The whole premise of a roundabout is that all traffic from 4 directions keeps on moving, and when you're actually IN the roundabout, you have 3 chances to get out of it toward the right if fire trucks come up behind you.
There's nothing worse than being stopped at a light at an intersection of 4-lane streets, and some fire trucks come up behind, or at, the line of stopped cars in the left lanes, and you cannot get over to the right because of the lines of cars. The horn blasts and sirens from the trucks are horrifying and sometimes there is nowhere for you to go to get out of the way!
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