On Tue, 16 Oct 2012 12:56:13 +0100
Paul Corfield wrote:
exit. I'm sure there used to be special traffic lights that could
stop the A406 traffic when such a manoeuvre was required.

On a related topic - there were some manually operated traffic lights that let
trucks out of a private side road on the eastbound just before brent cross
flyover but they've recently been taken out of service.

B2003