because your timing is fixed
but in bet, from wat I noticed is aft 1730 where problems
starts to arrive.
You can be standing at the Blk 185A bus stop seeing 1x 177
heading to BPJ... Wait wait wait, it'll only appear when e 2nd 177
heads to BPJ
The 3rd 177 could end up meet at MINDEF HQ while en-route to
BBT.
Likely e actual run time has a part on tis... Full journey at
1745 from Bt Batok could take 28 mins to complete. Not much to
mention how long it can take to get to BBT.
Yes 30 mins headways usually occurs for last bus. The last bus
on some days could depart BPJ @ 1840.
My timing isn't fixed, cos there will always be duties, meetings
that drag, extra work to complete etc. and the buses will tend to
arrive at about the same time everyday. But that's in 2009. Maybe
the situation deteriorated after the depot swap.