DDs impractical for 900 901 902. maybe it would be alright for
903 since its the longest. 911 913 should stick with bendies due to
the nature of the routes, maybe 912 could be a candidate for
DDs
903 should be alright for DDs actually. 900, 911, 912 and 913
are impractical for DDs while 901 and 902 can use it. However, 901
and 902's commuters are also mostly short-haul, like 912 and
913.
For YIS, 800, 804, 811, 812 are impractical while 806 is
DD-friendly. 806's commuters are mostly long haul, but it uses
bendies due to fast alighting at Yishun MRT, as seen in TIB1218R's
video. It took only one minute for all the pax to clear.
CCK on the other hand, 302 is something like 912 and 913, so no
DD. 307 is due to CCK St 62 and Teck Whye Lane so no DD, and 300
might not get DDs due to either CCK Ave 2 or the CCK Ave 5
roundabout.
If SMRT gets DDs, put it on 190 and 106, and probably only on
903. 188, 851, 854 and 963 can use DDs while 169 and 969 can still
stick with bendies.