Zoned routes DD1 and DD2 were introduced to ferry passengers in Zone D during the COVID-19 pandemic.
History of Bus Routes Ep 11: CC/CCX
Zoned routes CC and CCX were introduced to ferry passengers in Zone C during the COVID-19 pandemic.
History of Bus Routes Ep 10: BB
Zoned route BB was introduced to ferry passengers in Zone B during the COVID-19 pandemic.
History of Bus Routes Ep 9: AA1/AA2
Zoned routes AA1 and AA2 were introduced to ferry passengers in Zone A during the COVID-19 pandemic.
Zoned ISB Routes for AY20/21 Semester 1
ISB routes were replaced by zoned routes from 20 July as part of measures to deal with COVID-19.
The ISB Man 