Passengers will feel uncomfortable due to STOMPers. For drivers,
your milage may vary. Sometimes, the way they drive or answer
queries from passengers would provide clues. Practice discretion
and you should be generally safe. There's always another day if you
can't get the shot.
As in, i'm taking the pics from the pedestrian walkway, so the bus
just zoom past and i snap, isit ok?
And if the bus is stationary, i just snap and walk away..ok?
I'm a bit hestitant because of that recent incident involving
that somebody. :X I also do not wish to get into trouble with the
SBST or SMRT because of photographing their buses, or get STOMPED
by uncomfortable passengers.