Sometimes, having weekend perm service can bring good to commuter
wit decreasing frequency.
For eg. SBS8372A is 131 perm during weekdays but is 157 perm
during weekends.
But cons:
131 will lose one bus instead.
oh please la..
131 lesser demand on weekends -> lesser buses on 131 ->
131 buses in depot idling
157 lesser demand on weekends -> lesser buses on 157 ->
doesnt warrant DD on 157 -> uses SD buses from other service
You seem to have this impression that all buses are out on
service every single day.