This article reflects the changes in routes for operational trunk bus services in Singapore. For more information on the exact operating hours and calling bus stops of trunk bus services, please click on the links to their individual bus service articles attached in their headings.

This article is currently under revamp in Phase 2, following the sequence of the introduction date of the bus services, from the oldest to newest bus service:

Phase 2: Services 116, 117/117M, 118, 110

SMRT Bus Service 110 (since 22 Oct 2017)

Year	Route
Year	Direction 1	Direction 2

SBS Transit Bus Service 111 (since 11 Apr 1971)

Year	Route
Year	Direction 1	Direction 2
2005	Ghim Moh Terminal, Ghim Moh Rd, Commonwealth Ave West, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Bras Basah Rd, Raffles Blvd, Temasek Blvd and Temasek Ave (Loop)	Raffles Ave, Stamford Rd, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Commonwealth Ave West, Ghim Moh Rd and Ghim Moh Terminal.
2003	Ghim Moh Terminal, Ghim Moh Rd, Commonwealth Ave West, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Bras Basah Rd, Raffles Blvd, Temasek Blvd and Temasek Ave (Loop)	Raffles Ave, Stamford Rd, Orchard Rd, Penang Rd, Somerset Rd, Orchard Lk, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Commonwealth Ave West, Ghim Moh Rd and Ghim Moh Terminal.
1994	Hougang Ctrl Interchange, Hougang Ctrl, Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Orchard Lk, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Commonwealth Ave West, Ghim Moh Rd and Ghim Moh Terminal.	Ghim Moh Terminal, Ghim Moh Rd, Commonwealth Ave West, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Prinsep St, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Hougang Ctrl and Hougang Ctrl Interchange.
1992	Hougang Interchange, Hougang St 21, Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Orchard Lk, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Commonwealth Ave West, Ghim Moh Rd and Ghim Moh Terminal.	Ghim Moh Terminal, Ghim Moh Rd, Commonwealth Ave West, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Prinsep St, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Hougang St 21 and Hougang Interchange.
1989	Hougang Interchange, Hougang St 21, Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Commonwealth Ave West, Ghim Moh Rd and Ghim Moh Terminal.	Ghim Moh Terminal, Ghim Moh Rd, Commonwealth Ave West, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Hougang St 21 and Hougang Interchange.
1983	Hougang Interchange, Hougang St 21, Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Holland Ave, Holland Dr and Buona Vista Terminal.	Buona Vista Terminal, Nth Buona Vista Rd, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Hougang St 21 and Hougang Interchange.
1982	Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Holland Ave, Holland Dr and Buona Vista Terminal.	Buona Vista Terminal, Nth Buona Vista Rd, Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Simon Rd, Simon Lane, Florence Rd, Lim Ah Pin Rd and Upp Serangoon Rd.
1977	Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Blvd, Grange Rd, Tanglin Rd, Alexandra Rd, Commonwealth Ave, Holland Ave, Holland Dr, Nth Buona Vista Rd and Commonwealth Ave.	Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Simon Rd, Simon Lane, Florence Rd, Lim Ah Pin Rd and Upp Serangoon Rd.
1974	Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Blvd, Paterson Rd, Orchard Rd, Tanglin Rd, Alexandra Rd and Commonwealth Ave.	Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Simon Rd, Simon Lane, Florence Rd, Lim Ah Pin Rd and Upp Serangoon Rd.
1972	Upp Serangoon Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Rd, Tanglin Rd, Alexandra Rd and Commonwealth Ave.	Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Simon Rd, Simon Lane, Florence Rd, Lim Ah Pin Rd and Upp Serangoon Rd.
1971	Upp Serangoon Rd, Bendemeer Rd, Whampoa Nth, Serangoon Rd, Boon Keng Rd, Bendemeer Rd, Jln Besar, Bencoolen St, Orchard Rd, Penang Rd, Somerset Rd, Grange Rd, Orchard Rd, Tanglin Rd, Alexandra Rd and Commonwealth Ave.	Commonwealth Ave, Alexandra Rd, Tanglin Rd, Orchard Rd, Dhoby Ghaut, Selegie Rd, Serangoon Rd, Upp Serangoon Rd, Simon Rd, Simon Lane, Florence Rd, Lim Ah Pin Rd and Upp Serangoon Rd.

SBS Transit Bus Service 112 (since 15 Feb 2004)

Year	Route
Year	Direction 1	Direction 2
2004	Hougang Ctrl Interchange, Hougang Ctrl, Upp Serangoon Rd, Hougang Ave 7, Tampines Rd, Hougang Ave 1, Hougang St 21, Upp Serangoon Rd, Hougang Ave 2, Hougang Ave 8, Hougang Ave 4, Hougang Ave 9 and Hougang St 92 (Loop)	Hougang Ave 9, Hougang Ave 4, Hougang Ave 8, Hougang Ave 2, Upp Serangoon Rd, Hougang St 21, Hougang Ave 1, Tampines Rd, Hougang Ave 7, Upp Serangoon Rd, Hougang Ctrl and Hougang Ctrl Interchange.

SBS Transit Bus Service 112A (since 15 Feb 2004)

Year	Route (Midnight: One-Directional)
2004	Hougang Ctrl Interchange, Hougang Ctrl, Upp Serangoon Rd, Hougang Ave 7, Tampines Rd, Hougang Ave 1, Hougang St 21 and Upp Serangoon Rd (terminating at Kovan Stn Exit B).

SBS Transit Bus Service 113 (since 15 Feb 2004)

Year	Route
Year	Direction 1	Direction 2
2004	Hougang Ctrl Interchange, Hougang Ctrl, Upp Serangoon Rd, Hougang Ave 8, Hougang Ave 6, Hougang Ave 10, Hougang Ave 2, Upp Serangoon Rd, Hougang St 21, Hougang Ave 1, Lor Ah Soo, Hougang St 11 and Upp Paya Lebar Rd (Loop)	Lor Ah Soo, Hougang Ave 1, Hougang St 21, Upp Serangoon Rd, Hougang Ave 2, Hougang Ave 10, Hougang Ave 6, Hougang Ave 8, Upp Serangoon Rd, Hougang Ctrl and Hougang Ctrl Interchange.

SBS Transit Bus Service 113A (since 2005)

Year	Route (AM/PM Peak: One-Directional)
2005	Upp Serangoon Rd, Hougang St 21, Hougang Ave 1, Lor Ah Soo, Hougang St 11, Upp Paya Lebar Rd, Lor Ah Soo, Hougang Ave 1, Hougang St 21 and Upp Serangoon Rd (terminating at Kovan Stn Exit B).

SBS Transit Bus Service 114 (since 25 Oct 2020)

Year	Route
Year	Direction 1	Direction 2
2020	Sengkang Ctrl, Buangkok Dr, Buangkok Lk and Buangkok Cres (Loop)	Buangkok Lk, Buangkok Dr and Sengkang Ctrl.

SBS Transit Bus Service 114A (since 31 Dec 2021)

Year	Route (Midnight: One-Directional)
2021	Sengkang Ctrl, Buangkok Dr, Buangkok Lk and Buangkok Cres (terminating at Blk 998B).

SBS Transit Bus Service 115 (since 30 Oct 2004)

Year	Route
Year	Direction 1	Direction 2
2004	Hougang St 21, Hougang Ave 1, Lor Ah Soo and Hougang Ave 3 (Loop)	Upp Serangoon Rd and Hougang St 21.

SBS Transit Bus Service 116 (since 18 Nov 2012)

Year	Route
Year	Direction 1	Direction 2

SBS Transit Bus Service 116A (since 15 Apr 2019)

Year	Route (AM Peak: One-Directional)

SBS Transit Bus Service 117 (since 20 Dec 2015)

Year	Route
Year	Direction 1	Direction 2

SBS Transit Bus Service 117A (since 14 Jan 2019)

Year	Route (AM Peak: One-Directional)

SBS Transit Bus Service 117M (since 29 Nov 2021)

Year	Route
Year	Direction 1	Direction 2

Go-Ahead Bus Service 118 (since 20 Dec 2015)

Year	Route
Year	Direction 1	Direction 2

Go-Ahead Bus Service 118A (since 10 Apr 2017)

Year	Route (AM Peak: One-Directional)

Go-Ahead Bus Service 118B (since 10 Apr 2017)

Year	Route (PM Peak: One-Directional)

Go-Ahead Bus Service 119 (since 14 Sep 2003)

Year	Route
Year	Direction 1	Direction 2
2012	Punggol Interchange, Punggol Pl, Punggol Field, Punggol Way, Sengkang East Rd, Sengkang East Way, Rivervale Dr, Sengkang East Ave, Punggol Rd, Hougang Ave 10, Hougang Ave 8, Upp Serangoon Rd and Hougang St 21 (Loop)	Hougang Ave 1, Tampines Rd, Upp Serangoon Rd, Hougang Ave 8, Hougang Ave 10, Punggol Rd, Sengkang East Ave, Rivervale Dr, Sengkang East Way, Sengkang East Rd, Punggol Way, Punggol Field, Punggol Pl and Punggol Interchange.
2003	Sengkang Interchange, Sengkang Sq, Compassvale Rd, Sengkang East Way, Rivervale Dr, Sengkang East Ave, Punggol Rd, Hougang Ave 10, Hougang Ave 8, Upp Serangoon Rd and Hougang St 21 (Loop)	Hougang Ave 1, Tampines Rd, Upp Serangoon Rd, Hougang Ave 8, Hougang Ave 10, Punggol Rd, Sengkang East Ave, Rivervale Dr, Sengkang East Way, Sengkang Sq and Sengkang Interchange.

External Links & References:

SBS Bus Guides 1980 – 1990/1991
TransitLink Guides 1992 – 2014
Transitlink eGuide
SGWiki – History of Bus Services

Back to Historical Routes of Bus Services

Historical Routes of Trunk Services 110 – 119