One reason why Svc 151 and 154 didnt turn into Toa Payoh is
because of the road system before the upgraded CTE/PIE Interchange
opened in around 1994/1995.
Then, there was a slip road from PIE (Jurong) towards Toa Payoh Lor
2. On the other hand there was no slip road from PIE (Jurong)
towards Kim Keat Link.
Since there was no slip road from PIE (Jurong) towards Kim Keat
Link, Svc 151 & 154 could not turn in at that time, which
results in their current route today. I wonder why SBST didnt
consider or revising those services? They think that there's enough
links from Toa Payoh? not really..
There's no Toa Payoh Services plying Clementi Rd, Jln Ahmad
Ibrahim, North Buona Vista Rd, Moulmein Rd, Loyang Ave, East Coast
Rd, Punggol Estate, Great World City area, Tiong Bahru Plaza area,
Ganges Ave and many many more...