Hi, did a random observation when waiting for my bus since I was too bored.
My observations are based on buses which arrives the bus stop packed to the brim, most pax alights at the bus stop, and a new batch of pax from the bus stop fills up the bus to the brim again.
Bus stop: 17179 Clementi MRT
KUB on 154: 2 minutes 20 seconds
TIB858A on 184: 3 minutes 5 seconds
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Do share your observations