66 shld be getting one also, 162 also.
Im not sure about 63,100,33,32.
No
need for DDs on 32, 63 or 162. SDs do not get full,
why need DDs. 63M supplements the high loading sector very well.
infact with too much capacity now. 66 has 64/65, 67/48, 157/174 and
multiple other options along its route. So DDs on 66 is a luxury.
33 also doing fine with SDs.
The only service IMO
that really needs DDs is 100. The loading is very high between
Serangoon and CBD...