i'd rather allow certain svcs like 852, 853, 854, 855 to go WAB
asap.
Not possible at the moment except for 854 until they finish
renovating the berths at yishun interchange.
857 and 853 might be first to get WAB status because the route
is pretty much fully WAB friendly other than a few stops and yishun
interchange. 852 and 855 still have to wait for bb int and hbf int
to get their wab friendly berths before it can even get the
status.