In message
p.homeip.net, at
19:19:00 on Tue, 9 Mar 2010, Paul Cummins
remarked:
Please explain how you take another route when you are already on
the M4. You can use crayon if that is all they will allow you.

Get off at the next junction, maybe? The M4 is 193 miles long and has 49 junctions -
that's a junction every 4 miles or so, on average.

But there are stretches much longer than that, east Reading to west
Maidenhead, for example. (I forget the exact names of the junctions).
--
Roland Perry