On Tue, 03 Jul 2007 14:24:59 -0700, brixtonite
wrote:

But saying buses run every 9-11 minutes is equally bizarre, since
obviously there are plenty of times when you get two buses together
and then nothing for fifteen minutes: 'every ten minutes' is a more
sensible thing for the timetable to say, since '9 - 11' implies
greater accuracy. What is one to make of a timetable that says buses
run 'every 8 - 12 minutes' at some times, and 'every 9 - 10 minutes'
at others?

That in the first case you need to leave an extra 12 minutes for your
journey in case you miss one? I'd prefer a real timetable so far as
possible (and I realise it isn't necessarily feasible in congested
parts of London).

Neil

--
Neil Williams
Put my first name before the at to reply.