As many have said, take the lane. If the driver of a car thinks they can clear the gap between a bike and the curb, they'll do it. Get right in the middle of the lane and make them wait the 5-6 seconds it takes you to clear the roundabout.
You know why the bollards blocking vehicle access to a MUP/MUT are like 2' apart, so narrow that even a bike has to carefully navigate through them? Because if they were even 4' apart, some idiot would try to fit a car between them.
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