- 2004: Introduced as a term-time supplementary service from NUS Business School and Faculty of Science (Loop)
- 2006: Renamed to Service D
- 2010: Extended to serve UTown in both directions, with the forward and reverse directions named D1 and D2 respectively.
- 2013: Extended to Prince George’s Park, no longer operates as a continuous loop route, D1 and D2 are now different routes
Gallery: (AY20/21 Semester 2)
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