The NUS Internal Shuttle Bus (ISB) network serves the National University of Singapore (NUS)’s Kent Ridge Campus.
These shuttle buses are overseen by the University Campus Infrastructure. The shuttle bus service is contracted to private bus operator ComfortDelGro Bus Pte Ltd. The company owns, operates and maintains the fleet of buses, and manages the bus drivers.
Network Map
Routes:
| Service | Route | Operating Hours |
| A1 | Kent Ridge Ter ↺ Prince George’s Park / Lower Kent Ridge Cres (Loop, Anti-clockwise) |
Daily; full-day |
| A2 | Kent Ridge Ter ↺ Kent Ridge Cres / Prince George’s Park (Loop, Clockwise) |
Daily; full-day |
| D1 | NUS COM 3 ↺ University Town (Loop via Kent Ridge Cres) |
Daily; full-day |
| D2 | NUS COM 3 ↺ University Town (Loop via Kent Ridge MRT) |
Daily; full-day |
| K | Prince George’s Park ↺ University Town (Loop) | Weekdays & Saturdays; Full-day |
| P | Kent Vale ↺ NUS Bukit Timah Campus (Oei Tiong Ham Bldg) via Botanic Gardens MRT, Kent Ridge MRT & University Town |
Weekdays; Day-time |
| R1 | Kent Vale → Prince George’s Park via University Town |
Weekdays; Day-time |
| R2 | Prince George’s Park → Kent Vale via University Town |
Weekdays; Day-time |
Withdrawn Routes:
COVID-19 Service Arrangements (20 Jul 2020 — 5 Dec 2020):
| NUS AA1 | Prince George’s Park Terminal ↺ Kent Vale via Central Lib (Loop) |
| NUS AA2 | Prince George’s Park Terminal ↺ Kent Vale via UTown (Loop) |
| NUS BB | Prince George’s Park Terminal ↺ University Town (Loop) |
| NUS CC | Opp Kent Ridge Stn Exit A ↺ UTown via COM2 (Loop) |
| NUS CCX | Opp Kent Ridge Stn Exit A ↺ UTown (Express) |
| NUS DD | NUS Bukit Timah Campus (Oei Tiong Ham Bldg) ↔ Kent Vale |
During NUS’ AY2020/21 Semester 1 amid the COVID-19 pandemic, the ISB network was modified in line with NUS’ zoning strategy which minimised intermingling of students and staff across zones. Routes were amended such that each zone had a direct ISB service to Kent Ridge MRT station and other shared amenities within designated neutral zones (e.g. school accommodation, studios, sports facilities and student support facilities) subject to access restrictions.
Other Withdrawn Routes:
| Service | Route | Remarks |
| A1E | Lower Kent Ridge Road (Kent Ridge MRT) → Prince George’s Park | |
| A2E | Kent Ridge Drive (Ventus / Opp LT13) ↺ Lower Kent Ridge Road (Opp Kent Ridge MRT) | |
| B1 | Kent Ridge Ter ⟶ NUS School of Business (via UTown) | |
| B2 | NUS School of Business ⟶ Kent Ridge Ter (via UTown) | |
| C | Kent Ridge Ter ↺ NUS Faculty of Science (Loop) | |
| UT-CLB | University Town ↔ Central Library | |
| UT-FOS | University Town ↔ Faculty of Science | Replaced by 2018 amendment to NUS C |
| P1 | Kent Ridge MRT ↺ University Town (Loop) | |
| BTC | NUS Bukit Timah Campus (Oei Tiong Ham Bldg) ↺ Kent Vale (Loop) | Withdrawn after Dec 2025, replaced by NUS P |
| E | University Town ↺ NUS School of Design & Environment (Loop) | Withdrawn after 5 Dec 2025 |
| L | NUS Bukit Timah Campus (Oei Tiong Ham Bldg) ↺ Botanic Gardens MRT (Loop) | Withdrawn after 2 Jan 2026, replaced by NUS P |
Fleet
Diesel Buses
Electric Buses
Retired Fleet:
- Mitsubishi FUSO RK117
- Mitsubishi FUSO RM117
- Mitsubishi FUSO RM118
- Mercedes Benz OF1318
- Nissan Diesel SM215H
- Nissan Diesel SM217L
- Hino RK3HMKA
- Isuzu LT133P
- Mercedes Benz OF1318
- Volvo B7R
- Sunlong SLK6905 6.7m (2010)
Gallery:
Back to Shuttle Bus Services
There is an upcoming BYD B12 electric bus for NUS shuttle later this year to replace Volvo B9Ls registered in 2015.
Only 10 BYD B12 buses, but also lots of Zhongtong N12