Route limitations, sometimes called fleet restrictions, usually refer to bus services that have regulations on fleet deployments, such as vehicle length, vehicle height, or various environmental factors. The Land Transport Authority (LTA) may also set restrictions on the buses deployed on certain bus routes by the public bus operators.
Consolidated – Non-Deployment of High Capacity Buses by Bus Services (as of 26 Jan 2025)
1. Non-Deployment of Double-Deck Buses on Operational Bus Services
| Service | Operator | Reason(s) | Effective Date |
| 11 | SBST | Insufficient passenger demand | Since introduction (14 Apr 1990) |
| Narrow lanes along Tg Rhu Rd & Rhu Cross | 8 Jun 2014 | ||
| 14e | SBST | Insufficient passenger demand with occasional deployments | Since introduction (12 Dec 2005) |
| 15 | GAS | Narrow lanes along Joo Chiat Pl & Telok Kurau Rd | 5 Oct 1997 |
| 18 | SBST | Insufficient passenger demand with past permanent deployments | 2004 |
| 24 | SBST | Low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | Since introduction (25 Jun 1983) |
| 26 | SBST | Insufficient passenger demand with past permanent deployments | 2003 |
| 27 | SBST | Low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | Since introduction (24 Jan 1988) |
| 29 | SBST | Narrow lanes along Netheravon Rd & Cranwell Rd | Since 26 Jul 1987 |
| 30e | SBST | Insufficient passenger demand | Since introduction (19 Sep 2005) |
| 32 | SBST | Narrow lanes along Frankel Ave | Since introduction (11 Apr 1971) |
| 33 | SBST | Narrow lanes along Telok Kurau Rd, Joo Chiat Pl & Tembeling Rd | Since introduction (11 Apr 1971) |
| 34 | GAS | Low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | Since introduction (31 Jul 2005) |
| 36 | GAS | Low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | Since introduction (31 Jan 1994, as Service 16E) |
| 38 | SBST | Insufficient passenger demand | Since introduction (7 Apr 2002) |
| 40 | SBST | Narrow lanes along Siglap Rd | 3 May 1992 |
| 42 | SBST | Narrow roads in Kembangan & Siglap estates | Since introduction (5 Nov 1989, as Service M2) |
| 43e | GAS | Insufficient passenger demand | Since introduction (9 Sep 2019) |
| 53 | SBST | Low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | 23 Apr 1995 |
| 53M | Insufficient passenger demand | Since introduction (16 Aug 2015) | |
| 57 | SBST | Narrow lanes along Depot Rd | Since introduction (31 Jul 2005) |
| 63 | SBST | Narrow lanes along Redhill Cl, Redhill Rd & Jln Rumah Tinggi | 23 May 1993 |
| 63M | Insufficient passenger demand | Since introduction (12 Mar 2012) | |
| 73 | SBST | Low headroom under Braddell Flyover | 20 Jun 1983 |
| Narrow lanes along S’goon Nth Ave 3, S’goon Nth Ave 4 & S’goon Nth Ave 5 | 20 Sep 1992 | ||
| 75 | SMRT | Insufficient passenger demand | Since introduction (15 Jun 1981) |
| 77 | TTS | Narrow lanes along Sixth Ave | 1996 |
| 82 | GAS | Insufficient passenger demand | 7 Dec 2003 |
| 92 | SBST | Narrow roads in Mt Sinai estate | Since introduction (11 Sep 1989, as Service M1) |
| Narrow lanes along Science Pk Dr | 17 Jan 1994 (as Service M1) | ||
| 93 | SBST | Insufficient passenger demand with occasional deployments | 2010 |
| 100 | SBST | Narrow lanes along Upp Aljunied Rd | Since introduction (11 Apr 1971) |
| 105 | SBST | Low headroom under Braddell Flyover | 3 May 1992 |
| 110 | SMRT | Low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | Since introduction (22 Oct 2017) |
| 112 | SBST | Narrow lanes along Hougang St 92 | Since introduction (15 Feb 2004) |
| 113 | SBST | Narrow lanes along Hougang St 11 | Since introduction (15 Feb 2004) |
| 115 | SBST | Insufficient passenger demand | Since introduction (30 Oct 2004) |
| 116 | SBST | Narrow lanes along S’goon Nth Ave 3, S’goon Nth Ave 4 & S’goon Nth Ave 5 | Since introduction (18 Nov 2012) |
| 120 | SBST | Narrow lanes along Telok Blangah Hts, Telok Telok Blangah St 32, Telok Blangah Dr & Telok Blangah St 31 | Since introduction (21 Apr 2013) |
| 122 | SBST | Narrow lanes along C’wealth Dr | Since introduction (15 Mar 2015) |
| 123M | SBST | Insufficient passenger demand | Since introduction (28 Jan 2008) |
| 124 | SBST | Narrow lanes along Telok Blangah Hts, Telok Blangah St 31 & Telok Blangah Dr | 23 Nov 2003 |
| 131 | SBST | Narrow lanes along Norfolk Rd, Owen Rd, Dorset Rd & Kent Rd | 3 May 1992 |
| 135 | SBST | Narrow lanes along Upp Aljunied Rd | 19 Apr 1987 |
| Narrow lanes along Telok Kurau Rd, Frankel Ave & Jln Kembangan | 28 Feb 2021 | ||
| 136 | GAS | Insufficient passenger demand | 4 Sep 2016 |
| 137 | SBST | Narrow roads in Kaki Bt Ind Est | Since introduction (21 Oct 2017) |
| 138 | SBST | Narrow junction from Ang Mo Kio Ave 5 to Yio Chu Kang Rd | Since introduction (26 Apr 1994) |
| Narrow lanes along Mandai Rd | |||
| 140 | SBST | Narrow roads in St. George’s Est | Since introduction (14 Dec 2014) |
| 141 | SBST | Narrow lanes along Norfolk Rd, Owen Rd & Kent Rd | Since introduction (9 Jun 2013) |
| 142 | SBST | Narrow roads in Potong Pasir Est | Since introduction (25 Nov 1984) |
| 146 | SBST | Insufficient passenger demand | Since introduction (25 Feb 2024) |
| 150 | SBST | Narrow lanes along Joo Chiat Pl & Telok Kurau Rd | Since introduction (20 Mar 2016) |
| 155 | SBST | Narrow lanes along Upp Aljunied Rd | Since introduction (11 Apr 1971) |
| Narrow lanes along Joo Chiat Pl & Telok Kurau Rd | |||
| 156 | SBST | Narrow lanes along Sixth Ave | Since introduction (5 Dec 1993) |
| 158 | SBST | Narrow lanes along S’goon Ave 1 | 4 Feb 1990 |
| Narrow lanes along Tg Rhu Rd & Rhu Cross | 3 May 1992 | ||
| 159 | SBST | Low headroom under Braddell Flyover | 20 Jun 1983 |
| Narrow lanes along S’goon Nth Ave 5 & S’goon Nth Ave 6 | 18 Feb 2001 | ||
| 160 | SBST | Low headroom in W’lands & Johor Bahru Checkpts & narrow roads in Johor Bahru | Since introduction (5 Sep 2004) |
| 162 | SBST | Insufficient passenger demand | Since introduction (25 Feb 2001) |
| 167 | TTS | Insufficient passenger demand with occasional deployments | 17 Dec 2023 |
| 170 | SBST | Low headroom in W’lands & Johor Bahru Checkpts & narrow roads in Johor Bahru | Since introduction (11 Apr 1971) |
| 170X | Since introduction (10 Nov 2003) | ||
| 173 | TTS | Narrow roads in Princess Elizabeth Est | Since introduction (11 Apr 1971) |
| Narrow lanes along Bt Batok St 21 | 3 May 1992 | ||
| 174e | SBST | Insufficient passenger demand with occasional deployments | Since introduction (28 Mar 2005) |
| 175 | SBST | Narrow lanes along Depot Rd | Since introduction (11 Mar 2007) |
| 177 | TTS | Narrow lanes along Gombak Dr & within MINDEF CP | Since introduction (26 Apr 1989) |
| 188e | SMRT | Insufficient passenger demand | 1 Sep 2016 |
| 191 | SBST | Narrow lanes along Portsdown Rd | Since introduction (29 May 1988) |
| 194 | SBST | Insufficient passenger demand with occasional deployments until closure of Jurong Bird Pk | 3 Jan 2023 |
| 195 | SBST | Narrow lanes along Depot Rd | 18 Dec 1988 |
| Narrow lanes along C’wealth Dr | |||
| 196e | SBST | Insufficient passenger demand | Since introduction (12 Dec 2005) |
| 200 | SBST | Narrow lanes along Sth Buona Vista Rd | Since introduction (11 Apr 1971) |
| 228 | SBST | Insufficient passenger demand with past occasional deployment | Since introduction (15 Sep 1980) |
| 229 | SBST | Insufficient passenger demand | Since introduction (15 Sep 1985, as Service 219) |
| 230 | SBST | Narrow lanes along Toa Payoh East & Kim Keat Ave | Since introduction (24 Sep 2023) |
| Narrow lanes along Lor 8 Toa Payoh | 26 Jan 2025 | ||
| Narrow lanes along Lor 7 Toa Payoh | |||
| 231 | SBST | Narrow lanes along Lor 5 Toa Payoh | 11 Mar 2012 |
| 232 | SBST | Narrow lanes along Toa Payoh East & Lor 7 Toa Payoh | 19 May 2002 |
| 235 | SBST | Narrow lanes along Lor 5 Toa Payoh | Since introduction (26 Dec 1983) |
| Narrow lanes along Lor 3 Toa Payoh | |||
| Narrow lanes along Toa Payoh East | 31 Jan 2010 | ||
| 238 | SBST | Narrow lanes along Toa Payoh East & Lor 8 Toa Payoh | Since introduction (26 Dec 1983) |
| 240M | SMRT | Insufficient passenger demand with occasional deployments | Since introduction (1 Sep 2016) |
| 261 | SBST | Narrow lanes along Ang Mo Kio Ind Pk 1 | 5 Jul 1981 |
| 262 | SBST | Narrow lanes along Ang Mo Kio St 11 | Sep 1985 |
| 265 | SBST | Narrow junction from Ang Mo Kio Ave 5 to Yio Chu Kang Rd | 24 Mar 2002 |
| Narrow lanes along Ang Mo Kio St 11 | |||
| 268 | SBST | Narrow lanes along Ang Mo Kio Ind Pk 2 (West) | Since introduction (30 Mar 1980, as Service 263) |
| Narrow lanes along Ang Mo Kio Ind Pk 2 (East) | 24 Mar 2002 | ||
| 269 | SBST | Narrow junction from Yio Chu Kang Rd to Ang Mo Kio Ave 5 | 17 Nov 2002 |
| 272 | SBST | Insufficient passenger demand | Since introduction (28 Sep 1980) |
| 273 | SBST | Narrow lanes along Telok Blangah Hts, Telok Blangah St 32 & Telok Blangah Dr | Since introduction (28 Sep 1980) |
| 282 | TTS | Insufficient passenger demand with occasional deployments | Since introduction (23 Dec 1979) |
| 284 | TTS | Narrow cul-de-sac along Clementi Ave 4 | Since introduction (16 Jul 1979) |
| 292 | SBST | Narrow lanes along Tampines St 22 | Since introduction (20 Feb 1983) |
| Narrow lanes along Tampines St 11 | 19 Jun 1988 | ||
| 296 | SBST | Narrow lanes along Tampines Nth Dr 2 | Since introduction (28 Apr 2024) |
| 298 | SBST | Narrow lanes along Tampines St 82, Tampines St 85 & Tampines St 86 | Since introduction (21 Oct 2017) |
| 298X | Narrow lanes along Tampines St 85 & Tampines St 86 | Since introduction (9 Dec 2024) | |
| 307 | SMRT | Narrow lanes along Choa Chu Kang Ctrl & Teck Whye Lane | 31 Oct 2001 |
| 315 | SBST | Narrow lanes along S’goon Nth Ave 3 & S’goon Nth Ave 4 | 11 Jun 1995 |
| Narrow lanes along S’goon Nth Ave 5 | 30 Jan 2011 | ||
| 317 | SBST | Narrow lanes in S’goon Gdn Est | Since introduction (31 Oct 1977) |
| 325 | SBST | Insufficient passenger demand | Since introduction (8 Jan 1995) |
| 329 | SBST | Insufficient passenger demand | Since introduction (9 Jul 2017) |
| 354 | GAS | Narrow lanes along Pasir Ris Cl | Since introduction (2 Feb 1997) |
| Narrow lanes along Jln Loyang Besar | 25 Apr 2010 | ||
| 358 | GAS | Narrow lanes along Pasir Ris St 41 | Since introduction (2 Feb 1997) |
| 359 | GAS | Narrow lanes along Pasir Ris St 71 | Since introduction (23 Feb 1997) |
| Narrow lanes along Pasir Ris St 51 | 6 Sep 1998 | ||
| 371 | SBST | Narrow lanes along Rivervale Cres | Since introduction (19 Jan 2014) |
| 372 | SBST | Insufficient passenger demand | Since introduction (22 Dec 2000) |
| 374 | SBST | Insufficient passenger demand | Since introduction (12 Mar 2017) |
| 381 | GAS | Insufficient passenger demand | Since introduction (12 Mar 2017) |
| 384 | GAS | Insufficient passenger demand | Since introduction (27 Dec 2020) |
| 386 | GAS | Insufficient passenger demand with past permanent deployments | 1 Jan 2024 |
| 400 | SBST | Insufficient passenger demand with past permanent deployments | 5 May 2024 |
| 401 | SBST | Narrow lanes along East Coast Pk Svc Rd | Since introduction (24 Oct 1976) |
| Narrow lanes along Siglap Rd | 21 Sep 1997 | ||
| 403 | GAS | Narrow lanes along Elias Rd & Pasir Ris Rd | Since introduction (3 Apr 1977) |
| 405 | SBST | Narrow lanes along Old Choa Chu Kang Rd | Since introduction (18 Jul 1993) |
| 410G | SBST | Narrow lanes along Bishan St 12 (westbound) | Since introduction (3 May 1992) |
| 666 | GAS | Insufficient passenger demand | Since PTO takeover (2 Mar 2020) |
| 667 | SBST | Narrow cul-de-sac along Clementi Ave 4 | Since PTO takeover (9 Mar 2020) |
| 668 | SBST | Insufficient passenger demand | Since PTO takeover (14 Dec 2020) |
| 673 | GAS | Insufficient passenger demand | Since introduction (14 Oct 2024) |
| 675 | SBST | Insufficient passenger demand | Since introduction (2 Jan 2025) |
| 676 | SBST | Insufficient passenger demand | Since introduction (2 Jan 2025) |
| 677 | SBST | Insufficient passenger demand | Since introduction (2 Jan 2025) |
| 678 | GAS | Insufficient passenger demand | Since introduction (2 Jan 2025) |
| 803 | SBST | Insufficient passenger demand | Since introduction (16 Feb 2014) |
| 805 | SBST | Insufficient passenger demand | Since introduction (14 Feb 2016) |
| 825 | TTS | Narrow lanes in Lentor estate | Since introduction (17 Aug 1988) |
| 852 | SBST | Insufficient passenger demand | Since introduction (8 Dec 1985) |
| 858 | TTS | Full route deployment not permitted due to low headroom in Changi Airport Passenger Terminal Buildings (PTBs) 1, 2 & 3 | 2 Nov 1997 |
| 860 | SBST | Narrow junction from Ang Mo Kio Ave 5 to Yio Chu Kang Rd | 15 Oct 2017 |
| 861 | TTS | Insufficient passenger demand with occasional deployments | Since introduction (15 Sep 2024) |
| 871 | TTS | Narrow lanes along Bt Batok St 52 | Since introduction (21 Jul 2024) |
| 902 | SMRT | Insufficient passenger demand | Since introduction (17 Apr 2006) |
| 904 | SMRT | Insufficient passenger demand | Since introduction (18 Aug 2013) |
| 913M | SMRT | Narrow lanes along W’lands St 32 | Since introduction (17 Mar 2019) |
| 920 | SMRT | Insufficient passenger demand with past permanent deploymens | 2020 |
| 925 | SMRT | Narrow 3-point turn at Kranji Resvr CP B | Since introduction (7 Apr 1986) |
| 927 | SMRT | Insufficient passenger demand | Since introduction (9 Apr 1995) |
| 945 | TTS | Narrow lanes along Bt Batok St 52 | Since introduction (6 Apr 1986, as Service 365) |
| 950 | SMRT | Low headroom in W’lands & Johor Bahru Checkpts & narrow roads in Johor Bahru | Since introduction (19 Sep 2004) |
| 967 | SMRT | Insufficient passenger demand | Since introduction (12 Jan 2025) |
| 970 | SMRT | Narrow lanes along Sixth Ave | Since introduction (20 Aug 2000) |
| 973 | SMRT | Narrow lanes along Dairy Farm Rd | Since introduction (26 Feb 2017) |
| 976 | SMRT | Narrow junction from Segar Rd to Bt Panjang Ring Rd | Since introduction (10 Nov 2019) |
| 983M | SMRT | Insufficient passenger demand | Since introduction (18 Mar 2024) |
| 993 | SBST | Insufficient passenger demand | Since introduction (26 Jul 2020, as Service 160M) |
2. Non-Deployment of Articulated Buses on Operational Bus Services*
*Bus services managed by the following depots will be excluded, as there are currently no articulated buses within their fleets:
- SBST Bedok North Depot (BNDEP)
- SBST Bukit Batok Depot (BBDEP)
- SBST Hougang Depot (HGDEP)
- SBST Sengkang West Depot (SWDEP)
- SBST Ulu Pandan Depot (UPDEP)
- SMRT Soon Lee Depot (SLDEP)
- TTS Bulim Depot (BUDEP)
- GAS Loyang Depot (LYDEP)
| Service | Operator | Reason(s) | Effective Date |
| 13 | SBST | Service not under Seletar Bus Package | 4 Jan 2025 |
| 24 | SBST | Long distance trunk route | 11 Mar 2018 |
| 45 | SBST | Service not under Seletar Bus Package | 4 Jan 2025 |
| 61 | SMRT (KJ) | Long distance trunk route with past permanent deployments | 17 Nov 2014 |
| 67 | SMRT (KJ/WL) | Long distance trunk route with past permanent deployments | 15 Feb 2015 |
| 70 | SBST | Long distance trunk route | 18 Mar 2018 |
| 70M | SBST | Long distance trunk route | 18 Mar 2018 |
| 71 | SBST | Short distance trunk route | 18 Mar 2018 |
| 72 | SBST | Service not under Seletar Bus Package | 4 Jan 2025 |
| 75 | SMRT (KJ/WL) | Insufficient passenger demand | 6 Aug 1995 |
| 76 | SBST | Long distance trunk route | 11 Mar 2018 |
| 110 | SMRT (WL) | Insufficient passenger demand | Since introduction (22 Oct 2017) |
| 130 | SBST | Long distance trunk route | 18 Mar 2018 |
| 133 | SBST | Long distance trunk route | 18 Mar 2018 |
| 135 | SBST | Narrow lanes along Upp Aljunied Rd | 18 Mar 2018 |
| Narrow lanes along Telok Kurau Rd, Frankel Ave & Jln Kembangan | 28 Feb 2021 | ||
| 138 | SBST | Narrow lanes along Mandai Rd & Mandai Lake Rd | 18 Mar 2018 |
| 162 | SBST | Insufficient passenger demand | 18 Mar 2018 |
| 167 | TTS | Insufficient passenger demand | 3 Apr 1983 |
| 168 | SBST | Service not under Seletar Bus Package | 4 Jan 2025 |
| 169 | TTS | Long distance trunk route with occasional deployments | 1 Oct 2014 |
| 171 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | 12 Aug 2018 |
| 172 | SMRT (KJ) | Long distance trunk route | 14 Jul 2015 |
| 176 | SMRT (KJ) | Long distance trunk route & insufficient space in Bukit Panjang Bus Interchange | 17 Nov 2014 |
| 178 | SMRT (KJ/WL) | Long distance trunk route with past occasional deployments | 10 Jul 1983 |
| 187 | SMRT (KJ/WL) | Long distance trunk route with past permanent deployments | 12 Jan 2015 |
| 188 | SMRT (KJ) | Long distance trunk route with past permanent deployments | 15 Sep 2014 |
| 188e | SMRT (KJ) | Insufficient passenger demand | 15 Sep 2014 |
| 190 | SMRT (KJ) | Long distance trunk route with occasional deployments | 18 Aug 2014 |
| 261 | SBST | Narrow lanes along Ang Mo Kio Ind Pk 1 | 18 Mar 2018 |
| 262 | SBST | Narrow lanes along Ang Mo Kio St 11 | 18 Mar 2018 |
| 265 | SBST | Narrow lanes along Ang Mo Kio St 11, Ang Mo Kio St 52, Ang Mo Kio St 53 & Ang Mo Kio St 54 | 18 Mar 2018 |
| 268 | SBST | Narrow lanes along Ang Mo Kio Ind Pk 2 | 18 Mar 2018 |
| 269 | SBST | Narrow lanes along Ang Mo Kio St 61 | 18 Mar 2018 |
| 300 | SMRT (KJ) | Narrow lanes along Choa Chu Kang Ave 3 due to temporary road diversion due to construction works for Jurong Region Line (JRL) | 18 Mar 2024 |
| 307 | SMRT (KJ) | Narrow lanes along Choa Chu Kang Ctrl & Teck Whye Lane | 31 Oct 2001 |
| 652 | SBST | Long distance City Direct route | Since PTO takeover (6 Jan 2020) |
| 665 | SMRT (WL) | Long distance City Direct route | 31 May 2021 |
| 668 | SBST | Narrow lanes along Ang Mo Kio St 52 & Ang Mo Kio St 53 | Since introduction (15 Mar 2016) |
| 800 | SBST | Insufficient passenger demand with past permanent deployments | 19 Jan 2025 |
| 801 | TTS | Insufficient passenger demand | Since introduction (23 Jan 2022) |
| 803 | SBST | Insufficient passenger demand | Since introduction (16 Feb 2014) |
| 805 | SBST | Insufficient passenger demand | Since introduction (14 Feb 2016) |
| 812 | SBST | Insufficient passenger demand with past permanent deployments | 25 Mar 2018 |
| 825 | TTS | Narrow roads in Lentor estate | Since introduction (17 Aug 1988) |
| 850E | SBST | Long distance Express route | Since introduction (18 Feb 2013) |
| 851 | SBST | Long distance trunk route with past permanent deployments | 25 Mar 2018 |
| 851e | SBST | Long distance Express route | Since introduction (27 May 2018) |
| 852 | SBST | Insufficient passenger demand | Since introduction (8 Dec 1985) |
| 853 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | 8 Sep 2019 |
| 853M | |||
| 854 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | 16 Aug 2015 |
| 854e | TTS | Long distance Express route & insufficient space in Yishun Bus Interchange | 16 Aug 2015 |
| 855 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | Since introduction (1 Oct 1989) |
| 856 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | 18 May 2015 |
| 857 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | 26 Apr 2015 |
| 859 | TTS | Long distance trunk route & insufficient space in Yishun Bus Interchange | 23 Dec 2018 |
| 859A | Insufficient passenger demand with past occasional deployments | Since introduction (17 Aug 2014) | |
| 859B | |||
| 860 | SBST | Insufficient passenger demand | 15 Oct 2017 |
| 861 | TTS | Insufficient passenger demand | Since introduction (15 Sep 2024) |
| 882 | TTS | Narrow turning point at Sembawang Pk | Since introduction (20 Nov 2005) |
| 883 | TTS | Short distance trunk route | Since introduction (23 Oct 2016) |
| 883M | Insufficient passenger demand | Since introduction (12 Jan 2020) | |
| 900 | SMRT (WL) | Occasional deployments | 10 Apr 2018 |
| 901 | SMRT (WL) | Occasional deployments | 23 Apr 2018 |
| 901M | SMRT (WL) | Occasional deployments | Since introduction (23 Jun 2019) |
| 902 | SMRT (WL) | Insufficient passenger demand | 31 Jan 2020 |
| 903 | SMRT (WL) | Occasional deployments | 23 Apr 2018 |
| 903M | |||
| 904 | SMRT (WL) | Insufficient passenger demand with past occasional deployments | Since introduction (18 Aug 2013) |
| 913M | SMRT (WL) | Narrow lanes along W’lands St 32 | Since introduction (17 Mar 2019) |
| 920 | SMRT (KJ) | Insufficient passenger demand | Since introduction (26 Mar 2000) |
| 922 | SMRT (KJ) | Insufficient space in Bukit Panjang Bus Interchange | 4 Sep 2017 |
| 925 | SMRT (WL) | Insufficient passenger demand | Since introduction (7 Apr 1986) |
| 925M | SMRT (WL) | Short distance trunk route | Since introduction (6 Apr 1986) |
| 927 | SMRT (KJ) | Insufficient passenger demand with past occasional deployment | Since introduction (9 Apr 1995) |
| 950 | SMRT (WL) | Vehicle length limits in W’lands & Johor Bahru Checkpts & narrow roads in Johor Bahru | Since introduction (19 Sep 2004) |
| 951E | SMRT (WL) | Long distance Express route | Since introduction (17 Jun 2013) |
| 960 | SMRT (WL) | Long distance trunk route with past permanent deployments | 16 Feb 2015 |
| 960e | SMRT (WL) | Long distance Express route | Since introduction (28 Oct 2018) |
| 961 | SMRT (WL) | Long distance trunk route with past occasional deployments | Since introduction (27 Dec 1998) |
| 961M | Since introduction (27 Dec 1998, as Service 961#) | ||
| 962 | SMRT (WL) | Short distance trunk route with past permanent deployments | 10 Sep 2017 |
| 963 | TTS | Long distance trunk route | 15 Sep 2014 |
| 963e | TTS | Long distance Express route | 15 Sep 2014 |
| 964 | SMRT (WL) | Short distance trunk route with past permanent deployments | 12 Jan 2015 |
| 965 | TTS | Long distance trunk route with occasional deployments | Since introduction (7 Jul 2002) |
| 966 | TTS | Long distance trunk route with past occasional deployments | Since introduction (16 Nov 2003) |
| 967 | SMRT (WL) | Insufficient passenger demand | Since introduction (12 Jan 2025) |
| 969 | TTS | Long distance trunk route with occasional deployments | 18 Aug 2014 |
| 970 | SMRT (KJ) | Narrow lanes along Sixth Ave | Since introduction (20 Aug 2000) |
| 972 | SMRT (KJ) | Long distance trunk route with past occasional deployments | Since introduction (17 Nov 2013) |
| 972M | Long distance trunk route | Since introduction (30 Aug 2020) | |
| 973 | SMRT (KJ) | Insufficient passenger demand | Since introduction (26 Feb 2017) |
| 975 | SMRT (KJ) | Narrow turning point at Lim Chu Kang Rd End | Since introduction (27 Feb 2005) |
| 976 | SMRT (KJ) | Insufficient passenger demand | Since introduction (10 Nov 2019) |
| 979 | SMRT (KJ) | Short distance trunk route with past occasional deployments | Since introduction (27 Dec 2015) |
| 980 | TTS | Long distance trunk route | 22 Apr 2018 |
| 981 | TTS | Short distance trunk route | Since introduction (9 Nov 1999) |
| 982E | SMRT (KJ) | Long distance Express route | Since introduction (18 Mar 2013) |
| 983 | SMRT (KJ) | Short distance trunk route | Since introduction (25 Apr 2015) |
| 983M | Insufficient passenger demand | Since introduction (18 Mar 2024) | |
| 985 | SMRT (KJ/WL) | Long distance trunk route with past occasional deployments | Since introduction (27 Jul 2003) |
| 991 | SMRT (KJ) | Short distance trunk route | Since introduction (8 Jul 2018) |
Physical Limitations
Bus routes in Singapore are subject to physical limitations of road infrastructure. Some roads have various design limitations that would be difficult or impossible for larger buses to pass through. Hence, for safety reasons, fleet restrictions are put in place to forbid certain models of buses from being deployed on routes with limitations.
The following list is not exhaustive; nor does it reflect the most up-to-date restrictions in place, as bus operators are at liberty to add or remove such restrictions. More details are in the Disclaimer section below.
| Confirmed Fleet Restrictions | |||
| Operator | Service(s) | Fleet Restriction | Reason(s) |
| Central Region | |||
| SBST | 63, 63A | Only single-deck buses allowed | Narrow lanes along Jln Rumah Tinggi |
| SBST | 73, 73T, 105, 159 | Only single-deck buses allowed | Low headroom under Braddell Flyover |
| SBST | 120, 124, 273, |
Only single-deck buses allowed | Narrow roads & roundabout in Telok Blangah Heights Estate |
| SBST | 131, 131A, 141 | Only single-deck buses allowed | Narrow roads within Pek Kio Estate |
| SBST | 142, 142A | Only single-deck buses allowed | Narrow roads within Potong Pasir Estate |
| SBST | 230 | Only single-deck buses allowed | Narrow lanes along Kim Keat Ave |
| SBST | 230, 232 | Only single-deck buses allowed | Narrow lanes along Lor 7 Toa Payoh |
| SBST | 230, 238, |
Only single-deck buses allowed | Narrow lanes along Lor 8 Toa Payoh |
| SBST | 231, 235 | Only single-deck buses allowed | Narrow lanes along Lor 5 Toa Payoh |
| Eastern Region | |||
| SBST |
11, 158, 158A | Only single-deck buses allowed | Narrow lanes along Tg Rhu Rd and Rhu Cross |
| GAS / SBST | 15, 33, 33B, 135, 150, 155 | Only single-deck buses allowed | Narrow roads within Joo Chiat Estate |
| SBST / SMRT / TTS / GAS | 24, 27, 34, 34B, 36, 36A, 53, 53A, 110, 858, 858B | Only single-deck and articulated buses allowed | Low headroom at Changi Airport Terminals 1/2/3 Basement |
| SBST |
29 | Only single-deck buses allowed | Narrow lanes along Cranwell Rd and Netheravon Rd |
| SBST | 32, 40, 42, 135, 401 | Only single-deck buses allowed | Narrow roads & U-turns within Kembangan / Siglap Estates |
| SBST | 140 | Only single-deck buses allowed | Narrow lanes & U-turn along St. George’s Rd and St. Wilfred Rd |
| GAS |
354 | Only single-deck buses allowed | Narrow lanes & 3-point turn along Jln Loyang Besar |
| GAS | 358 | Only single-deck buses allowed | Narrow lanes along Pasir Ris St 41 |
| SBST | 401 | Only single-deck buses allowed | Narrow lanes along East Coast Pk Svc Rd |
| GAS | 403 | Only single-deck buses allowed | Narrow lanes & 3-point turn along Elias Rd (between Pasir Ris Dr 3 & Pasir Ris Rd) and Pasir Ris Rd |
| Northern Region | |||
| SBST / SMRT | 138, 138A, |
Only single-deck and articulated buses allowed | Narrow lanes along Mandai Lake Rd |
| SBST, SMRT | 160, 170, 170X, 950 | Only SPAD-registered single-deck buses are allowed to operate in Malaysia | Low headroom in Woodlands & Johor Bahru Checkpoints and fleet restrictions by APAD |
| SBST | 261 | Only single-deck buses allowed | Narrow lanes along Ang Mo Kio Ind Pk 1 |
| SBST | 268, 268A | Only single-deck buses allowed | Narrow lanes along Ang Mo Kio Ind Pk 2 |
| SMRT | 300 | Only single-deck and double-deck buses allowed | Jurong Region Line (JRL) construction works |
| TTS | Only minibuses and single-deck buses allowed | Narrow roads & U-turn within Lentor Estate | |
| SMRT | 925, 925A | Only single-deck buses allowed | Narrow U-turn point in Kranji Resvr CP B |
| SMRT |
975, 975C | Only single-deck and double-deck buses allowed | Narrow U-turn point along Lim Chu Kang Road End |
| SMRT | 976 | Only single-deck buses allowed | Tight left-hand turn from Segar Rd to Bt Panjang Ring Rd; Double-deck and articulated buses risk sideswiping middle lane vehicles |
| North-Eastern Region | |||
| SBST | 317 | Only single-deck buses allowed | Narrow roads within Serangoon Gardens Estate |
| Western Region | |||
| SBST | 92, |
Only single-deck buses allowed | Narrow roads within Mt Sinai Estate |
| SBST | 122, 195, 195A | Only single-deck buses allowed | Narrow lanes along Commonwealth Dr (northern ring) |
| TTS | 173 | Only single-deck buses allowed | Narrow roads within Elizabeth / Toh Tuck Estates |
| TTS | 177 | Only single-deck buses allowed | Narrow roads along Gombak Dr and within MINDEF CP |
| SBST |
191 | Only single-deck buses allowed | Narrow lanes along Portsdown Rd and Media Circle |
| SBST | 200, 200A | Only single-deck buses allowed | Narrow lanes along Sth Buona Vista Rd |
| SBST / TTS |
284, |
Only single-deck buses allowed | Narrow cul-de-sac along Clementi Ave 4 |
| SMRT | 405 | Only single-deck buses allowed | Narrow lanes and U-turn point along Old Choa Chu Kang Rd End |
| TTS | 871, 945 | Only single-deck buses allowed | Narrow lanes along Bt Batok East Ave 5 and Bt Batok St 52 |
| TTS | 945 | Only single-deck buses allowed | Narrow lanes along Bt Batok St 32, Bt Batok St 33 and Bt Batok St 34 |
Unconfirmed Fleet Restrictions
The so-called ‘ban’ on various types of buses on certain bus services is subject to debate. Since fleet restrictions are part of the internal affairs of the LTA and are not publicly disclosed, it is difficult to know for sure whether a ‘ban’ exists. For example, areas like Depot Road and Upper Aljunied Road do not see the use of double-deck buses and articulated buses respectively. It is hard to know for sure whether the ‘ban’ will be lifted, as the exclusive deployment of single-deck rigid buses to various bus services plying these areas may be due to other factors (such as a lack of strong demand). As such, most fleet restrictions are ‘speculated’ based on the operating trends of various bus services.
For feeder bus routes, most routes use single-deck buses exclusively, likely due to the fact that most commuters travel short distances on these bus services. Double-deck buses are slower at loading and unloading large numbers of passengers quickly. Thus, it is more difficult to determine if high capacity double-deck and articulated buses are not deployed on feeder services due to actual route limitations or their short distances.
Prior to the full retirement of older public buses without wheelchair-friendly facilities in 2020, a wheelchair-accessible bus quota for wheelchair-accessible bus routes (WAB) state that a WAB route must operate with a fleet of at least 50% wheelchair-accessible buses, so wheelchair-bound passengers can get a WAB within the waiting time of two buses. Another unique fleet restriction is the cross-border fleet restriction, which demands that all buses serving on cross-border routes have to be registered with Malaysia’s Land Public Transport Commission or SPAD. These buses are retrofitted with a third brake light and carry additional documents/labels in order to meet Malaysian traffic regulations (3rd brake light is not compulsory in Singapore). These SPAD-registered buses can serve on any bus route in Singapore, but only SPAD-registered buses can be deployed on cross-border routes.
| Operator | Service(s) | Fleet Restrictions | Reasons |
| Central Region | |||
| SBST | 57, 175, 195, 195A, |
Only single-decker buses allowed | Narrow lanes along Depot Rd |
| Eastern Region | |||
| SBST | 137 | Only single-decker buses allowed | Narrow roads within Kaki Bukit Industrial Estate |
| Northern Region | |||
| SBST |
410G, |
Only single-decker buses allowed | Narrow lanes along Bishan St 12 |
| North-East Region | |||
| SBST | 73, 73T, 116, 116A, 315, 599 | Only single-decker buses allowed | Narrow lanes along S’goon Nth Ave 4 |
| SBST | 100, 100A, 135, 155, |
Only single-decker buses allowed | Narrow lanes along Upp Aljunied Rd |
| GAS |
381 | Only single-decker buses allowed | Narrow roads & U-turn along Punggol East End |
| Western Region | |||
| SBST | 32, 122 | Only single-decker buses allowed | Narrow lanes along Margaret Dr |
| SBST | 92 | Only single-decker buses allowed | Narrow roads & U-turn along Science Park Dr |
| SBST / SMRT / TTS | 77, 156, 970 | Only single-decker buses allowed | Narrow lanes along Sixth Ave |
Deployment Restrictions for Articulated Buses
With the retirement of the older Mercedes-Benz O405G articulated buses in favour of more double-deck buses by the LTA, unofficial restrictions have been imposed by the LTA on the deployment of the newer MAN A24 articulated buses currently in operation that were transferred to SBS Transit and Tower Transit under the Bus Contracting Model (BCM) in 2018 and 2021.
| Operator | Depot(s) | Restrictions |
| SBST | Seletar Depot (SEDEP) | Officially deployed on feeder bus services in Yishun only (800, 804, 806, 807, 807A, 807B, 811, 811A), with past occurrences on Service 812 |
| TTS | Mandai Depot (MDDEP) | Officially deployed on Service 858 only, with past occurrences on Services 169 & 969 |
Unofficial Deployment Restrictions on Airport Bus Services (Oct 2017 – Sep 2021)
In Oct 2017, unofficial restrictions were imposed by the LTA on the bus models deployed on bus services serving Changi Airport. The new restriction required buses deployed on airport bus services to be retrofitted with an internal announcement system.
At the time, only Mercedes-Benz Citaro buses were fitted with such announcement systems. Massive redeployments were made for Bus Services 27, 53 and 858, swapping out the remaining Scania K230UB and MAN A22 (Euro 5) buses for Mercedes-Benz Citaro buses. Bus Services 24, 34 & 36 were already operating a full fleet of Mercedes-Benz Citaro buses under their respective BCM route packages, while Bus Service 110 was launched with a full fleet of Mercedes-Benz Citaro buses in Oct 2017.
Buses procured by LTA since 2018 are retrofitted with announcement systems, which eventually reduced the need for such a restriction on bus deployments for airport bus services.
In Sep 2021, Tower Transit took over the operation of Bus Service 858 under the Mandai Bus Package, operating a fleet of MAN A22 (Euro 5) buses without such announcement systems. Therefore, this indicated the unofficial discontinuation of fleet restrictions on airport bus services by the LTA.
Former Fleet Restrictions on Bus Services
The following defunct bus services operated with no double-deck or articulated buses due to the following route limitations. Non-deployment of high capacity buses on bus services due to insufficient passenger demand are excluded from the table below.
| Operator | Service(s) | Fleet Restrictions | Reasons |
| SBST, SMRT | 39, 85, 171, 800, 804, 806, 811, 811A, 812, 851, 853, 854, 854E, 855, 856, 857, 859 | Only single-decker and articulated buses allowed | Low headroom in former Yishun Bus Interchange. Restrictions removed when the interchange was relocated in 2015. |
| SBST, SMRT | 48, (66), 67, (171), |
Only single-decker and articulated buses allowed | Low headroom along Dunearn Rd / Bt Timah Rd due to low hanging tree branches. Restrictions removed after tree pruning in 2014. |
| SBST | (103) | Only single-decker buses allowed | Narrow lanes and U-turns along Piccadilly. Restrictions removed after road widening in 2015. |
| SBST / SMRT | 145, 176 | Only single-decker buses allowed | Low headroom along Henderson Road due to low hanging tree branches. Restrictions removed after tree pruning in 2014. |
| SMRT | 176, 653, 963, 963e | Only single-decker and articulated buses allowed | Low headroom along Hillview Rd due to former KTM railway overhead bridge. Restrictions removed after removal of overhead bridge in 2012. |
| SMRT | Only single-decker and double-decker buses allowed | Narrow roads in RWS Car Park for articulated buses. | |
| GAS |
386 | Only single-decker buses allowed | Narrow U-turn points. along Edgefield Plains and Edgedale Plains. Restrictions removed after the opening of Punggol Nth Ave in 2023. |
| SMRT | 920 | Only single-decker and articulated buses allowed | Low headroom along Saujana Rd due to low hanging tree branches. Restrictions removed after tree pruning in 2018. |
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