wrote in message news
On Wed, 15 Feb 2017 10:46:24 -0000
"tim..." wrote:
wrote in message news
On Wed, 15 Feb 2017 00:10:31 +0000
Neil Williams wrote:
On 2017-02-14 23:01:46 +0000, Richard J. said:

Ealing have been doing that for several years, e.g. the traffic lights
at the T-junction outside Acton Town station (opposite the entrance to
the LT Museum Depot) were replaced by a mini-roundabout and a zebra
crossing about 5 years ago.

Luton airport for years had a terrible congestion problem on a Monday
morning. This started happening soon after a set of traffic lights was
installed at the approach roundabout.

Putting traffic lights on roundabouts has always struck me as a
ridiculous
thing to do. Its as if the traffic planners didn't quite understand the
purpose of a roundabout or how it worked and assumed it was no different
to a 4 way junction. Once you've added the lights the roundabout is now
completely redundant and you'd probably get better traffic flow if you
did
replace it with a simple junction.

bit difficult to do when the roundabout is above a motorway junction

There will always be exceptions. But having roundabouts as motorway
junctions isn't a requirement.

well no

but we do have them

and IME they are invariable the ones where traffic lights have been
installed to "improve" flow

(admittedly not all of them are of the "above the motorway" variety)

tim