Traffic light control on the MK roundabouts is a quite recent thing Mick... And not many do although the number is slowly growing...
One roundabout I know did and after a while the lights were removed after they caused huge congestion problems that never previously existed!
In another case of foolishness a large and perfectly functional roundabout was removed an replaced with a conventional four-way traffic-light controlled crossroads... It took a year of disruption to construct and has been a dangerous congestion pinch-point since
mickthemaverick wrote: ↑27 Jan 2021, 18:50
However I have wandered from what I meant to say which was that if everyone used roundabouts correctly there would seldom be the need for traffic light control, although I do accept that in some exceedingly heavy flow conditions they are needed to give the minor roads a chance!!
Exactly! It is a well known fact that one particular roundabout - the one at the top of the A5 near Old Stratford - always used to flow better when the lights failed... That may no longer be true as last year it was completely rebuilt and it does not look so amenable to working well without lights. Rather than being a normal roundabout with light added as an afterthought the new one looks to be engineered with lights as an integral part of it...
Good point about minor roads though
Have you seen the newly-built odd roundabout in Bicester (near the big Tesco) where under light control one stream of traffic goes through the middle of it...
Bizarrely, it works quite effectively...