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I think once people got used to it, a roundabout would add value. No more "right" or "wrong" corners. No more "going to" or "going home" traffic since all can access just as easily.
The one exception to roundabouts that I see are intersections that have a high fatality count. That came home locally a couple days ago. The one and only intersection out in the country with total view on level ground for ¼ mile in every direction has seen a number of horrific accidents. One way is a stop, big signs, etc. Yet about once a year someone blows through the sign and is T-boned or T-bones someone else.
It happened again this week. Never slowing for the stop sign, a young woman was struck and killed. Her cell phone was found outside the car and some suspect she was texting or talking. Never saw the stop sign undoubtedly.
You would think that would be the easiest intersection in the world to avoid an accident. Too many people are doing too many things inside their car besides driving.
When visiting Sedona, AZ this summer, every intersection had been converted to a roundabout. With about 7 million tourists visiting Sedona per year, traffic was flowing without any problems, whereas when they had traffic lighted intersections, traffic came to a stand still and it was impossible to get around.
My vote is for roundabouts and less accidents.
Its funny that other areas are now building them while here in N.J. the state has spent millions getting rid of them. We call them circles here and they were major landmarks most with clusters of highway oriented commercial development. I can think of several businesses which were ruined when the circles were eliminated.
Most are too small and a semi-truck with a 53 foot trailer can not stay between the curbs whole going around. If it backs up traffic, negative; if it enhances traffic flow, positive.
I was in Ireland a couple of years ago and most intersections there are round-a-bouts. They know them better and they flowed well. Here I do no like them, the other new-bees to them make me nervous.
At least a few studies have suggested that the number of accidents actually increase but fatality accidents are reduced. And where sited is very important. If you have one road with high traffic v. the others with low traffic, problems increase as they try to shift lanes to get to the "right" exit. I know there is one in Conway, AR near a college that is a nightmare and it does back up traffic at peak times. On sparse streets they probably do reduce serious injury or fatalities.
Here in New England rotaries, as we call roundabouts, are very common. However they do take some getting used to. My first encounter with a rotary was when I moved to the Boston area about 25 years ago. Even the low traffic rotaries were somewhat intimidating. It took a little while and sometimes two or three rotations before I got it right. I still find some of the larger multilane rotaries to be very stressful during peak traffic hours. In addition if you don't know where you're going and are trying to figure out which exit is the one you really want, they can be very intimidating.
ON my vacation to Scotland, they had hundreds of roundabouts and although a pain, they appear very useful in their traffic system. It was nice not having to stop unless there was traffic causing us to stop.