I think s/he meant whether it can support DD/bendy or not, not
whether it needs DD/bendy or not.
Svc 3 - Dr 2 bound St 21 have a wider area for the CDGE/VSO 539
uses to manuvere. The Dr 4 bound side is quite narrow. Corner in
question is believed to be turn after Dr 4/St 21 junction.
Svc 29 - Only road in question is probably Cranwell Rd, maybe
Netheravon Rd have tree issues, but generally is okay for the rest
of its route.
Svc 32 - Frankel/Margerat should have no issues.
Svc 40/42/401 - Siglap Rd is rather hilly and twisty, DDs may
have issues manuvering the road.
Svc 84 - Old 82 VO3x/405G can somehow turn there last time.
Svc 92 - Could be Mt Sinai
Svc 191 - Probably Portsdown Rd
Svc 200 - South BV Rd is known as one of the hardest road to
manuvere in SG.
Svc 265 - AMK St 54 can support DDs. It is quite wide.
For service 40, 42 and 401, no need double deckers. Unless you
quite relaxed with your 482.