Well, 172 now goes to Jln Bahar and Old Choa Chu Kang Rd
area.
By the way, the original old route of 172 wasn't that. It used
to go loop at Jln Anak Bukit, near Bt Timah, under
SBS.
Now, it's 975, under SMRT buses, that goes to Lim Chu Kang.

there's even older route of 172 which indeed goes to Lim Chu
Kang
my mum's time