Here is some analysis I did on roundabouts.
Yesterday I let the car take its time and complete several roundabouts as there was no one behind me. Then I analyzed the videos.
- The car slows down to below 5 mph, even with no traffic. We normally slowdown to the speed required to navigate the roundabout - 15 mph or so.
- Then the car takes 2 to 3 seconds before starting to increase the speed again
- Larger roundabouts with lower curvature are handled better than small roundabouts with higher curvature.
- In one small roundabout, the car took nearly 10 seconds to complete the roundabout that people normally take only a couple of seconds. Lots of wheel jerking. At this roundabout, the car is so unsure that if I press the accelerator to speed things up, FSD disengages.
- When the roundabout is not mapped, FSD treats it as a temporary bend in the road and only slow down very late. It may negotiate the roundabout if the curvature is low. If the curb is low, it might hit it too.
- One way to figure out whether the roundabout is in the (internal) map is to look at the navigation (see examples below). If it shows a round about, its in the map.
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ps : Yes, thats the "Santa mode" enabled. Easiest way to do that is to use the mic to say "ho ho ho".