• 414
Getty Images
If you've driven in Europe or Latin America -- or even in any one of 30 U.S. states including California, Florida and Michigan -- chances are you've driven around a traffic circle or roundabout.

It's also likely that you considered yourself pretty lucky to survive the lane changes, the strange angle of entry and the rather biting question of who yields to whom. But you'd be wrong. Although roundabouts routinely give drivers fits -- as was famously depicted by the Griswold family in National Lampoon's European Vacation -- statistically they are much safer to negotiate than traditional traffic intersections.

Roundabouts are becoming increasingly common across the U.S. as states and municipalities seek new ways to increase traffic flow while reducing accidents and vehicle emissions. Roundabouts, which are smaller than traditional traffic circles, accomplish all three goals.

Pete Moraga at the Insurance Information Network told AOL Autos: "Roundabouts are big in Latin America and Europe but many people here don't know how to deal with them. The lane changes are a little confusing for people.

"But studies show these reduce common types of crashes like T-bones, that cause a lot of fatalities. With roundabouts, these crashes and rear-end crashes are reduced by the way traffic flows. We support [roundabouts] because we support anything that increases safety and reduces accidents."

While France has more than 20,000 roundabouts, the U.S. has built about 2,000 since the first was constructed in Nevada in 1990, but that number is growing rapidly. The city of Carmel, Indiana, is a case in point. In 2003 the city had 252 injury crashes on its 220 miles of roads. But by 2008 the expanding city had more than 395 miles of roadways while its number of accidents fell to 220. City officials directly attributed the drop in accidents to its roundabout-building initiative. More than two dozen roundabouts were built between 2003 and 2008, and by the end of 2010, the city had built more than 50.

Data from the Insurance Institute of Highway Safety back up the case for a wider adoption of roundabouts. A 2001 study reported that converting intersections from traffic signals or stop signs to roundabouts reduced injury crashes by 80 percent and all crashes by 40 percent. A similar study found a 75 percent decrease in injury crashes and a 37 percent decrease in total crashes at 35 intersections that were converted from traffic signals to roundabouts.



A study of 17 higher-speed rural intersections (40 mph and higher speed limits) found that the average injury crash rate per million entering vehicles was reduced by 84 percent and fatal crashes were eliminated when the intersections were converted to roundabouts. Studies of intersections in Europe and Australia that were converted to roundabouts have reported 41-61 percent reductions in injury crashes and 45-75 percent reductions in severe injury crashes.

Moraga cited a study that suggests that only about a third of the population supports the building of more roundabouts. But, after a roundabout has been built, about two-thirds to 70 percent of drivers in the community say they favor building more.

Moraga also cited one study that found roundabouts helped reduce vehicles' carbon monoxide emissions by 29 percent, and nitrous oxide emissions fell by 21 percent, the result of increased traffic flow and fewer vehicular stops and starts.
What are your thoughts on roundabouts?
I want more of them where I live. 2287 (59.7%)
I am scared of them. 1194 (31.2%)
I have never used one before. 347 (9.1%)


Russ Rader at the IIHS said: "Roundabouts are becoming more common. Many communities are beginning to recognize that roundabouts are the ideal solution to fix several problems – they not only improve safety, but they also reduce congestion and fuel consumption. Residents are sometimes skeptical at first, but once roundabouts are put into place and people see them in action, the former skeptics become believers.

"The big safety benefit is that roundabouts essentially eliminate the worst kinds of crashes such as T-bones and head-on impacts."

Because traffic moves in a single direction, roundabouts essentially eliminate the potential for dangerous crashes including right-angle, left-turn, and head-on collisions. They also reduce the likelihood of rear-end crashes because drivers don't speed up to make a yellow or green light or abruptly stop at a red light. The crashes that do occur at roundabouts generally are not severe, the IIHS said, because vehicles move more slowly than they do at conventional intersections.

Roundabouts also can benefit older drivers, as many accidents involving older drivers are the result of a driver failing to yield the right of way. An example would be a driver turning left into oncoming traffic at an intersection. This situation does not occur at a roundabout. Older drivers, Moraga said, really like roundabouts. A 2007 study in six communities where roundabouts replaced traditional intersections found that about two-thirds of drivers 65 and older approved of roundabouts.

Although some older traffic circles have traffic lights and stopping zones, modern roundabouts are smaller and therefore have a sharper approach to entry, resulting in drivers negotiating the roundabout at much lower speeds, so lights are not needed.

Obviously, crashes still occur. An IIHS study of crashes at 38 roundabouts in Maryland found that four crash types (run-off-road, rear-end, sideswipe, and entering-circulating) accounted for almost all crashes. A common crash type at both single-lane and double-lane roundabouts involved vehicles colliding with the central island. These crashes, which often involved unsafe speeds or the driver not seeing the roundabout, accounted for almost half of all single-vehicle run-off-road crashes. There were no right-angle or head-on collisions.

Roundabouts may not be a candidate to replace every intersection, for example, where the topography does not allow it or there is unequal traffic flow in the intersecting streets. But where they are suitable, chances are you'll be seeing a few more of them in your future.


I'm reporting this comment as:

Reported comments and users are reviewed by Autoblog staff 24 hours a day, seven days a week to determine whether they violate Community Guideline. Accounts are penalized for Community Guidelines violations and serious or repeated violations can lead to account termination.


    • 1 Second Ago
  • 414 Comments
      • 4 Years Ago
      Roundabouts in Carmel, In. reduce accidents and has saved lives where traffic signals have been replaced. Also the same stands for busy intersections, where before, there were four way stop signs. I use them just about every day and feel much safer when driving. Report This
      Pete
      • 4 Years Ago
      Until people in the US get used to traffic circles, I don't know why the highway authority who installs them doesn't wake up and add an additional sign under the Yield sign - specifically it should say "Yield to traffic approaching from the left"
      • 4 Years Ago
      The problem HERE! Is people don't follow traffic signs any way, why do you think it would help?!! I have one a few blocks from my house, No one will yeld!!
      • 4 Years Ago
      A roundabout is NOT the same thing as a traffic circle/rotary. At a roundabout, all the approaches (or "legs") have a yield condition, where you wait until there is a gap in the circle. Whereas in a traffic circle/rotary, the drivers within the circle have to give way to people trying to enter the circle. It is the opposite.
      • 4 Years Ago
      Perhaps roundabouts are safe. It doesnt take a rocket scientist to figure out how to drive around them. I really don't know ,however I do know I that I dislike them.
      Mark
      • 4 Years Ago
      Gee...... I guess writing a legitimate post about "rotaries" in Massachusetts, posted by a Police Officer as one who tagged someone ********** broke the law, doesn't qualify as making it past your "censors"...... maybe I should just cuss & be done with it.
      • 4 Years Ago
      Anyone who argues that roundabouts AREN'T safer than the intersection that they replaced really needs to research the before & after accident data. And their geometry eliminates the possiblity of a fatal collision as long as there isn't a fixed object in the middle circle. I know new things can be SCARY, but try to adapt.
      thepetermedic
      • 4 Years Ago
      if people are to stupid to follow red lights and green lights they are most likly to stupid to read a sign
      • 4 Years Ago
      These roundabouts are the most dangerous thing out there. No one gives an inch and then people just try for it. I have seen skid marks right through the center of the circle where people have come up to them at night. at a place they have had them for a while. Just get a good stop sign and follow the rules. Send the round a bouts back to Europe I hate them A four lane roundabout is even worse as people try to switch lanes to make their exit. Get real folks. They may save t-bone accidents but will never stop angled ones Just put up the stop signs and learn to drive.
      • 4 Years Ago
      If you are not familiar with them you will definitely be confused. It is hard to figure out who has the right of way and of course you have drivers who think they have to do 50 mph around them. You have to be considerate and defensive to those drivers from out of town. Also, the drivers who don't travel that path everyday. What you have is people trying to turn around to get back in the right direction.....like me. LOL
      • 4 Years Ago
      Some LACK OF research: Saying that VEGAS into'd these: (typical NON-informed and too-lazy-to-research "reporter"). St Louis, MO, had these in the 1950's when I was a kid when my parents drove us to visit relatives there and in the St Louis suburbs. There were MANY of them at smaller and even LARGE intersections. Once you came upon one, you KNEW what to do IF you just looked at what was REALLY going on there. An OBSERVANT driver would NOT DO what "Trishamine" (above) states: "cause her tohave an accident" because it is NOT all that difficult to figure it out EVEN WHEN you come across one unexpectedly. However, her suggestion of advertising THAT there is a "new Traffic Sign" IS a good idea. La Jolla, CA just installed several of these roundabouts along their major thoroughfare. They have the added benefit of slowing-down some drivers who were driving at higher and higher speeds. -- Ron
      tjcnopops2
      • 4 Years Ago
      Long Beach, California has had a 'traffic circle' since at least the 1950's. The author needs to research better.
    • Load More Comments