You mean YCK to Serangoon?
The route between Serangoon to Suntec/Shenton Way duplicates CCL
Stages 1 and 2 from Esplanade all the way too Serangoon.
Again, service 70 will also duplicate service 103/103W from
Serangoon to Jln Kayu.
Between Serangoon and Suntec, actually there are 2 parts of the
route which do not duplicate the CCL: Upp Paya Lebar Rd (between
Upp Serangoon Rd and Bartley Rd) and Guillemard Rd.
At this stretch of Upp Paya Lebar Rd, there are alternative
services 22, 43 and 58 to Serangoon station. But at Guillemard
Rd, it's about a 10 minutes walk to Dakota station, it will cause
much inconvenience if the Guillemard Rd sector is deleted.