an interchange has 2 main purposes.
as a centre point for the whole neighbourhood, served by feeder
svcs
as an start/end point for services frm one town centre to another,
served by trunk svcs
looking at yew tee, bukit gombak, simei, you can literally walk frm
the centre to your house. thus, there isnt a need for an int.
the Punggol Int and Sembawang Int shud last a couple of
years(>10yrs) IMO.
