Singapore Buses route 90

Service 90 is a trunk route from Toa Payoh Interchange all the way to Paya Lebar Airbase, providing bus connections to the staff and office workers working at industries along Airport Road together with service 94. Demand is concentrated at peak hours.

Double decker buses stopped operating in 2003, mainly due to the retirement of Leyland Olympian 2-Axles. This was replaced by Scania N113CRB (NAC) buses, followed by the Mercedes-Benz O405s from 2008 to 2010 and finally it was replaced by Scania K230UBs. Double decker buses were re-introduced in 2012 with service 109, and it is mainly due to the Jordan Kwan.