Too bad, Changi Airport PTB 1&2 basement bus-stops cannot be
upgraded into A/C queueing area.
I blame the poor design of Terminal 1 & 2. Had the ecsalators
been located directly down to the basement bus-stop passenger
queueing area, passengers will not need to cross over the driveway
to queue up for the bus. Therefore, the queueing berth can be
air-conditioned. Also, it's less dangerous as passengers do not
need to dash across the driveway to board the bus.
Also, the early airport planners failed to forsee the future by
catering to double-deckers and articulated buses enter the basement
too....