Looks like we need an extra traffic calming type: the ghost roundabout -- see http://www.bbc.co.uk/news/uk-england-cambridgeshire-38063742
Comment from ff5722 on 24 November 2016 at 08:11
Looks similar to this: https://firstname.lastname@example.org,6.1317876,3a,75y,212h,58.87t/data=!3m6!1e1!3m4!1sAB-lfJSwOliOZZOD0Y3KrA!2e0!7i13312!8i6656!6m1!1e1?hl=en
Just for decoration. Actually it's quite a subtle way to mark crossings to alert drivers that traffic from the right has right of way.