In message , at
13:46:41 on Sun, 13 Oct 2013, Neil Williams
remarked:
Unless, of course, the tunnels are fundamentally not to motorway
standards (eg quantity and position of escape exits) in which case
perhaps it's simply not allowed.

While cycles and pedestrians are not allowed, is other non motorway
traffic such as slow motor vehicles perhaps allowed?

The biggest category is probably learner drivers (who are allowed as far
as I can tell).
--
Roland Perry