Personally I think the buses that need DD fleet add or DD-SD
replacements are 59(+3), 69(+3), 74(full DD), 147(full DD), 240(+2)
and 242(+2). 196 still fine with some SDs running on off-peak hours
and the SBS8535Y slot.
IMO they can cut down on the number of DDs on 97(-3, don't
really need so much DDs), 132(-3, redhill-bt merah major problem),
153(-4, peak hour uni-directional load) and 165(-3, CCL eating up
the load).
101, 112, 113, 116, 315, 317 and 325 don't really need
DDs...
113 is only high loading on a certain sector.
116 is a low loading-middle loading service.
315 becomes redundant after 116 was introduced.
317 load doesn't justify DDs.
325 has a turning restriction as what SBS2656X, a daily commuter
on 325 mentioned.
IMO too 101, 112, 113, 116, 315, 317, 325 don't need DDs. 113
has high loading from Kovan to Lor Ah Soo (uni-directional) during
peak hours, but its loading is only where 113A plies, and hence you
have 113A. The route of 113 from Kovan to HG is redundant. You have
62, 82, 107, 112, 325, 74, 147 covering its route at different
parts of the route.
Regarding other services, I totally agree that 59 and 69 need
more DDs. 74 should get 2 more DDs and should be okay, 147 should
get 1 more DD and 4 SDs can ply by adjusting headways right behind
the DD to take additional passengers. 240, 242 can cope well with
the load as of now.