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.
Tower Transit Bus Service 980 (since 27 Dec 1998)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2006 | Sembawang Interchange, Sembawang Vista, Canberra Rd, Admiralty Dr, Sembawang Dr, Sembawang Ave, Sembawang Rd, Upp Thomson Rd, Thomson Rd, Keng Lee Rd, Kg Java Rd, Bt Timah Rd, Sungei Rd, Bencoolen St, Middle Rd, Beach Rd, Crawford St, Kallang Rd, Sims Ave, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Geylang Rd, Kallang Rd, Crawford St, Nth Bridge Rd, Jln Sultan, Beach Rd, Middle Rd, Victoria St, Rochor Rd, Rochor Canal Rd, Bt Timah Rd, Kg Java Rd, Thomson Rd, Upp Thomson Rd, Sembawang Rd, Sembawang Ave, Sembawang Dr, Admiralty Dr, Canberra Rd, Sembawang Vista and Sembawang Interchange. |
| 2005 | Sembawang Interchange, Sembawang Vista, Sembawang Dr, Sembawang Ave, Sembawang Rd, Upp Thomson Rd, Thomson Rd, Keng Lee Rd, Kg Java Rd, Bt Timah Rd, Sungei Rd, Bencoolen St, Middle Rd, Beach Rd, Crawford St, Kallang Rd, Sims Ave, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Geylang Rd, Kallang Rd, Crawford St, Nth Bridge Rd, Jln Sultan, Beach Rd, Middle Rd, Victoria St, Rochor Rd, Rochor Canal Rd, Bt Timah Rd, Kg Java Rd, Thomson Rd, Upp Thomson Rd, Sembawang Rd, Sembawang Ave, Sembawang Dr, Sembawang Vista and Sembawang Interchange. |
| 1998 | Admiralty Rd West Terminal, Admiralty Rd West, Canberra Rd, Sembawang Rd, Upp Thomson Rd, Thomson Rd, Keng Lee Rd, Kg Java Rd, Bt Timah Rd, Sungei Rd, Bencoolen St, Middle Rd, Beach Rd, Crawford St, Kallang Rd, Sims Ave, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Geylang Rd, Kallang Rd, Crawford St, Nth Bridge Rd, Jln Sultan, Beach Rd, Middle Rd, Victoria St, Rochor Rd, Rochor Canal Rd, Bt Timah Rd, Kg Java Rd, Thomson Rd, Upp Thomson Rd, Sembawang Rd, Canberra Rd, Admiralty Rd West and Admiralty Rd West Terminal. |
Tower Transit Bus Service 981 (since 9 Nov 1999)
| Year | Route (One-Directional) | |
| AM Peak | PM Peak | |
| 2005 | Sembawang Interchange, Sembawang Vista, Sembawang Dr, Sembawang Way, Canberra Rd, Admiralty Rd West, Senoko Ave, Senoko Dr, Senoko Rd, Senoko Dr and Senoko Loop. | Senoko Rd, Senoko Dr, Senoko Loop, Senoko Dr, Senoko Ave, Admiralty Rd West, Canberra Rd, Sembawang Way, Sembawang Dr, Sembawang Vista and Sembawang Interchange. |
| 2002 | Sembawang Way, Canberra Rd, Admiralty Rd West, Senoko Ave, Senoko Dr, Senoko Rd, Senoko Dr and Senoko Loop. | Senoko Rd, Senoko Dr, Senoko Loop, Senoko Dr, Senoko Ave, Admiralty Rd West, Canberra Rd and Sembawang Way. |
| 1999 | Canberra Rd, Admiralty Rd West, Senoko Ave, Senoko Dr, Senoko Rd, Senoko Dr and Senoko Loop. | Senoko Rd, Senoko Dr, Senoko Loop, Senoko Dr, Senoko Ave, Admiralty Rd West and Canberra Rd. |
SMRT Bus Service 983 (since 25 Apr 2015)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2015 (Dec) | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Ave 5, Choa Chu Kang Ave 6, Choa Chu Kang Ave 1, Choa Chu Kang Ave 7, Choa Chu Kang Gr, Choa Chu Kang Way, Choa Chu Kang Rd, Upp Bt Timah Rd, Petir Rd, Jelebu Rd and Bt Panjang Rd (Loop) | Choa Chu Kang Rd, Choa Chu Kang Way, Choa Chu Kang Gr, Choa Chu Kang Ave 7, Choa Chu Kang Ave 1, Choa Chu Kang Ave 6, Choa Chu Kang Ave 5, Choa Chu Kang Ave 4, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
| 2015 (Apr) | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Ave 5 and Keat Hong Cl (Loop) | Choa Chu Kang Ave 5, Choa Chu Kang Ave 4, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
SMRT Bus Service 983A (since 30 Sep 2018)
| Year | Route (Last Bus: One-Directional) |
| 2018 | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Ave 5, Choa Chu Kang Ave 6, Choa Chu Kang Ave 1, Choa Chu Kang Ave 7, Choa Chu Kang Gr, Choa Chu Kang Way and Choa Chu Kang Rd (terminating at Blk 26). |
SMRT Bus Service 983M (since 18 Mar 2024)
| Year | Route (AM Peak: One-Directional) |
| 2024 | Choa Chu Kang Ave 5, Choa Chu Kang Ave 6, Choa Chu Kang Ave 1, Choa Chu Kang Ave 7, Choa Chu Kang Gr, Choa Chu Kang Way, Choa Chu Kang Ave 1 and Teck Whye Cres. |
SMRT Bus Service 985 (since 27 Jul 2003)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2014 | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Teck Whye Ave, Choa Chu Kang Rd, Bt Batok Rd, Bt Batok West Ave 5, Bt Batok West Ave 7, Bt Batok West Ave 4, Bt Batok West Ave 2, Bt Batok Ctrl, Bt Batok East Ave 2, Bt Batok East Ave 6, Jln Jurong Kechil, PIE, Jln Toa Payoh, Bendemeer Rd, Boon Keng Rd, Upp Boon Keng Rd, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Lor 1 Geylang, Upp Boon Keng Rd, Boon Keng Rd, Serangoon Rd, Jln Toa Payoh, Whitley Rd, PIE, Jln Anak Bt, Upp Bt Timah Rd, Jln Jurong Kechil, Bt Batok East Ave 6, Bt Batok East Ave 2, Bt Batok Ctrl, Bt Batok West Ave 2, Bt Batok West Ave 4, Bt Batok West Ave 7, Bt Batok West Ave 5, Bt Batok Rd, Choa Chu Kang Rd, Teck Whye Ave, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
| 2012 | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Teck Whye Ave, Choa Chu Kang Rd, Bt Batok Rd, Bt Batok West Ave 5, Bt Batok West Ave 7, Bt Batok West Ave 4, Bt Batok West Ave 2, Bt Batok Ctrl, Bt Batok East Ave 2, Bt Batok East Ave 6, Jln Jurong Kechil, Upp Bt Timah Rd, Bt Timah Lk, PIE, Jln Toa Payoh, Bendemeer Rd, Boon Keng Rd, Upp Boon Keng Rd, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Lor 1 Geylang, Upp Boon Keng Rd, Boon Keng Rd, Serangoon Rd, Jln Toa Payoh, Whitley Rd, PIE, Jln Anak Bt, Upp Bt Timah Rd, Jln Jurong Kechil, Bt Batok East Ave 6, Bt Batok East Ave 2, Bt Batok Ctrl, Bt Batok West Ave 2, Bt Batok West Ave 4, Bt Batok West Ave 7, Bt Batok West Ave 5, Bt Batok Rd, Choa Chu Kang Rd, Teck Whye Ave, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
| 2006 | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Teck Whye Ave, Choa Chu Kang Rd, Bt Batok Rd, Bt Batok West Ave 5, Bt Batok West Ave 7, Bt Batok West Ave 4, Bt Batok West Ave 2, Bt Batok Ctrl, Bt Batok East Ave 2, Bt Batok East Ave 6, Jln Jurong Kechil, PIE, Jln Toa Payoh, Bendemeer Rd, Boon Keng Rd, Upp Boon Keng Rd, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Lor 1 Geylang, Upp Boon Keng Rd, Boon Keng Rd, Serangoon Rd, Jln Toa Payoh, Whitley Rd, PIE, Jln Anak Bt, Upp Bt Timah Rd, Jln Jurong Kechil, Bt Batok East Ave 6, Bt Batok East Ave 2, Bt Batok Ctrl, Bt Batok West Ave 2, Bt Batok West Ave 4, Bt Batok West Ave 7, Bt Batok West Ave 5, Bt Batok Rd, Choa Chu Kang Rd, Teck Whye Ave, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
| 2004 (Dec) | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Teck Whye Ave, Choa Chu Kang Rd, Bt Batok Rd, Bt Batok West Ave 7, Bt Batok West Ave 4, Bt Batok West Ave 2, Bt Batok Ctrl, Bt Batok East Ave 2, Bt Batok East Ave 6, Jln Jurong Kechil, PIE, Jln Toa Payoh, Bendemeer Rd, Boon Keng Rd, Upp Boon Keng Rd, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Lor 1 Geylang, Upp Boon Keng Rd, Boon Keng Rd, Serangoon Rd, Jln Toa Payoh, Whitley Rd, PIE, Jln Anak Bt, Upp Bt Timah Rd, Jln Jurong Kechil, Bt Batok East Ave 6, Bt Batok East Ave 2, Bt Batok Ctrl, Bt Batok West Ave 2, Bt Batok West Ave 4, Bt Batok West Ave 7, Bt Batok Rd, Choa Chu Kang Rd, Teck Whye Ave, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
| 2004 (Apr) | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Teck Whye Ave, Choa Chu Kang Rd, Bt Batok Rd, Bt Batok West Ave 7, Bt Batok West Ave 4, Bt Batok West Ave 2, Bt Batok Ctrl, Bt Batok East Ave 2, Bt Batok East Ave 6, Jln Jurong Kechil, PIE, Jln Toa Payoh, Bendemeer Rd, Boon Keng Rd, Upp Boon Keng Rd, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Geylang Rd, Kallang Rd, Sims Ave, Lor 1 Geylang, Upp Boon Keng Rd, Boon Keng Rd, Serangoon Rd, Jln Toa Payoh, Whitley Rd, PIE, Jln Anak Bt, Upp Bt Timah Rd, Jln Jurong Kechil, Bt Batok East Ave 6, Bt Batok East Ave 2, Bt Batok Ctrl, Bt Batok West Ave 2, Bt Batok West Ave 4, Bt Batok West Ave 7, Bt Batok Rd, Choa Chu Kang Rd, Teck Whye Ave, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
| 2003 | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Teck Whye Ave, Choa Chu Kang Rd, Bt Batok Rd, Bt Batok West Ave 7, Bt Batok West Ave 4, Bt Batok West Ave 2, Bt Batok Ctrl, Bt Batok East Ave 2, Bt Batok East Ave 6, Jln Jurong Kechil, PIE, Jln Toa Payoh, Bendemeer Rd, Boon Keng Rd, Upp Boon Keng Rd, Lor 1 Geylang, Geylang Rd and Lor 1 Geylang Terminal. | Lor 1 Geylang Terminal, Lor 1 Geylang, Upp Boon Keng Rd, Boon Keng Rd, Serangoon Rd, Jln Toa Payoh, Whitley Rd, PIE, Jln Anak Bt, Upp Bt Timah Rd, Jln Jurong Kechil, Bt Batok East Ave 6, Bt Batok East Ave 2, Bt Batok Ctrl, Bt Batok West Ave 2, Bt Batok West Ave 4, Bt Batok West Ave 7, Bt Batok Rd, Choa Chu Kang Rd, Teck Whye Ave, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. |
Tower Transit Bus Service 990 (since 15 Nov 2014)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2014 | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok East Ave 3, Bt Batok East Ave 6, Bt Batok Ave 1, Jurong East Ctrl, Toh Guan Rd, Boon Lay Way, Jurong East Ctrl and Jurong Gateway Rd (Loop) | Boon Lay Way, Toh Guan Rd, Jurong East Ctrl, Bt Batok Ave 1, Bt Batok East Ave 6, Bt Batok East Ave 3, Bt Batok Ctrl and Bt Batok Interchange. |
SMRT Bus Service 991 (since 8 Jul 2018)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2018 (Sep) | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok West Ave 3, Bt Batok West Ave 6, Bt Batok St 11, Bt Batok West Ave 3, Bt Batok West Ave 8, Bt Batok West Ave 5, Brickland Rd, Choa Chu Kang Ave 3, Choa Chu Kang Ave 1, Choa Chu Kang Ave 7, Keat Hong Lk, Choa Chu Kang Gr, Choa Chu Kang Way, Choa Chu Kang Ave 1, Choa Chu Kang Dr, Choa Chu Kang Loop and Choa Chu Kang Interchange. | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Choa Chu Kang Ave 1, Choa Chu Kang Way, Choa Chu Kang Gr, Keat Hong Lk, Choa Chu Kang Ave 7, Choa Chu Kang Ave 1, Choa Chu Kang Ave 3, Brickland Rd, Bt Batok West Ave 5, Bt Batok West Ave 8, Bt Batok West Ave 3, Bt Batok St 11, Bt Batok West Ave 6, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok Interchange. |
| 2018 (Jul) | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok West Ave 3, Bt Batok West Ave 6, Bt Batok St 11, Bt Batok West Ave 3, Bt Batok West Ave 8, Bt Batok West Ave 6, Bt Batok West Ave 9 and Bt Batok West Ave 5 (Loop) | Bt Batok West Ave 8, Bt Batok West Ave 3, Bt Batok St 11, Bt Batok West Ave 6, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok Interchange. |
SMRT Bus Service 991A (since 8 Jul 2018)
| Year | Route (Last Bus: One-Directional) |
| 2018 | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok West Ave 3, Bt Batok West Ave 6, Bt Batok St 11 and Bt Batok West Ave 3 (terminating at Princess E Pr Sch). |
SMRT Bus Service 991B (since 30 Sep 2018)
| Year | Route (Last Bus: One-Directional) |
| 2018 | Choa Chu Kang Interchange, Choa Chu Kang Loop, Choa Chu Kang Ave 4, Choa Chu Kang Dr, Choa Chu Kang Ave 1, Choa Chu Kang Way, Choa Chu Kang Gr, Keat Hong Lk, Choa Chu Kang Ave 7 and Choa Chu Kang Ave 1 (terminating at Opp Choa Chu Kang Mkt). |
SMRT Bus Service 991C (since 26 Oct 2020)
| Year | Route (AM Peak: One-Directional) |
| 2020 | Choa Chu Kang Ave 3, Brickland Rd and Bt Batok West Ave 5 (terminating at Bt Gombak Stn). |
Tower Transit Bus Service 992 (since 24 Sep 2023)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2024 | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok West Ave 3, Bt Batok West Ave 6, Bt Batok West Ave 8, Bt Batok West Ave 5, Bt Batok Rd, Tengah Lk, Plantation Cres, Tengah Blvd, Tengah Gdn Ave, Tengah Gdn Wk, Tengah Dr, Tengah Blvd and Tengah Interchange. | Tengah Interchange, Tengah Blvd, Tengah Dr, Tengah Gdn Wk, Tengah Gdn Ave, Tengah Blvd, Plantation Cres, Tengah Lk, Bt Batok Rd, Bt Batok West Ave 5, Bt Batok West Ave 8, Bt Batok West Ave 6, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok Interchange. |
| 2023 (Dec) | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok West Ave 3, Bt Batok West Ave 6, Bt Batok West Ave 8, Bt Batok West Ave 5, Bt Batok Rd, Tengah Lk, Plantation Cres and Tengah Blvd (Loop) | Tengah Gdn Ave, Plantation Cres, Tengah Lk, Bt Batok Rd, Bt Batok West Ave 5, Bt Batok West Ave 8, Bt Batok West Ave 6, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok Interchange. |
| 2023 (Sep) | Bt Batok Interchange, Bt Batok Ctrl, Bt Batok West Ave 3, Bt Batok West Ave 6, Bt Batok West Ave 8, Bt Batok West Ave 5, Bt Batok Rd, Tengah Lk and Plantation Cres (Loop) | Tengah Lk, Bt Batok Rd, Bt Batok West Ave 5, Bt Batok West Ave 8, Bt Batok West Ave 6, Bt Batok West Ave 3, Bt Batok Ctrl and Bt Batok Interchange. |
SBS Transit Bus Service 993 (since 24 Sep 2023)
| Year | Route | |
| Direction 1 | Direction 2 | |
| 2023 | Jurong East Interchange, Jurong Gateway Rd, Jurong East Ctrl, Boon Lay Way, Jurong Town Hall Rd, Bt Batok Rd, Bt Batok West Ave 3, Bt Batok West Ave 8, Bt Batok West Ave 9, Bt Batok West Ave 6 and Bt Batok West Ave 8 (Loop) | Bt Batok West Ave 2, Bt Batok Rd, Bt Batok West Ave 6, Bt Batok West Ave 9, Bt Batok West Ave 8, Bt Batok West Ave 3, Bt Batok Rd, Jurong Town Hall Rd, Boon Lay Way, Jurong East Ctrl, Jurong Gateway Rd and Jurong East Interchange. |
External Links & References:
- TransitLink Guides 1999 – 2014
- Transitlink eGuide (until Aug 2024)
- SimplyGo eGuide (from Sep 2024)
- SGWiki – History of Bus Services