Roland Perry wrote:
In message ,
Richard J. writes
The Thames bridges also have "traffic lights" for vessels, so this
is actually a SPAD as well!

I doubt it. AFAIK the lights are to show which bridge arches are
available for navigation. There was no reason to stop vessels
passing under the bridge, but it's the skipper's job to ensure he
has enough headroom.

I still think there'd be *additional* signal lights to indicate
when it was lifted.

ps Lifting schedule:

http://www.towerbridge.org.uk/bridge_lifts_schedule.htm

.... on which the Lord Nelson does not appear! Incidentally, I
understand that the intention was to pass under a raised Tower Bridge,
turn round and return downstream to West India Dock, and that she did
the same journey last year. The Lord Nelson is currently moored,
apparently undamaged, at Thames Quay, West India Dock (200 metres east
of DLR South Quay station) until Thursday 20 May.

--
Richard J.
(to e-mail me, swap uk and yon in address)