Arthur Figgis wrote:

No. It would be very hard to enforce it, with a walk-on service.

On buses, where there is a stated capacity, it is either unenforced or so
high that you couldn't reasonably get that may on anyway. The one thing
that doesn't usually happen is standing upstairs, though that is more
because people don't do it than because anyone refuses to move the bus
until they go downstairs.

Neil
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Neil Williams in Milton Keynes, UK. Put first name before the at to reply.