General Road and Highway Discussion

[tomh009]

European-style mini-roundabouts (without a huge centre island) certainly would fit.  Whether it would be a good idea or not is another thing.

Is a 2-lane mini-roundabout a thing?  Would you be able to point me to an example?

I can't think of an example offhand, sorry!  I'm quite sure I have seen some of those, although this kind of thing (roundabout with two lanes in a tight space) is certainly not as common.