for 185 drivers, since the DDs are split, SDs are full day. No
issue for rotation. same goes for 59.
arbp 10 14 and 65 are the same.. since all are DDs, there's also
no issue for rotation.
as for services like 174 242....
I'm not so sure about that. 
For example, once
the JIS services had ADDs on the S shifts, the A/P shift buses also
became perm on a particular shift and BCs rotated among the
buses.
