Tower Transit Bus Service 171 is a trunk route linking Yishun and Bukit Panjang, passing through Sembawang Rd, Mandai Rd and Petir Rd.
↺ Bukit Panjang MRT (Loop)
|Route||Yishun Bus Interchange ↺ Upper Bukit Timah Road (Loop)
|Passes Through||Yishun Ave 5, Sembawang Rd, Mandai Rd, Petir Rd|
|Travelling Time||75 mins|
|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
– MAN A22
– Mercedes-Benz OC500LE
|Double Deck Bus
– Alexander Dennis Enviro500
– MAN A95
|Departure Times from Yishun||Daily|
|05:30 – 23:30|
||9 – 13 mins||11 – 13 mins||10 – 13 mins||11 – 13 mins|
|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 On its maiden trip from Yishun to Marina Centre, the bus was withdrawn from revenue service at Bukit Panjang by the Operations Control Centre (OCC), which was likely due to the route not being officially certified as ready for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.
- 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.
- 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