Here is the location: http://goo.gl/maps/vxpfy
I'm curious if any of you know more history behind this. According to historicaerials.com this geometry was built between 1955 and 1963. I'm surprised this geometry wasn't replicated in our country for another 50 years. (Of course this is a partial example but I am still considering it a "DDI" because of the west signalized crossover). Are there any more of these around R.I., etc?
No way is this a DDI. (But I don't count what are referred to as DDIs where the surface road only goes one way - those are pointlessly equivalent to diamonds.)
Quote from: johndoe on April 22, 2015, 07:25:40 AM
Here is the location: http://goo.gl/maps/vxpfy
I'm just getting a generic high-level map with the link.
He's referring to this (https://maps.google.com/maps?q=Thurbers+Avenue,+Providence,+RI&hl=en&ll=41.800303,-71.403698&spn=0.002475,0.005681&sll=41.78782,-71.394313&sspn=0.079228,0.181789&oq=Thurbers&gl=us&hnear=Thurbers+Ave,+Providence,+Rhode+Island+02905&t=m&z=18).
Close, but not quite a DDI. There's no westbound through movement that crosses over and again. It might be considered a forerunner to the DDI, but not a DDI.
Along the same lines...
https://www.google.com/maps/@39.15618,-76.74527,306m/data=!3m1!1e3
The first DDI in the US was I-44 at MO-13.