i dun think sv 268 need DD. its route are mostly duplicated by
Sv 76.In morning peak, in the direction from AMK Mrt to Industrial
Park, there are downroute Sv 268 and also Sv 268A running at very
fast interval.
From AMK Ave 4 direction, its route to MRT are duplicated by Sv
76/269. Even Sv 76 DD can be fully packed till the entrance door,
there are alway plenty of empty seats on the upper deck, if you
look carefully. So if Sv 268 use DD, i dun think the passengers are
willing to go up as well.
For Sv 269, nowadays it is alway packed at evening/night
time/weekend from INterchange. However, i think it can just add one
more bus to improve the frequency. Now the frequency seem like
10-15 mins even during peak hours. If put DD, think no one wan to
go to the upper deck..