What I’m saying is when turning left, the inner lane should enter the left lane of the 3rd road, not the right lane. You stay in your lane in a roundabout.
To be fair, I can give you two examples of where that is impossible in my city.
We have at least one roundabout where you enter where there is 2 lanes but by the time you get to your exit, it is only one lane. But not everyone realizes one of the lanes isn't going to exit when they get to their exit so there's confusion as in "WTF did that other lane of traffic go?" or "WTF did my lane go?"
This one has 3 exits but in the space that would normally have 2. One enters with 2 lanes but
there are no lane markings in the roundabout. If you take #2 when you mean to take #3 or vice versa, you find yourself on a controlled access parkway and a rather long detour. So there's a lot of confusion as people unfamiliar with the roundabout come to a crawl or stop in order to read the road/direction signs while others who know what to do are expecting a flow of traffic in front of them, not stopped cars.
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Conversely, in my second example there is one section where 1 lane disappears
in the roundabout and then reappears. To make matters worse, you have to go to the streetview to see the confusion since the google satellite mapping isn't up to date. It is the T-intersection of #32 (an E/W road) with #59 (roughly N/S). At the zoom that would show the lane markings, the imagery is old so you just see a shadow of the roundabout overtop the old satellite view.
For 3/4 of the roundabout, it is 2 lanes. But there is 1/4, between southbound exit and northbound entrance, where it is a single lane.
If going south on #59 intending to turn east on #32, you enter from the left lane (which can also go straight south). Your lane becomes the single lane in the roundabout, until you go past the northbound traffic
which has two lanes entering the roundabout and you may now have a car to your right. One has to hope to hell they are following the rules (and lane markings before they entered the roundabout) and are turning east as well. The problem is since you are in one lane and about to exit, you tend to move to the right side of the lane because you are about to exit. Suddenly you are in conflict with northbound people wanting to turn right and no longer in "the correct" lane even though when you started the turn there was only one lane so it was impossible to be in the "wrong" lane.
Here's the streetview, looking north, showing a single lane at the point where the two northbound lanes enter the roundabout.
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In theory, V12.x is reading the road markings and signs before the roundabouts and behaving accordingly. Or, at the very least, learning from previous mistakes, updating its local mapping database and will remember for future trips through these nightmares. From the sound of it, 12.3 isn't in a place to fully exploit the promise of AI learning. On the other hand, it if doesn't, I won't mark it down because it is driving like a human; imperfectly in exceptional circumstances. It is the speed at which it takes the roundabout and its signaling to others which will, at best, make it equivalent to a human driving and make me comfortable with it in these situations.
Aside from exceptional (in a bad way) nightmarish roundabout designs, as one can see from the comments in this thread (and in our local reddit), how to use a roundabout properly is something most drivers don't know.
Even if you are using it properly, and signaling your intentions (left signal on when you enter if you are going straight thru or left, then right signal after you pass the last entry point before your exit), I believe for at least the next generation of drivers (i.e. 20 years) roundabouts with more than one lane will remain a source of confusion and where there is confusion, there is a risk of collision. The advantage of roundabouts is those collisions occur at much slower speeds so damage to life/limb and car are less than when someone blows through a red light. Having lived and driven in England, I'm very much pro-roundabouts especially as a driver. As a pedestrian they often suck since they increase the walking distance. On the other hand, having just watched a pickup blow through a stop sign as I stepped off the curb to cross (and spin his tires as he accelerated through the turn) perhaps I should be thankful for the traffic calming effect they offer.