There's a small modern circle on the outskirts of Birmingham on a traffic roundabout near Saltley/Alum rock. Been there about 10 years now. Was more noticeable when the roundabout was smaller, has been widened in recent-ish years.
https://www.google.co.uk/maps/@52.4924536,-1.8707493,3a,75y,147.04h,101.1t/data=!3m6!1e1!3m4!1sW3nHfspdIsSWFht-NuqAxw!2e0!7i13312!8i6656