Problem1: The presence of reverse edges with disallow=all causes the heuristic to fail
Problem 2: When the edges are wide and the roundabout is small, then most of the 'roundness' of the roundabout may be found in the intersections. In this case the low-angle heuristic fails and the roundabout is not recognized.
Problem 3: There are also false positives - pedestrian only roundabouts
Problem1: The presence of reverse edges with disallow=all causes the heuristic to fail
Problem 2: When the edges are wide and the roundabout is small, then most of the 'roundness' of the roundabout may be found in the intersections. In this case the low-angle heuristic fails and the roundabout is not recognized.
Problem 3: There are also false positives - pedestrian only roundabouts