AARoads Forum

National Boards => General Highway Talk => Topic started by: johndoe on September 16, 2018, 08:57:13 AM

Title: variation of offset single point interchange
Post by: johndoe on September 16, 2018, 08:57:13 AM
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRIsMDXo86op-a0jFOz_s04QWZiX-NJ20u5RodTg5F3xi8KPuVEjg)

Interesting presentation about a job in New Mexico: https://www.westernite.org/annualmeetings/16_Albuquerque/Presentations/3D_Hinckley.pdf
Title: Re: variation of offset single point interchange
Post by: NE2 on September 16, 2018, 08:06:11 PM
This is functionally equivalent to an interchange in Pittsburgh: http://www.google.com/maps/@40.4141769,-80.0098988,17z
Title: Re: variation of offset single point interchange
Post by: johndoe on September 16, 2018, 10:17:46 PM
Quote from: NE2 on September 16, 2018, 08:06:11 PM
This is functionally equivalent to an interchange in Pittsburgh: http://www.google.com/maps/@40.4141769,-80.0098988,17z
Cool example, they really squeezed that one in!

It is pretty darn similar, although the New Mexico version makes the signal more efficient by allowing one of the off-ramp lefts to proceed at the same time as the on-ramp "right" (loop)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.i25riobravo.com%2Fwp-content%2Fuploads%2FWebsiteChanges1-2.jpg&hash=124297c7194ee6e67a9d1c886cfa9941af48b54c)
(see slide 18/28 in the first link ... phases 2 and 7)
...I just thought of how many northbound rights (labeled phase 1) will make the right turn into the adjacent lanes and end up back on the freeway in the same direction they just exited ha!  I wonder how they'll sign that...
Title: Re: variation of offset single point interchange
Post by: webny99 on September 17, 2018, 10:42:01 AM
Reminds me a lot of this interchange (https://www.google.com/maps/@43.1138527,-77.6253432,16.27z/data=!5m1!1e1). Basically, the only difference is that, in the case of I-390/NY 15, the southbound off-ramp requires using East River Road, which is a two-way surface street. Also, the bottom half is partially combined with the NY 15A interchange, which makes comparing a little complicated.

Quote from: johndoe on September 16, 2018, 10:17:46 PM
It is pretty darn similar, although the New Mexico version makes the signal more efficient by allowing one of the off-ramp lefts to proceed at the same time as the on-ramp "right" (loop)

Yeah, that's the other difference compared to the one I linked as well. Other than that, it's functionally pretty much the same.
Title: Re: variation of offset single point interchange
Post by: Mark68 on September 18, 2018, 06:55:19 PM
I-225 and Alameda Ave in Aurora, CO.

https://goo.gl/maps/eCtnLN1ySpq
Title: Re: variation of offset single point interchange
Post by: NE2 on September 18, 2018, 08:13:35 PM
Quote from: Mark68 on September 18, 2018, 06:55:19 PM
I-225 and Alameda Ave in Aurora, CO.

https://goo.gl/maps/eCtnLN1ySpq
What about it?
Title: Re: variation of offset single point interchange
Post by: Mark68 on September 19, 2018, 01:48:16 PM
Quote from: NE2 on September 18, 2018, 08:13:35 PM
Quote from: Mark68 on September 18, 2018, 06:55:19 PM
I-225 and Alameda Ave in Aurora, CO.

https://goo.gl/maps/eCtnLN1ySpq
What about it?

Offset single-point interchange. That belongs in this thread, right?
Title: Re: variation of offset single point interchange
Post by: NE2 on September 19, 2018, 09:55:38 PM
Quote from: Mark68 on September 19, 2018, 01:48:16 PM
Quote from: NE2 on September 18, 2018, 08:13:35 PM
Quote from: Mark68 on September 18, 2018, 06:55:19 PM
I-225 and Alameda Ave in Aurora, CO.

https://goo.gl/maps/eCtnLN1ySpq
What about it?

Offset single-point interchange. That belongs in this thread, right?

This thread is about a variation of one.
Title: Re: variation of offset single point interchange
Post by: lordsutch on September 20, 2018, 02:11:06 PM
Quote from: johndoe on September 16, 2018, 10:17:46 PM
...I just thought of how many northbound rights (labeled phase 1) will make the right turn into the adjacent lanes and end up back on the freeway in the same direction they just exited ha!  I wonder how they'll sign that...

I think striping would probably be the best way to communicate that idea, with dashed lines on both sides of the lane going diagonally across the east-to-north roadway. A turn restriction could be added later if that doesn't work.