Bunching. I am sure SBST does not want them to go together.
And many times BCs play games. Seen many BCs driving extremely
slow, and many BCs who drive very fast as they do not have many pax
to take on bus stops. I have seen this on 147 many times esp during
morning peak towards CBD. You can spot 3-4 DDs easily bunching up,
one of them will be 147A and the BCs drive like a train, rather
than one of them slowing down and keeping a 2-3 mins
separation.
On Bendemeer Rd, if you keep 2-3 mins separation, you can still
get good number of pax.
Some BCs, think their time got alot, then drive slow slow, then
when DDU finally beep beep beep, then chiong mode all the way. 88A
BCs have DAMN LOT time. So they incidentally bunch up with other 88
buses coming past and it's purpose is defeated when it reaches the
bus stop LATER than the 88 bus.