Traffic circles (roundabouts) in your area

[tradephoric]

Kittleson & Associates, Inc. also has a database file that you could use as well: http://roundabouts.kittelson.com/Roundabouts/List/US The site includes a Google Earth KML file you can download.

The Kittleson & Associates file has 2,334 entries and includes modern roundabouts, traffic circles, and neighborhood traffic circles.  My file has over 5,100 entries but focuses on just modern roundabouts.  So pick for yourself which file would be useful to you (or just download both).  It would be useful for K&A to separate out the KML file by the different types of circles so users can just focus on the circles that they are interested in.

[johndoe]

Holy cow trade, that file looks like a lot of work!  Out of curiosity, do you do traffic engineering for pay or just out of interest?

Speaking of routes with an abundance of roundabouts, check out portions of Carmel, IN.
https://goo.gl/maps/52kkF7Qetb92

[jakeroot]

Speaking of routes with an abundance of roundabouts, check out portions of Carmel, IN.
https://goo.gl/maps/52kkF7Qetb92

I believe Carmel is, unofficially, the Milton Keynes of the USA.

[tradephoric]

I'm in favor of roundabouts in general

it is increasingly clear you aren't - only being in favour of them in a few specific situations, and then if they are only a certain type (single-lane)

According to Kittelson and Associates, roughly 70% of the roundabouts in America are single-lane.  Of the multi-lane roundabouts, the 2x2 multi-lane roundabouts seem to be the ones that have questionable safety records (which makes up a small percentage of the multi-lane roundabouts).  Even then, I'm not saying don't build 2x2 multi-lane roundabouts.  There are plenty of reasons to build a roundabout besides the safety aspects.  But if we are going to be build these, let's find a way to make them as safe as possible.  Much of the "crash prone modern roundabout"  thread focused on solutions to making the 2x2 roundabouts safer (effects of central island diameter, using raised truck aprons for spiral roundabouts as opposed to just paving markings, proper signage to use, etc.).  I'm not an ideologue who supports every roundabout in America, but I'd say I support the majority of the roundabouts that have been constructed.   

I did appreciate your post english si.  You took on the challenge of finding a cluster of roundabouts in Milton Keynes and I especially liked the cluster of 6 roundabouts in 0.2 miles.  I have never been to that part of the world but would love to experience the redonkulousness of MK! 

[tradephoric]

Holy cow trade, that file looks like a lot of work!  Out of curiosity, do you do traffic engineering for pay or just out of interest?

This is mainly out of interest, though i do have some experience in the field.  I tweaked the file to add timestamp data to make a video showing the evolution of roundabouts in America the lower 48 since 1990.

https://www.youtube.com/watch?v=S4JTYxsYiXU

Yes, there are roundabouts in Hawaii and Alaska, i was just feeling lazy and didn't include them in the video. 

[noelbotevera]

The closest to me is 55 miles away in Frederick, Maryland. US 15 and MD 464.

[TravelingBethelite]

There's a pretty new one at the junction of CT 82 & 85 in Salem, Connecticut.

[tradephoric]

The closest to me is 55 miles away in Frederick, Maryland. US 15 and MD 464.

How bout this one in Cearfoss, Maryland?  It's only about 18 miles from Chambersburg.

https://www.google.com/maps/@39.70013,-77.77569,347m/data=!3m1!1e3

[noelbotevera]

The closest to me is 55 miles away in Frederick, Maryland. US 15 and MD 464.

How bout this one in Cearfoss, Maryland?  It's only about 18 miles from Chambersburg.

https://www.google.com/maps/@39.70013,-77.77569,347m/data=!3m1!1e3

I've never gone to that - I really have no reason to, so that's why I used Frederick, cause I remember that one. But hey, it counts.