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I looked at the street view and it was this roundabout. I've attached a diagram showing our relative positions as I entered. As I said, I saw him a bit before the first position shown. Should I have waited, do you think, given where we were? My judgement about how safe it was to enter the junction was partly driven by the fact that there were two entry lanes on my side and clearly passing room on the roundabout itself. His judgement as to the danger of the manoeuvre was probably driven by the fact he had to pass me back into one lane of traffic at his exit.
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Looks to me like he was freaked out by the pinch situation and vented at you on the basis of a 'I'm faster than you so you should have given way to the right even though you were there first' thing, which to be honest is quite a common expectation of tractors/trailers/other slower-moving traffic (not commenting if it's a correct expectation or not).
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I looked at the street view and it was this roundabout. I've attached a diagram showing our relative positions as I entered. As I said, I saw him a bit before the first position shown. Should I have waited, do you think, given where we were? My judgement about how safe it was to enter the junction was partly driven by the fact that there were two entry lanes on my side and clearly passing room on the roundabout itself. His judgement as to the danger of the manoeuvre was probably driven by the fact he had to pass me back into one lane of traffic at his exit.
From your description, you were not at fault, and at any rate didn't think it was a particularly dangerous situation. Did you mean to draw the driver's position in the wrong entry lane for the manoeuvre he was about to attempt or was he in the correct (offside) lane?
I imagine that I would have waited a moment for the driver to pass if I'd seen them, even if they were in the wrong, but it's easy to say that without having been surprised by the situation.
Asymmetry in the number of entry and exit lanes is another common problem with roundabouts, but here the assumption is that the offside lane will be used only by right-turners, so that only one exit lane is needed. (It obviously doesn't always happen like that in practice.) This is the case at very many junctions. As I said earlier, the driver should have followed you (rather than using the wider space on that side to manoeuvre himself into a conflict situation).
Anyway, such innocuous incidents tell you quite a lot about junction design. Here I wonder if there are often long queues there for drivers exiting Victoria Road, and if that may have influenced his behaviour. People are sometimes terrified of having to wait.
That's a full roundabout, though, not a mini-roundabout. None of what I wrote above applies here. Not the best design I've ever seen, but not the worst by any means. Are you sure it was that one? The driver coming in from the right would most certainly not have been able to see you here until quite late.