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Smallest Radii on loop ramp

Started by johndoe, November 27, 2012, 07:02:33 PM

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TheStranger

#27
November 28, 2012, 08:05:00 PM  
Here's a nasty cloverleaf ramp in Rosemead, at the junction of Interstate 10/San Bernardino Freeway and Route 19/Rosemead Boulevard:

https://maps.google.com/maps?q=Rosemead+Blvd+%26+Glendon+Way&hl=en&ll=34.073119,-118.073545&spn=0.004795,0.004753&sll=34.073038,-118.073249&sspn=0.00241,0.002376&t=h&hnear=Rosemead+Blvd+%26+Glendon+Way,+Rosemead,+Los+Angeles,+California+91770&z=18

Another one on I-10 further west, at Atlantic Boulevard in Alhambra:
https://maps.google.com/maps?q=Glendon+Way+%26+Atlantic+Blvd&hl=en&ll=34.071183,-118.134367&spn=0.000426,0.000594&sll=34.071396,-118.131351&sspn=0.027266,0.038023&hnear=S+Atlantic+Blvd+%26+W+Glendon+Way,+Alhambra,+Los+Angeles,+California+91803&t=m&z=21&layer=c&cbll=34.071183,-118.134367&panoid=w_UfY3Un-PLcNdBMG83Rrg&cbp=12,134.81,,0,4.67

These are two of seven straight tiny-ramp-cloverleaf interchanges between Exit 23A and Exit 26B.  Ouch.

Further west in metro Los Angeles, is this interchange constrained by the Los Angeles River, Interstate 710/Long Beach Freeway at Willow Street in Long Beach:
https://maps.google.com/maps?q=Willow+Street+%26+Long+Beach+Freeway&hl=en&ll=33.804122,-118.20699&spn=0.006802,0.009506&sll=33.804603,-118.207353&sspn=0.003419,0.004753&hnear=W+Willow+St+%26+Long+Beach+Fwy,+Long+Beach,+Los+Angeles,+California+90810&t=h&z=17

15 MPH advisory speed there!

Also in Long Beach is the junction of Route 103 and Route 1, with a 20 MPH advisory speed for the loop from Route 103 south to Route 1 south:
https://maps.google.com/maps?q=Terminal+Island+Fwy+%26+Pacific+Coast+Hwy&hl=en&ll=33.789349,-118.22436&spn=0.006803,0.009506&sll=33.789839,-118.22481&sspn=0.004836,0.004753&t=h&hnear=W+Pacific+Coast+Hwy+%26+Terminal+Island+Fwy,+Long+Beach,+Los+Angeles,+California+90813&z=17

Chris Sampang

Sanctimoniously

#28
November 28, 2012, 08:49:22 PM  
I remembered this being a little tighter and slower. Thomas Road (LA 617) at I-20 (specifically, WB I-20 to NB LA 617), West Monroe, LA
Quote from: Scott5114 on December 22, 2013, 06:27:29 AM
[tt]wow                 very cringe
        such clearview          must photo
much clinch      so misalign         wow[/tt]

See it. Live it. Love it. Verdana.

jp the roadgeek

#29
November 28, 2012, 08:56:17 PM  
Couple I can think of off the top of my head:

I-684 N to I-84 E ramp in Brewster, NY:. Not a full cloverleaf, but the 20 MPH curve just before the merge onto 84 is almost at a right angle, and is very deceptive.  If you don't make the curve, you're going perpendicular across the lanes of heavy 84 traffic.

Several on the Merritt/Wilbur Cross Parkways in CT, but the sharpest has to be the Exit 61 NB off ramp onto Whitney Ave. You basically go 175 degrees on a hairpin in about 75 ft.
Interstates I've clinched: 97, 290 (MA), 291 (CT), 291 (MA), 293, 295 (DE-NJ-PA), 295 (RI-MA), 384, 391, 395 (CT-MA), 395 (MD), 495 (DE), 610 (LA), 684, 691, 695 (MD), 695 (NY), 795 (MD)

MASTERNC

#30
November 28, 2012, 09:17:26 PM  

cpzilliacus

#31
November 28, 2012, 09:19:20 PM  
Opinions expressed here on AAROADS are strictly personal and mine alone, and do not reflect policies or positions of MWCOG, NCRTPB or their member federal, state, county and municipal governments or any other agency.

Urban Prairie Schooner

#32
November 28, 2012, 09:19:57 PM  
Scenic Highway/Airline Highway interchange (US 61 and 190) in north Baton Rouge when nearly brand new in 1941, more or less unchanged to this day:

http://www.flickr.com/photos/77396241@N02/8227839607/in/photostream

Alps

#33
November 28, 2012, 09:32:46 PM  

TheStranger

#34
November 28, 2012, 11:58:48 PM  
Quote from: Urban Prairie Schooner on November 28, 2012, 09:19:57 PM
Scenic Highway/Airline Highway interchange (US 61 and 190) in north Baton Rouge when nearly brand new in 1941, more or less unchanged to this day:

http://www.flickr.com/photos/77396241@N02/8227839607/in/photostream

What's crazy about that: Looked to be a LOT of available land for a better layout back then!  Seems like preservation of the Monte Sano Avenue alignment was the priority in that design.

Chris Sampang

kurumi

#35
November 29, 2012, 02:10:27 AM  
Page Mill Road at Alma Street, Palo Alto, CA: radius == about 25 meters: http://goo.gl/maps/fHRa0
My first SF/horror short story collection is available: "Young Man, Open Your Winter Eye"

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jeffandnicole

#36
November 29, 2012, 08:19:00 AM  
I-295, Interchanges 15 & 16A both have very tight radii and 15mph advisory speeds.

Aerial Image: http://goo.gl/maps/jlp1I

Road Image: (Exit 15): http://goo.gl/maps/ILEZm , (Exit 16A): http://goo.gl/maps/CX8R5 (and the one and only sign is after the ramp leaves the mainline!)

kphoger

#38
November 29, 2012, 07:58:13 PM  
Quote15 MPH

Wichita has one on a highway that sometimes carry trucks with three trailers.

One of my favorites is in St Joseph, MO.
He Is Already Here! Let's Go, Flamingo!
Dost thou understand the graveness of the circumstances?
Deut 23:13
Male pronouns, please.

Quote from: PKDIf you can control the meaning of words, you can control the people who must use them.

flowmotion

#39
November 29, 2012, 08:47:23 PM  
There used to be a very tight cloverleaf on MN-280 @ E Hennepin / Larpenteur. Can't recall if it was signed for 10 or 15 MPH. It has been since converted to a diamond.

http://www.historicaerials.com/aerials.php?scale=1.21620670801354E-5&lat=44.9925171908712&lon=-93.2056890071378&year=2004

Mr. Matté

#40
November 30, 2012, 08:50:33 AM  
This has got to be one of the tightest loops at least to stay on a main-line interstate, and from the looks of the construction, it's going to be even tighter:
https://maps.google.com/?ll=35.125297,-90.066226&spn=0.001893,0.003484&t=h&z=19
I-55 in Memphis

empirestate

#41
December 01, 2012, 12:56:25 AM  
Look at all y'all with your spacious fancy ramps!
http://goo.gl/maps/C9Z6z

In New York we got ramps so tight, they're invisible!
http://goo.gl/maps/UaJQa

Roadsguy

#42
December 01, 2012, 09:39:45 AM  
Quote from: Mr. Matté on November 30, 2012, 08:50:33 AM
This has got to be one of the tightest loops at least to stay on a main-line interstate, and from the looks of the construction, it's going to be even tighter:
https://maps.google.com/?ll=35.125297,-90.066226&spn=0.001893,0.003484&t=h&z=19
I-55 in Memphis

Maybe temporarily, but they're fixing that interchange. Two lane ramps, no more loops for I-55, and other fixes. Check the website. (I forget the URL.)
Mileage-based exit numbering implies the existence of mileage-cringe exit numbering.

JREwing78

#43
December 01, 2012, 04:02:08 PM  
Three winners from Burlington, WI - all posted for 10mph advisory speeds. This is on a recently-built highway, too:
http://goo.gl/maps/P0bgv
http://goo.gl/maps/Nb7Sb
http://goo.gl/maps/cnKkF

Granted, it's not an interstate or even technically a freeway, and these entrances and exits are basically RIRO arrangements.

kphoger

#44
December 02, 2012, 07:22:03 PM  
Functionally, though, they are still basically parclos.  OTOH, their low speed rating is not due to their radii so much as their intersection points–unless you measure the radius at the intersection point (as in a completely square corner yielding a radius of zero, and a slightly curved RIRO yielding a very small one).
He Is Already Here! Let's Go, Flamingo!
Dost thou understand the graveness of the circumstances?
Deut 23:13
Male pronouns, please.

Quote from: PKDIf you can control the meaning of words, you can control the people who must use them.

PHLBOS

#46
December 12, 2012, 04:35:18 PM   Last Edit: December 12, 2012, 04:40:24 PM by PHLBOS
Quote from: deathtopumpkins on November 28, 2012, 10:04:52 AM
Watch and learn, rest of the country:

http://goo.gl/maps/ZT07B MA 128/1A
http://goo.gl/maps/WH14G MA 128/35 (note, reconstructed as a diamond, opened this summer)
http://goo.gl/maps/rDLC7 MA 128/Lowell St
http://goo.gl/maps/OpFPR US 1/Walnut St
http://goo.gl/maps/KrlFK US 1/Main St
http://goo.gl/maps/0qGzM US 1/Essex St
http://goo.gl/maps/O3nQX US1/Salem St (this one's a bit of a stretch)
http://goo.gl/maps/vl8cL Riverway/Jamaicaway/MA 9
http://goo.gl/maps/PWVE8 MA 9/Weston Rd
http://goo.gl/maps/7CBBU MA9/27
http://goo.gl/maps/Jo1Pn MA9/30/126 (this one's also a bit of a stretch)
http://goo.gl/maps/cxtZN MA9/85
http://goo.gl/maps/n10yq MA146/Elm St
http://goo.gl/maps/RN7DQ MA2/12
Add MA 107/114 (although the loop ramp from MA 107 North to MA 114 West was recently eliminated due to the erection of a new building (District Court Building (?))) and the US 1/PA 352 cloverleaf into the mix as well.

Prior to 1988, the MA 128/Lowell St. interchange used to have a tight loop ramp from the northbound 128 direction.
GPS does NOT equal GOD

Bickendan

#47
December 13, 2012, 02:03:49 AM  
Quote from: empirestate on December 01, 2012, 12:56:25 AM
Look at all y'all with your spacious fancy ramps!
http://goo.gl/maps/C9Z6z

In New York we got ramps so tight, they're invisible!
http://goo.gl/maps/UaJQa

Again, I'll submit the CA 110 one -- it has a stop sign at the end of the ramp! http://goo.gl/maps/QXLWF

roadman65

#48
December 21, 2012, 11:21:53 AM  
Every day is a winding road, you just got to get used to it.

Sheryl Crowe

roadman

#49
December 21, 2012, 12:35:49 PM  
Of all the tight loop ramps in Massachusetts that deathtopumpkins listed, the ramp from US 1 north to Walnut Street north in Saugus, IMO, is by far the worst.  You have to slow down almost to a complete stop (not easy to do on that section of US 1) before you enter the ramp.
"And ninety-five is the route you were on.  It was not the speed limit sign."  - Jim Croce (from Speedball Tucker)

"My life has been a tapestry
Of years of roads and highway signs" (with apologies to Carole King and Tom Rush)
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