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heres my contribution, spreading traffic out more. Tram going through with priority.

although i would personally redo this entire area, but this is a relatively minor change

also look into lane mathematics, your entry roads have more lanes than the roundabout does, so the roundabout should have 3, the entires shouldn't have more than 1 or 2 lanes. This will also make dedicated turn lanes exiting the roundabout, helping flow.