>>3519588Roundabouts are fine in light --> medium traffic, but in heavy traffic they cause one (or more) entrances to become congested so they stop being useful. So, they then put traffic lights on roundabouts which defeats the entire purpose of having a roundabout (i.e. to assist traffic flow).
OR, they stick in 'magic' roundabouts, which are 5 mini roundabouts around a large roundabout. Pic related.
