"Clive D. W. Feather" wrote in
:

I was led to believe that the law regarding filter arrows is thus:

Here's what the law actually says:

[ ** snip chapter & verse ** ]

Thanks Clive. Wading through the legalese (*when* are the Plain English
Society going to start having an influence on those who draw up
legislation? ) I now know far more than I ever cared to about traffic
lights!

But more importantly you (and other posters) have corrected an erroneous
belief that I had. Thanks.

Iain