Richard M Willis wrote:
Michael Hoffman wrote in message

Solid green means that non-emergency vehicles may not legally
cross the road you are on (although they can turn right/left on
red).

Are you sure about that ?

He was talking about US practice.

In Brentford, where the A4 joined the Ealing Road, the traffic
signals were arranged so that two conflicting flows would both
get a green simultaneously. This was some time ago and it
was the first I'd ever seen. I don't know how common conflicting
greens are.

That's no different in principle from any other cross-roads where
right-turning traffic can be in conflict with other traffic which also
has a green light. It's just that the Brentford example looks different
because the layout is that of a small roundabout rather than an open
cross-roads.

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