Just come back from Amsterdam where they operate a decent tram service
and also bendy buses. On BOTH the rule is: boarding ONLY at the front
and you must show your ticket to the driver there, and only then may
you pass down through the aisle to the rear; to alight you use the
middle and rear doors (sometime through the front doors if no-one is
trying to board). On trams they also have a ticket inspector/seller
opposite the central doors for those boarding there. Whatever you MUST
show your ticket to boatd. Seems to me T4L doesn't know how to operate
their bendy buses. All they have to do is to restrict boarding to the
front doors only. CJB.