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I work in Carmel and live in Fishers, next door. I love the roundabouts! So much better than a 4-way stop or sitting at a traffic light. And they are so much safer as well. The only time it becomes dangerous is when people don't pay attention. I don't know how many people I've seen continue left in a roundabout when they're in the right lane or when a single lane road widens into a two lane roundabout and the left lane is supposed to go left but people still go straight. Despite all kinds of markings with signs and paintings on the road, people still don't realize you can't always turn left in the right lane. And every once in a while you do come across the idiot that is already in the roundabout and stops to let people waiting enter!
As for the OPs question, where I work supposedly has more roundabouts than anywhere in the U.S. and I almost never see anyone signal in them. When I see someone approaching the roundabout with their right turn signal on, I assume it means they are turning right, though many times I've seen them continue on through the roundabout. But 99.5% of the time nobody signals at all. And if I ever saw someone signal anything in a roundabout, I wouldn't believe them. I just wait and see what they are going to do.
About an hour ago, while waiting on a side road before entering the very busy Somerville/Raritan traffic circle in Central NJ, I looked to my left, and what I saw was...definitely a first.
Somebody in a beige Lincoln sedan had made a left turn onto the circle from a different side road, and had then attempted to drive the wrong way around the circle!
I was too far away to see who (or what) was behind the wheel of that Lincoln, but, clearly, whoever it was should have to be re-evaluated in terms of his/her/its ability to drive a car.
The only good news is that this moron did not get very far, because there were three solid lanes of traffic in the opposing direction, so everything came to a complete halt while this...person...make a badly executed K-turn in order to go in the right direction.
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