I think 180's freq also siao siao one
1 time slot of say 10 mins siao siao 2 mins per bus, aft tat 10
mins.. bef 11 mins..
still meet QoS.
2 mins per bus is as good as waiting for entire Bt Panjang area
to get flooded w/ excess capacity, after which not enough buses

Tis same goes to how SMRT plan MRT schedule prev.. 4 mins, then
spam 1 min, 1 min, then make u wait 7 mins at 0730 am peak
hrs bef 1 min, 1 min.
Then tell you sorry train cannot wait got max dwell time.
Seriously I dunno how they plan this elite schedule one.