OK, but some roundabouts have single lane in the middle (marked with yellow diagonal marking). So with two lanes coming in and half way around the thru portion of the RB it narrows to one lane on opposite sides. This IMO confusing and why the narrowing 180 degree through the RB when within 4 lane RB? Which the example don't cover.
I try not to be beside someone in the RB, ahead or behind cars in the inside lane. I notice blinkers would help entering RB from cars exiting. But IMO lot going on in the RB so reaching for the turn signal may not be good option for some.
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