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September 07, 2010


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Well, this is an extremely bad traffic arrangement design overall that is opposite to simple safe road design rules, see "Sustainable safe road design: a practical manual" ( This manual gives a good strategy to solve these kind of problems.
The root cause in this situation is land-use within interchange (between I-95 and ramps). As building is very close to I-95, this root cause cannot be eliminated without relocating the building, so something else must be figured out. I could do some sketching.

i would put a roundabout there. no more traffic lights, less accidents (proven!) and a chance to undo your mistakes.

it is unfortunate that north america has not picked up on something that solves so many problems in europe... ;)

Thanks for the reference.  I dont know that there are any thoughts to do something to address the condition so only share your ideas if your interested in the thought experiment.  I am curious what existing patterns there are as this might be difficult to address after construction.  Ive heard of traffic simulations but Im not sure how advanced they are in exposing issues like this.  It should be easy to write a program that mimicked user perceptions.

Its ironic as Massachusetts has more roundabouts than anywhere in the U.S.  Connecticut where I grew up has almost none while right next door Mass has many.  They do cause issues though since out of state drivers arent sure of the rules or how to navigate them.  Its a case of a pattern being implemented in a limited fashion.  It needs to be more common to be effective.  Regardless they do slow people down and minimize dangerous accidents.

Ah now whats needed here is a Magic Roundabout.

That is amazing.  Im intrigued but Im not sure a typical American driver would make of this.  Sadly they might prefer an eyesore or ramps and underpasses instead.  Thanks for sharing that link.  Truly fascinating.

To show you how common this failure is, here is video from this morning:

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