In message , at 20:18:31 on
Tue, 8 Mar 2011, Paul Corfield remarked:

I have no idea how a driver can possibly tell that a passenger wishes
to alight in they remain sit in their seat and provide no other
indication of their intent.

The buses I use have a bell-push within easy reach of just about every
passenger's seat (OK you might have to get up, but you'd be making your
way out anyway).
--
Roland Perry