John Rowland wrote:
I noticed today that some of the lead lattice windows in Tower Bridge have
been replaced with plain glass, so that some sort of cameras can peer down
on the bridge. Does anyone know the purpose of the cameras?

I have only just noticed that it is 20mph across Tower Bridge so are
they some sort of speed camera. What are the cameras on a gantry on the
northern approach for, they look congestion charging cameras, certainly
not speed cameras.

kevin