Next time if you live in either WDL CCK or YIS, Don't come
crying claiming that rigids are pack and the roads aren't both DD
and bendy-friendly either, and all you can do is seeing 5 packed
buses straight come flying at your face, You'll know what I'll
mean.
Chua Chu Kang, Bukit Panjang and Bukit Batok were under SBS
previously, so there will be no problems for double deckers.
Woodlands as mentioned, the roads are suitable for double deckers
too.
For Yishun, the current bus interchange will be torn down soon
and replaced by one that is able to accomodate double deckers. Some
of the roads there have lower trees but they can replaced by taller
ones if LTA and National Parks are bothered to do so. Some small
trees were replace before by taller trees, especially the stretch
along Yishun Central outside KTPH.