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Safety benefits of roundabouts

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Re: Safety benefits of roundabouts

#12

My experience is that roundabouts help but don't solve. E.g. if there is a complete traffic jam, you may actually increase the risk of collision due to negotiations about right of way happening every time a car can move forward. Some cities in Europe have so many roundabouts, and two or three lane roundabouts with complex exit decisions you need to make on a split second - it's actually very confusing to navigate.

That's not the main point, though.

They decrease serious collisions.

Re: Safety benefits of roundabouts

#13
I’m from rural Ireland, and I always remember my first roundabout - I used go driving with my dad when learning, and as the weeks progressed I’d get closer and closer to Killarney which was the nearest town. Coming from our side the first thing you meet is a roundabout with 3 exits, one bringing you out the roads that bypass the town, one to the town centre, and one to a housing estate off the roundabout. As I joined the roundabout I met a woman driving against me on the roundabout taking a shortcut to her exit of the housing estate - frightened the shit outta 16 year old me, my dad was spooked too. I managed to make room enough for her to pass - she was oblivious. My dad actually knew her, lived there all her life, she must have driven that road 1000 times - how often was she taking that shortcut

Re: Safety benefits of roundabouts

#14
I'm not a traffic engineer, but I think roundabouts take more space than an equivalent signal or stop sign intersection. The article says that many places are starting to default to roundabouts, but many intersections are likely going to be difficult to upgrade.

Re: Safety benefits of roundabouts

#16
post #6

Earlier quoted context omitted.

As an American, I can assure you that we have loads of these

As a guy who actually read the article, I can assure everyone else that this American is right > In 2000, the U.S. only had 356 roundabouts. Over the past two decades, that number has grown to over 10,000.

My area, and a lot of others I think, are no longer building stop light intersections. Everything new is a roundabout.

Re: Safety benefits of roundabouts

#17
Interesting that there are no listed downsides. I saw a more balanced article a while back and recall that it listed cost (especially of the additional real estate, since roundabouts are larger) as being one downside. And in built-up cities, it's basically impossible to convert traditional intersections to roundabouts, because there's simply no room.

It is nice to not have to pay for replacement signals, or have to deal with power outages that kill the signals though.

Re: Safety benefits of roundabouts

#18
post #9
post #6

Earlier quoted context omitted.

As a guy who actually read the article, I can assure everyone else that this American is right > In 2000, the U.S. only had 356 roundabouts. Over the past two decades, that number has grown to over 10,000.

Less than half the 25,000 in UK, or just over half the 19,000 in Italy, or almost matching the 15,000 in Spain. It's great news all over that the number is clearly increasing, but still a very long long way to go until it becomes widespread.

To put things into perspective: 65 million + 60 million + 45 milion = 170 million people, about half of the US population.

So 59 000 roundabouts for half the population versus 10 000 in the US.

That's a deficit of 90% per capita :-)

Re: Safety benefits of roundabouts

#19
post #9
post #6

Earlier quoted context omitted.

As a guy who actually read the article, I can assure everyone else that this American is right > In 2000, the U.S. only had 356 roundabouts. Over the past two decades, that number has grown to over 10,000.

Less than half the 25,000 in UK, or just over half the 19,000 in Italy, or almost matching the 15,000 in Spain. It's great news all over that the number is clearly increasing, but still a very long long way to go until it becomes widespread.

Indeed, wasn't until 2011 or so until I saw my first roundabout in the USA.

For my other Americans, read the Australian's post above. Can get across an entire town without stopping as a reason to remake our towns with roundabouts.

Re: Safety benefits of roundabouts

#20
The greatest thing about roundabouts is that they protect against the idiot that goes through an intersection at full speed. He does that either because he is passed out behind the wheel or because he did not notice a stop sign and thought he had the right of way, or maybe because he just does not care.

Well with a roundabout if you just go straight ahead you hit the center circle. Good roundabouts always have a slight hill and some kind of barrier (a tree or some kind of statue) in the center so that the guy that just goes straight through will hit something in the center and wont come out the other side and will thus be less likely to kill an innocent person.

Single lane roundabouts are usually a good idea if the cost justifies it. Double and more lane roundabouts probably should be avoided in the US; they include rather obscure rules as to which lane you are allowed to drive in at any moment and americans do not like to learn new rules.

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