I assume you took a DAF bus. This bus is one of the lower-end
series in the SMRT Buses fleet.It used to be a very good bus back
in 1995, while being controlled by AMKDEP, but after being
transffered to KJDEP, it wasn't cleaned and maintained well. This
explains why you had an uncomfortable trip.
PS: You might want to write a complain to SMRTbuses thru their
website.