I did find a thread on Reddit about a Foz XT driver that was trying to navigate a traffic circle, and due to geometry and forward-facing angle of the lanes, the ES auto-braked on him several times and caused an accident. I could see, technically speaking, why this could happen: your car is pointed at an angle because of the nature of a circle and you're pointed at the car in an adjacent lane, so when you give it some throttle to get out into your lane when you deem it safe, the ES isn't aware of your steering wheel input and therefore predicts you driving forward into the person next to you.... I guess....
Then again, I think if roundabouts and circles were a regular issue, I think we'd have thousands of posts about them by this point.
I think I found the Reddit post you're referring to. The driver didn't have an accident, just nearly had one. And he included diagrams to show his intended path, and where he had the issues. I'd go mostly here with driver impatience and error. Two lane roundabout, with four two lane roads entering it. He tried to cut across the outside lane of the roundabout to the center lane and was then wanting to go to the inside lane of the highway directly opposite him. So based upon his own diagram, it was driver impatience that set the situation up. He cut across both lanes of traffic on the roundabout then ended up right behind a car with his accelerator pushed down at a high closing rate. Eyesight calculated that without driver interference - since he had shoved his gas down and wasn't hitting the brake - that he was going to hit the slower moving car ahead of him - and did what it's programmed to do. THEN once he got going, due to the geometry of the roundabout, there was another car that he was headed for that was in the outside lane and again, the system looked at the parameters and thought he was going to be in an accident.
Oh, and here's the images he posted, showing his intended path, and both times when eyesight kicked in.
http://i.imgur.com/KBA1ALH.jpg
http://i.imgur.com/O7yU79q.jpg
http://i.imgur.com/aN8Ey2T.jpg
In the owners manual for eyesight on page 27 (2017 version) it even SHOWS that in these kind of situations that the Eyesight system may activate. Complete with illustrations, which look VERY close to what was going on in the roundabout...
The Pre-Collision Braking System may activate in the following situations.
Therefore concentrate on safe driving.
- When passing through an automatic gate (opening and shutting)
- When driving close to the vehicle in front
- When driving in a location where the grade of the road changes rapidly
- When visibility is poor due to sand, smoke or water vapor in the air, or when the vehicle in front or oncoming traffic causes water, snow, dirt or other substances to obscure the view
- When passing through clouds of steam or smoke, etc
- When the exhaust gas emitted by the vehicle in front is clearly visible in cold weather, etc
- When there is an obstacle on a curve or intersection
- When narrowly passing a vehicle or an object
- When stopping very close to a wall or a vehicle in front
I can't copy the picture from the PDF file of the owners manual I have access to, to post here, sorry.