I know this reply was from early-Dec 2013, but I just came
across this post. And I would like to point out that for Sv 53
(which you were replying to with this post), nopes you're mistaken,
the first trip from CGA for Sv 53 is not the first bus from
Bishan Int.
the 0548hrs first trip from CGA is done by a Sv 53 bus that
starts its trip from CGA itself, ie it's literally a half-trip all
the way from CGA to Bishan. That first bus usually reaches CGA
around 0530hrs+ off-service and then layovers till its timing to
start the 0548 trip from CGA T3.
1st 24 from AMK is the 3rd bus from CGA, but the 7th bus back at
AMK.
1st 53 from BSH is the 5th bus from CGA, but the 14th bus back
at BSH.
1st 53 from CGA is the 1st bus from Pasir Ris Dr 12 at 0520hrs.