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Three-Level Stacked Roundabout Interchange /w Graded Sliproads

This is a three-level stacked roundabout interchange with graded sliproads by Aquilifer

Roundabout interchanges provide the joy of simplicity and flexibility of roundabouts to motorway traffic, if well designed they can cheaply connect motorway traffic together in a compact space, letting you to zone more productive space for a functionally minded city.

This roundabout interchange is a little more adventurous than a standard one with the addition of an extra road grade at the sliproads. This prevents exiting traffic from holding up entering traffic in a freeflowing style without the use of traffic lights.

A further grade could be between the traffic entering the roundabout and the ones exiting the roundabout but the benefit of an expensive road grade is mostly minimized by the already freeflowing nature of roundabouts.

If you manage to have this interchange back up traffic you might want to try adding some traffic lights to the aforementioned at-grade roundabout entry point as an easy and effective quick fix.

If traffic lights don't solve the problem however it is quite difficult and expensive to modify the interchange further and I would suggest to try and use better alternatives like Whirlpool/Turbine style Interchanges or Stack Interchanges in the few places you expect enormous amount of traffic. Those interchanges are very rare, expensive and space inefficient however and as so are best to craft yourself while playing the game.