Tower Transit Bus Service 171

Tower Transit Bus Service 171 is a trunk route linking Yishun and Bukit Panjang, passing through Sembawang Rd, Mandai Rd and Petir Rd.

Yishun Int
↺ Bukit Panjang MRT (Loop)
59009 Yishun Int B3 NS13 Yishun Ave 2
59141 Blk 741 Yishun Ave 5
59111 Blk 701 Yishun Ave 5
57089 Blk 713 Sembawang Rd
57079 Khatib Camp Sembawang Rd
57069 Opp Dieppe Barracks Sembawang Rd
57059 Opp Sembawang Air Base Sembawang Rd
48149 Mandai Crematorium & Columbarium Mandai Ave
48069 Aft Mandai Ave Mandai Rd
48059 Opp Mandai Agrotech Pk Mandai Rd
48049 Bef Jln Ulu Sembawang Mandai Rd
48039 LP 159 Mandai Rd
48029 Bef Mandai Lake Rd Mandai Rd
48019 Mandai Camp 2 Mandai Rd
44269 Blk 223 Bt Panjang Rd
44229 Bef Pending Stn BP8 Pending Rd
44219 Bet Blks 139/140 Petir Rd
44209 Opp Petir Stn BP7 Petir Rd
44731 Opp Blk 180 DT1-BP6 Jelebu Rd
44909 Blk 184 Bt Panjang Rd
44029 Bt Panjang Stn Exit A/Lrt DT1-BP6 Upp Bt Timah Rd
44201 Aft Petir Stn BP7 Petir Rd
44211 Blk 127 Petir Rd
44221 Opp Pending Stn BP8 Pending Rd
44261 Blk 270 Bt Panjang Rd
48011 Opp Mandai Camp 2 Mandai Rd
48021 Aft Mandai Lake Rd Mandai Rd
48031 LP 162 Mandai Rd
48041 Aft Jln Ulu Sembawang Mandai Rd
48051 Mandai Agrotech Pk Mandai Rd
48061 Bef Mandai Ave Mandai Rd
48141 Opp Mandai Crematorium & Columbarium Mandai Ave
57051 Aft Sembawang Air Base Sembawang Rd
57061 Dieppe Barracks Sembawang Rd
57071 Opp Khatib Camp Sembawang Rd
57081 Opp Blk 713 Sembawang Rd
59119 Opp Blk 701A Yishun Ave 5
59149 Blk 145 Yishun Ave 5
59159 Opp Yishun Stn Exit B NS13 Yishun Ave 5
59009 Yishun Int NS13 Yishun Ave 2
Route Overview
Route WAB_logo_20px Yishun Bus Interchange ↺ Upper Bukit Timah Road (Loop)
Passes Through Yishun Ave 5, Sembawang Rd, Mandai Rd, Petir Rd
Route Length
31.3 km
Travelling Time 75 mins
Operator Information
BCM Route Package Sembawang–Yishun Bus Package
Current Operator Tower Transit Singapore Pte Ltd
(Tower Transit Singapore)
Current Depot Mandai Bus Depot
Current Fleet Single Deck Bus
Mercedes-Benz OC500LE
Double Deck Bus
Alexander Dennis Enviro500

Operating Hours
Departure Times from Yishun Daily
05:30 – 23:30
Operating Frequency
6:30am–8.30am 8.31am–4.59pm 5.00pm–7.00pm After 7.00pm
Loop Service
9 – 13 mins 11 – 13 mins 10 – 13 mins 11 – 13 mins
Fare Information
Fare Charges regular distance fares


Service 171 is an inter-town route serving between the areas of Yishun and Bukit Panjang. It is a key inter-town connection between the towns of Yishun and Bukit Panjang, via BKE and Mandai Road, with no other public bus route offering a faster route.

This service plies a short express sector on the Bukit Timah Expressway (BKE), between Mandai Road and Bukit Panjang Road.

Originally planned to be shortened to loop at Bukit Panjang MRT from 16 August 2020, the implementation date was deferred to 30 August 2020 following the Controversy over Bus 700 withdrawal and Bus 171 & 972 amendment.

Double Decker Bus Deployments

On 24 August 2015, SMB5059J (Alexander Dennis Enviro500) performed Service 171 in the evening as part of a crossover slot (969S151). On its maiden trip from Yishun to Marina Centre, the bus was withdrawn from revenue service at Bukit Panjang by the Operations Control Centre (OCC), which was likely due to the route not being officially certified as ready for double-decker deployment.

Another incident happened on 08 December 2016, where a MAN A95 Bus (SG5744S) performed Service 171 for several trips before being pulled out of service.

From 12 August 2018, double-decker buses were deployed on high-capacity bus slots on Service 171 on Sundays / Public Holidays, replacing articulated buses. Double decker buses are no longer deployed since the route amendment on 30 August 2020.

Special Departures
  • Jelebu Rd (Opp Blk 180) → Yishun Int
    Weekdays: 05:35, 05:42, 05:49 & 05:56
MRT/LRT Stations Served

Gallery (Tower Transit):

Gallery (SMRT Buses) at Page 2.

Poster Gallery:


Operator History:
  • 1971 – 1973: United Bus Company Pte Ltd
  • 1973 – 1995: Singapore Bus Services Ltd
  • 1995 –  2004: Trans-Island Bus Services Ltd
  • 2004 – 04 Sep 2021: SMRT Buses Ltd
  • 05 Sep 2021 – Present: Tower Transit Singapore Pte Ltd

The Bus Service Operating License (BSOL) for this route will be renewed in 2026 under the Sembawang–Yishun Bus Package.

  • 1971 (11 Apr): Introduced between Sembawang Ter and Queen St Ter under 1971 Bus Reorganisation
  • 1973 (25 Jun): Amended to ply Mandai Lake Rd in both directions until 2200 hours daily
  • 1979 (28 Oct): 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
  • 1979 (30 Dec): 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 Apr): 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 Oct): Amended to the relocated Queen St Ter along Ban San St, skipping Arab St
  • 1987 (18 Jan): Amended to Yishun Central Ter
  • 1987 (23 Aug): Amended to Yishun Int
  • 1987 (13 Dec): 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: Amended to ply Orchard Link, skipping Grange Rd
  • 1993 (03 Jan): 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 Apr): Amended to skip Mandai Lake Rd and amended to ply Mandai Ave with the introduction of Service 138
  • 1995: Amended to ply Orchard Turn
  • 1995 (05 Nov): Handed to Trans-Island Bus Services (TIBS)
  • 1999 (26 Dec): Amended to ply BKE, Bt Panjang Rd, Petir Rd, Jelebu Rd under Bukit Panjang LRT Rationalisation, skipping Woodlands Rd and Cashew Rd
  • 2000: Serves new bus stop before Goldhill Ave along Dunearn Rd
  • 2000: Serves additional bus stop opposite Sembawang Air Base along Sembawang Rd
  • 2002 (07 Jul): 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 Aug): Serves the bus stop outside Northpoint Shop Ctr along Yishun Ave 2, skipping the bus stop outside Blk 923
  • 2005 (02 Jul): Amended to ply Grange Rd and Orchard Link with the partial closure of Somerset Rd
  • 2006 (29 Oct): Serves relocated bus stop outside Orchard Stn along Orchard Turn
  • 2009 (01 Jun): Designated wheelchair-accessible bus route (WAB)
  • 2009 (21 Jun): 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 (04 Sep): Serves new bus stop outside Botanic Gdns Stn along Bt Timah Rd
  • 2015 (01 Mar): Serves reinstated bus stop outside Assumption Pathway Sch along Upp Bt Timah Rd
  • 2015 (14 Mar): Amended to Yishun Temp Int
  • 2015 (27 Dec): Serves new bus stop outside Blk 184 along Bt Panjang Rd, skipping the bus stop outside Blk 183 as part of DTL2 Bukit Panjang Bus Service Enhancements
  • 2017 (04 Sep): Skips a pair of bus stops outside and opposite Bt Panjang Plaza along Jelebu Rd
  • 2018 (25 Feb): Serves additional pair of bus stops outside and opposite Blk 180 along Jelebu Rd
  • 2019 (08 Sep): Amended to Yishun Integrated Transport Hub
  • 2020 (03 Aug): Announcement of Route Amendment to loop at Bukit Panjang MRT from 16 Aug 2020
  • 2020 (13 Aug): Route Amendment announced to be deferred to 30 Aug 2020
  • 2020 (30 Aug): Shortened to loop at Upper Bukit Timah Road (Bukit Panjang MRT)
  • 2021 (05 Sep): Operations transferred to Tower Transit under the Sembawang–Yishun Bus Package

Past Routings

Back to Bus Services
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38 thoughts on “Tower Transit Bus Service 171

  • 5 September 2020 at 9:45 AM

    Now service 171 is demoted, why using those OC500LE buses?? Better to deploy CITARO buses or retain MAN NL323F buses.

    • 27 September 2020 at 4:33 PM

      There is sometimes have MAN A22. I first took 171 amendment as MAN A22 back 31 August 2020. Also, sometimes they will deploy CITARO. Anytime they can deploy, trust me

  • 15 August 2020 at 6:36 PM

    Is LTA honestly serious ??? Just saw and took 171 at orchard area back to yishun. The bus had a gd loading and was in good demand.
    Not jus my bus but other 171 also was having gd pax loads. Even 700 had a gd amt of pax. I feel its very evil of lta to do this.

    • 23 August 2020 at 10:25 AM

      Bus drivers were tested for COVID-19. Nobody wants to be in the bus for too long, this is an unsafe condition. However, without COVID-19, they may want to keep the service.

      • 18 April 2022 at 2:36 PM

        Why do you think they may want to keep the service? For a car lite nation, a 20 minute town & a 45 minute city? To provide alternate travel options in the event of an MRT breakdown especially for the Downtown, North South & Circle MRT Lines?

    • 27 September 2020 at 4:35 PM

      Alot of residents in Yishun will prefer to take 167/167e or North South Line to Orchard/City area, sometimes with 851/851e or 857. While for Bukit Panjang, it’s obvious many will prefer to take either 190, 960 or 972/972M. 171 is too long back then, so obviously no passengers want to sit on the long 171 ride to Orchard, as they prefer taking faster route

  • 12 August 2020 at 9:12 PM

    Please go to Bukit Panjang bus interchange to do the looping point if there’s a need to shorten the route, just like bus service 180. Then exit from the bus interchange to serve the bus stop Blk 180, before going back to Yishun.

  • 7 August 2020 at 12:55 AM

    There so many ways they could have saved it. The could have atleast converted it to become as 171e ply the usual route but limt the stops along bukit timah. Than atleast even with the cut. Many pax who take 171 along the cut of sector wont be affected. And who knows may even become profitable.

    • 27 September 2020 at 4:36 PM

      That’s no use, 171 have been duplicated by many bus services back before amendment.

  • 7 August 2020 at 12:49 AM

    Wait till mrt breakdown again. Than they will start to understand the importance of this bus routes. Clearly LTA never learn from their past mistakes.

    • 13 August 2020 at 5:32 PM

      Many residents in Yishun will rather take 857 to Marina Centre area and people go Orchard area normally will either take:

      – SMRT 167
      – SMRT 167e
      – Upcoming TEL from 2020-2021 again.

      NSEWL have been doing Early Closure Late Opening at selected sectors every month to facilitate maintenance works regularly to prevent huge disruptions

      • 4 September 2020 at 10:18 PM

        And also need to consider the hassle of transferring by purely rail travel between Yishun and Bukit Timah as well

        • 27 September 2020 at 4:36 PM

          Yishun and Bukit Timah, there’s 852 btw……….

    • 13 August 2020 at 6:41 PM

      There’s 67 and 170 to cover for almost the entire stretch of DTL2, along with 66, 961 etc for other partial sectors. When MRT breaks down SBST will cover with temporary bridging buses.

      Resources should only be applied where they are due, otherwise it would lead to waste.


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