)
  • 2003: Calls at the bus stop opposite Bt Timah Plaza along Jln Anak Bt with the abolition of the bus stop under the PIE Flyover
  • 2004 (10 May): Operated by SMRT Buses
  • 2006 (16 Jul): Amended to ply along Bt Batok Ctrl, Bt Batok Ave 1 & Bt Batok East Ave 6 before entering Bt Batok St 21 and at the same time, amended to Hume Ave instead of Hillview Rd & Upp Bt Timah Rd.
  • 2006 (29 Oct): Amended to Clementi Temp Int
  • 2011 (26 Nov): Amended to Clementi Integrated Transport Hub (ITH)
  • 2013 (21 Apr): Designated wheelchair-accessible bus route (WAB)
  • 2015 (27 Dec): Amended to skip Jalan Anak Bukit towards Clementi to connect with Beauty World Station
  • 2016 (29 May): Re-allocated to the Government Contracting Model (Bulim Bus Package), and operations transferred from SMRT Buses to Tower Transit Singapore

Past Routings:


External Links & References:

Back to Bulim Bus Package
Back to Bus Services
Back to Bus Articles

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2 thoughts on “Tower Transit Bus Service 173

  • 16 April 2018 at 2:36 PM

    Feed Back:
    One of your bus 173 was spewing tons of thick black smoke when I drove behind it along Humes into Hillview Ave ydy Sunday 15/04/18 around 1pm. I hope you folks at Tower will fix it before the LTA catches up and fine you. Very bad PR you know. The bus no is SMB 3012G

    I took a photo of the bus condition. If u want one, let me know and I will send to you.

  • 19 August 2017 at 10:56 PM

    How does one knows which way the service is going (ie towards BT Batok or Clementi Interchange) if one waits at the bus stop opposite and before Jln Batu Nilam?


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