The denouement of "The Magic Roundabout", Swindon, Wilts, UK
Decoupling is called "The Magic Roundabout" - and it's not an illusion, with six interchanges,
curl up into one. You have to spin clockwise in small interchanges
and move counterclockwise on the largest in the center. Madness!
Once there the first time, not everyone can overcome this isolation.