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Using the direction of the title picture, assuming upside is north and downside is south, cars entered from south avenue will have to complete almost the entire roundabout if they wanna take a right turn(heading east), and vise-versa. This means a very heavy load of traffic is actually unnecessary, especially when you have a heavy load of traffic wanna make such a turn, turning the roundabout into highway will not help much too.
But this intersection is truly good-looking, I would very much like to keep it in my city, my temporary solution is that turn the unused dirt road into a on-ramp. it can reduce the load of the roundabout significantly.
Hope this comment helps.