On Tue, 20 Dec 2011 06:56:00 -0800 (PST)
bob wrote:
Have the universal joint at floor level with the upper deck instead of at
floor level with the lower deck. Fairly simple.

But that would just shift the problem from the upper deck floor
aticulation to the lower deck floor articulation. The problem is

Not really , both floors would articulate the same amount but it would
be less that the upper floor would do it if the joint was in the usual place.

accommodating vertical curves on both floor levels simultaneously.
Without having a telescoping floor section vertical curves can not be
handled, and I would have worries about the safety implications for
passengers crossing the join as it stretches and contracts.

I've never heard of anyone being squashed inside a bendy bus because of it.

B2003