Jeremy Parker wrote:

Ah yes, a Barnes dance - named after NYC Traffic Commisioner Barnes,
who was Commissioner during the 1940s.

The Burnt Oak one was the second in Britain, I gather. There was an
earlier one in Sussex somewhere. Half a century for ideas to cross
the Atlantic (in either direction) is about par for the course, I
suppose.

There are hundreds of them already in London - it's just that most of
them aren't marked as such and don't have a distinctive audible warning
either.

The Burnt Oak barnes dance stated off as part of DfT (as it then
wasn't) research project S205Q. "Junction Improvements for Vulnerable
Road Users", project management by Faber Maunsell in St. Albans.
Mysteriously there has never been a report of the research, and none
is planned, although the research should long since have been
completed.

The most controversial junction "improvement" being researched was
the idea of putting bike lanes round the edge of roundabouts. That's
an obvious (to me) killer. If you are ever riding a bike round a
roundabout, stay as far away from the bike lanes as possible.

One good idea the London Cycle Network designers had was to put bike
lanes on the roads one street out from a roundabout where possible, thus
avoiding the problem.