28 - from tampines interchange to SAFRA tampines
53 - from serangoon mrt to airport
605 - from orchard area to bt merah
156 - from bt timah rd to macritchie
132, 165, 166 - from ang mo kio to macritchie
66 - from dunearn rd to macpherson rd
73 - between ang mo kio interchange and toa payoh interchange
by the way, the demand for 81 is pretty low from pasir ris onwards
to serangoon... basically because 72 provides a much much faster
route from tampines to hougang ave 3 and then 53 also provides an
alternative service from pasir ris to serangoon.
