AARoads Forum

Please login or register.

Login with username, password and session length

Author Topic: Does this interchange type exist anywhere else?  (Read 3433 times)

1

  • *
  • Online Online

  • Posts: 7270
  • UMass Lowell student

  • Age: 20
  • Location: MA/NH border
  • Last Login: Today at 08:17:22 AM
    • Flickr account
Does this interchange type exist anywhere else?
« on: April 25, 2016, 03:54:42 PM »

This interchange seems extremely simple, but it seems like this isn't found anywhere else.



This image uses the Google Maps API.

(For reference, this is in Massachusetts. I-93 is marked, and the dashed line at the top right corner is the MA/NH border.)
Logged
Clinched

Traveled, plus
US ⒔50
MA ⒐2⒉40.9⒐10⒎10⒐1⒒1⒚14⒈159
NH 27, 111A(E); NY 366; GA 42, 140; FL A1A; CT 32; VT 5A; QC 16⒉16⒌263

Flickr

froggie

  • *
  • Offline Offline

  • Posts: 10801
  • Location: Greensboro, VT
  • Last Login: October 15, 2019, 09:14:27 AM
    • Froggie's Place
Re: Does this interchange type exist anywhere else?
« Reply #1 on: April 25, 2016, 04:01:15 PM »

None that I know of.  Nor is such a design encouraged due to the weaving issues caused by the two ramps merging and diverging.
Logged

NE2

  • *
  • Offline Offline

  • Posts: 13883
  • fuck

  • Age: 11
  • Location: central Florida
  • Last Login: October 15, 2019, 07:15:26 AM
Re: Does this interchange type exist anywhere else?
« Reply #2 on: April 25, 2016, 04:27:18 PM »

SR 60 at SR 589 in Tampa was a squished version with left exits: http://ufdc.ufl.edu/UF00071755/00028/14x

There are probably some in countries like the UK that have a bunch of roundabouts.
Logged
Florida route log | pre-1945
I will do my best to not make America hate again.
Global warming denial is barely worse than white privilege denial.

Mapmikey

  • *
  • Offline Offline

  • Posts: 2727
  • Co-curator with Froggie of www.vahighways.com

  • Age: 49
  • Last Login: October 15, 2019, 10:26:58 PM
    • Co-curator Virginia Highways Project
Re: Does this interchange type exist anywhere else?
« Reply #3 on: April 25, 2016, 04:28:49 PM »

I'm sure weaving occurs in practice but theoretically there is only 1 lane between ramp converge/diverge.  The ramp from 93 SB is supposed to yield to the ramp from 213 WB...

But I am also drawing a blank on anywhere that does this in a simplistic interchange like that...
Logged

lordsutch

  • *
  • Offline Offline

  • Posts: 1054
  • Last Login: March 28, 2019, 10:31:40 AM
Re: Does this interchange type exist anywhere else?
« Reply #4 on: April 25, 2016, 04:52:34 PM »

There are probably some in countries like the UK that have a bunch of roundabouts.

Apropos this, the M32 at M4 interchange is effectively like this (although obviously a lower-speed affair, being a roundabout). More surprisingly, M5 at M50 isn't (although it was downgraded from a free-flow interchange to provide access to/from the south for no particular reason, apparently).
« Last Edit: April 25, 2016, 07:16:27 PM by lordsutch »
Logged

Sykotyk

  • *
  • Offline Offline

  • Posts: 874
  • Last Login: February 03, 2019, 02:49:05 AM
Re: Does this interchange type exist anywhere else?
« Reply #5 on: April 25, 2016, 06:16:05 PM »

One overpass and the weaving, etc is gone. Seems like the 213 ramps were done by the state on the cheap.
Logged

shadyjay

  • *
  • Offline Offline

  • Posts: 1200
  • Age: 41
  • Location: Lwr CT River Valley
  • Last Login: October 15, 2019, 04:38:37 PM
Re: Does this interchange type exist anywhere else?
« Reply #6 on: April 25, 2016, 09:15:29 PM »

Mass. has a love affair with rotaries.  This is as close as you can get to a full rotary with a freeway-to-freeway connection.
Logged
My FLICKR page has gone PRO!  Road photos (and more) from throughout the Northeast...
https://www.flickr.com/photos/shadyjay/collections/72157657234163953/

Kacie Jane

  • *
  • Offline Offline

  • Posts: 1675
  • Age: 34
  • Location: Kent, WA
  • Last Login: October 15, 2019, 09:03:58 PM
Re: Does this interchange type exist anywhere else?
« Reply #7 on: April 26, 2016, 04:33:44 PM »

I'm sure weaving occurs in practice but theoretically there is only 1 lane between ramp converge/diverge.  The ramp from 93 SB is supposed to yield to the ramp from 213 WB...

Are you sure that's correct? It seems counterintuitive to me.  If it were a cloverleaf weave, entering traffic (from 213 WB) would yield to exiting traffic (from 91 SB).
Logged

jakeroot

  • *
  • Offline Offline

  • Posts: 10288
  • U/Wash - Urban Design

  • Age: 23
  • Location: Seattle and Tacoma, WA Vancouver, BC | Arlington, VA
  • Last Login: Today at 02:56:02 AM
Re: Does this interchange type exist anywhere else?
« Reply #8 on: April 26, 2016, 05:53:28 PM »

I'm sure weaving occurs in practice but theoretically there is only 1 lane between ramp converge/diverge.  The ramp from 93 SB is supposed to yield to the ramp from 213 WB...

Are you sure that's correct? It seems counterintuitive to me.  If it were a cloverleaf weave, entering traffic (from 213 WB) would yield to exiting traffic (from 91 SB).

I think the interchange is meant to resemble a typical rotary, hence the yield signs for traffic exiting 93 SB: https://goo.gl/mTbVkE.
Logged

Truvelo

  • *
  • Offline Offline

  • Posts: 1741
  • Speed limits limit life

  • Age: 42
  • Location: United Kingdom
  • Last Login: Today at 07:34:31 AM
Re: Does this interchange type exist anywhere else?
« Reply #9 on: April 26, 2016, 05:57:27 PM »

One was planned in the UK exactly like the I-93 example in the original post. This map is from 1970 but it was eventually built 20 years later as a roundabout.

Logged
Speed limits limit life

bzakharin

  • *
  • Offline Offline

  • Posts: 1545
  • Last Login: October 15, 2019, 08:44:03 PM
Re: Does this interchange type exist anywhere else?
« Reply #10 on: April 26, 2016, 05:58:09 PM »

There is something similar in spirit, though a lot more complicated, going on here:
https://www.google.com/maps/@40.5266846,-74.3370103,16z
Logged

noelbotevera

  • *
  • Offline Offline

  • Posts: 2993
  • Now at a Redbox kiosk near you!

  • Age: 15
  • Location: Chambersburg, Pennsylvania
  • Last Login: Today at 06:56:21 AM
Re: Does this interchange type exist anywhere else?
« Reply #11 on: April 26, 2016, 07:39:00 PM »

Do you mind if you can clarify the movements? I can't quite make heads or tails about it.

I'm not quite sure if that's what you're looking for, but I'll see if I can't dig up something more of what you're asking for.
Logged
Doing things that nobody wants to do since 2004.
I was THE youngest forum member from May 14th, 2015 to September 25th, 2016.

I am the second Alex, since I currently use my father's name...

webfil

  • *
  • Offline Offline

  • Posts: 325
  • I thought being taught would be tough, though.

  • Age: 31
  • Location: Matane, QC, Canada
  • Last Login: October 15, 2019, 09:18:49 PM
    • Le livre noir de la vie en Basse-Ville
Re: Does this interchange type exist anywhere else?
« Reply #12 on: April 26, 2016, 10:27:51 PM »

Logged

SectorZ

  • *
  • Offline Offline

  • Posts: 972
  • Age: 41
  • Location: Tewksbury, MA
  • Last Login: October 15, 2019, 08:19:13 PM
Re: Does this interchange type exist anywhere else?
« Reply #13 on: April 27, 2016, 08:33:04 AM »

I'm sure weaving occurs in practice but theoretically there is only 1 lane between ramp converge/diverge.  The ramp from 93 SB is supposed to yield to the ramp from 213 WB...

Are you sure that's correct? It seems counterintuitive to me.  If it were a cloverleaf weave, entering traffic (from 213 WB) would yield to exiting traffic (from 91 SB).

As someone who has driven through this dozens of times, I can confirm the traffic entering from 93 S/B is supposed to yield. Most don't, but that's the traffic obligated to yield entering.
Logged

1995hoo

  • *
  • Offline Offline

  • Posts: 10359
  • Age: 46
  • Location: Fairfax County, Virginia
  • Last Login: October 15, 2019, 07:37:56 PM
Re: Does this interchange type exist anywhere else?
« Reply #14 on: April 27, 2016, 09:36:29 AM »

There are probably some in countries like the UK that have a bunch of roundabouts.

Apropos this, the M32 at M4 interchange is effectively like this (although obviously a lower-speed affair, being a roundabout). More surprisingly, M5 at M50 isn't (although it was downgraded from a free-flow interchange to provide access to/from the south for no particular reason, apparently).

I've driven through the M32/M4 one. Once upon a time it was a full roundabout, but by 2007 they'd blocked off the southwest side and it's now essentially a teardrop (M4 traffic cannot use it to reverse direction). If you look at the satellite view you'll see the closed-off piece.


(Edited to fix typo)
« Last Edit: April 27, 2016, 09:57:04 AM by 1995hoo »
Logged
"You know, you never have a guaranteed spot until you have a spot guaranteed."
—Olaf Kolzig, as quoted in the Washington Times on March 28, 2003,
commenting on the Capitals clinching a playoff spot.

"That sounded stupid, didn't it?"—Kolzig, to the same reporter a few seconds later.

english si

  • *
  • Offline Offline

  • Posts: 3535
  • Age: 33
  • Location: Buckinghamshire, England
  • Last Login: October 15, 2019, 01:00:58 PM
Re: Does this interchange type exist anywhere else?
« Reply #15 on: April 27, 2016, 09:39:21 AM »

More surprisingly, M5 at M50 isn't (although it was downgraded from a free-flow interchange to provide access to/from the south for no particular reason, apparently).
They removed the free-flow as 1960-spec trumpet loop was dangerous (capsized lorries galore), and the weaving between the sliproads for the services and the junction was bad.

The south-facing sliproads of the service area merge into the north-facing sliproads of the junction, hence why the junction doesn't look like this sort of one with a teardrop shape.


The M27/M271 roundabout was proposed to be a modified one (southern side of the roundabout closing, just like the M4/M32 one), but that was so controversial that the proposal was never formalised.
Logged

 


Opinions expressed here on belong solely to the poster and do not represent or reflect the opinions or beliefs of AARoads, its creators and/or associates.