Singapore Buses route 173

Service 173 is a trunk service from Bukit Batok Interchange and looping at Clementi Interchange, passing through Bukit Batok Street 21, Hillview, Hume Avenue, Upper Bukit Timah, Lorong Kismis, Toh Tuck and Clementi.

The demand is relatively low during peak hours.

Formerly a Singapore Bus Service (SBS) route since the 1970s, the route was transferred to Trans-Island Bus Service (TIBS) in 2000 and has been operated by SMRT ever since. High capacity articulated / double-deck buses are not deployed due to insufficient demand and many narrow roads within private estates of which the route serves.

A shortworking trip, Service 173A, will operate after the last bus has departed Bukit Batok Interchange to connect residents to the housing estates at late hours. During Eves of Public Holidays, last bus timings of Service 173A will be extended to complement the extension of train operating hours.