Hello,
I happened to thought of this topic. I noticed that we all have some interstate to interstate junctions that contains 25-50 mph sharp curves (loop ramps for an interstate do count). I thought if you guys know of any I-XX to I-XX, I-XX to I-XXX, or I-XXX to I-XXX junctions that have them. Feel free to post up map(s) if there are any. A few great examples are:
I-80/I-84 interchange near Echo, UT: I-80 takes a 50 mph sharp curve through the interchange; From I-80 West to I-84 West takes 50 mph sharp curve going northwest; and I-84 East to I-80 East takes 45 mph curve, while from I-84 East to I-80 West takes a 35 mph sharp curve.
I-81/I-86/NY 17 interchange in Binghamton, NY: I-81 in both directions takes a 50 mph sharp curve throughout the interchange. I-81 North to I-86/NY 17 West takes a 50 mph curve, and from I-86/NY 17 East to I-81 South multiplex takes a 50 mph sharp curve first before merging with.
Lastly, in my hometown, I-73 North takes a 25 mph loop ramp curve at I-85/US 421 interchange to continue on I-73 North. (IMO, that loop ramp should have been a flyover.)
Any other examples?
I feel like this has general topic been covered multiple times previously
Heck, there are Thru Interstates that TOTSO using tight loop ramps.
Thru I-80 East transitioning from the Borman Expressway to the Indiana Toll Road is an example, via a Trumpet Loop Ramp
Thru I-80 East and I-74 West both use Cloverleaf Loop Ramps at their "bump" in Illinois
Thru I-72 West in Springfield, IL uses a Cloverleaf Loop Ramp
Thru I-55 North uses a Cloverleaf Loop Ramp in Memphis
Quote from: ilpt4u on May 03, 2020, 01:39:27 PM
I feel like this has general topic been covered multiple times previously
Heck, there are Thru Interstates that TOTSO using tight loop ramps.
Thru I-80 East transitioning from the Borman Expressway to the Indiana Toll Road is an example, via a Trumpet Loop Ramp
Thru I-80 East and I-74 West both use Cloverleaf Loop Ramps at their "bump" in Illinois
Thru I-72 West in Springfield, IL uses a Cloverleaf Loop Ramp
Thru I-55 North uses a Cloverleaf Loop Ramp in Memphis
This thread is about 90° curves, not 270° curves.
Quote from: 1 on May 03, 2020, 01:41:04 PM
This thread is about 90° curves, not 270° curves.
The OP referenced Thru I-73 North utilizing a Cloverleaf Loop Ramp in Greensboro
If I were to do a small wager, more I-I ramps are 50 mph or less, than are 55 mph or greater.
Quote from: ilpt4u on May 03, 2020, 01:39:27 PM
I feel like this has general topic been covered multiple times previously
Heck, there are Thru Interstates that TOTSO using tight loop ramps.
Thru I-80 East transitioning from the Borman Expressway to the Indiana Toll Road is an example, via a Trumpet Loop Ramp
Thru I-80 East and I-74 West both use Cloverleaf Loop Ramps at their "bump" in Illinois
Thru I-72 West in Springfield, IL uses a Cloverleaf Loop Ramp
Thru I-55 North uses a Cloverleaf Loop Ramp in Memphis
Yeah, this thread is mostly about on 90 degree curves. I do allow 270 degree curves because sometimes in some interchanges, 270 degree curve is considered a part of sharp curve (not often mentioned, but I do see it in the signages in some cities that provides an advanced warning of a 25 mph sharp curve like the one found at the southern I-93/I-95 interchange near Canton, MA.) I want to see more 90 degree curves examples.
So more along the lines of the ramp from I-57 North to I-74 East in Champaign, IL, which is heavily signed for a Ramp 30 MPH speed and has one of those Speed Monitors for traffic taking the exit?
Quote from: ilpt4u on May 03, 2020, 01:47:59 PM
Quote from: 1 on May 03, 2020, 01:41:04 PM
This thread is about 90° curves, not 270° curves.
The OP referenced Thru I-73 North utilizing a Cloverleaf Loop Ramp in Greensboro
Yeah, that does count. Like the one example found near the I-93/I-95 interchange with an advanced signage, which is why I do allow 270 degree curves if there is an advanced signage that warns the drivers.
https://www.google.com/maps/@42.2004747,-71.1442987,3a,75y,15.85h,89.02t/data=!3m6!1e1!3m4!1srBb_zBcPjnQDIf7PoJY1ew!2e0!7i16384!8i8192
The I-49 northbound TOTSO ramp near Fidelity MO is a cloverleaf.
The I-55 Southbound TOTSO is a 20MPH curve just after the Poplar St Bridge, and at that same junction I-70 had a 30 MPH TOTSO until it was rerouted to a new bridge further north.
Quote from: ozarkman417 on May 03, 2020, 02:09:51 PM
The I-55 Southbound TOTSO is a 20MPH curve just after the Poplar St Bridge, and at that same junction I-70 had a 30 MPH TOTSO until it was rerouted to a new bridge further north.
Speaking of that new bridge and the I-70 routing over it (Stan Musial Veterans Memorial Bridge, aka Stan Span)...
When on the Missouri Side, I-70 West from the Bridge to the preexisting Freeway (formerly Thru I-70, but now the East end of I-44) TOTSO with a signed 35 MPH ramp. Thru I-70 East TOTSO is signed 45 MPH
On the IL side at the I-64/I-70 Bump while I-55 continues Thru, the I-64 West to I-55 North/I-70 East Ramp is signed for 35 MPH with Yellow Caution Flashers. The ramp from I-55 South (I-70 West departed the Freeway just before this ramp) to I-64 East is signed for 25 MPH
The one that comes to mind for me is in Montgomery AL at the southern terminus of I-85 at I-65. For a flyover ramp this one has a rather low speed. The left exit for I-65 south towards Mobile is posted at 35 mph with a warning about trucks tipping over. This is likely due to that ramp not being banked very well, and having enough room for a higher speed flyover.
The attached picture only shows the speed limit for the right ramp to Day Street, also 35 mph; the speed limit sign for the left ramp is a few frames behind. If so inclined, you can see it with Google Street View.
(Picture is from AARoads archives)
(https://www.aaroads.com/al/085/i-085_sb_exit_000_09.jpg)
I-95/I-93 southern end
I-65/I-70 north split in Indianapolis has 40mph advisory speeds in all directions
Quote from: Strider on May 03, 2020, 01:50:48 PM
Yeah, this thread is mostly about on 90 degree curves. I do allow 270 degree curves because sometimes in some interchanges, 270 degree curve is considered a part of sharp curve (not often mentioned, but I do see it in the signages in some cities that provides an advanced warning of a 25 mph sharp curve like the one found at the southern I-93/I-95 interchange near Canton, MA.) I want to see more 90 degree curves examples.
Keeping in mind that if a 2di makes a turn from one route to another at a standard cloverleaf, there's going to
both a 270 degree curve in one direction
and a 90 degree curve in the other direction.
I-90 in Cleveland does a 90 (fitting!) degree turn at both ends of it's multiplex with OH 2.
The eastern end (https://www.google.com/maps/@41.6044803,-81.4941766,15.79z/data=!5m1!1e1) and the famous western end, known as Dead Man's Curve (https://www.google.com/maps/@41.5181485,-81.6734243,16.46z/data=!5m1!1e1).
I-495 Capitol Beltway at I-270 spur. I-495 Westbound curves with 50 mph to merge with the southern end of I-270 Spur. Not sure about the northbound I-495 one that is going to the east.
Just to the east of the location above: I-95 at I-495 northern split near College Park, MD: I-95 South has to take a 45 mph curve to merge with I-495 Eastbound traffic.
Other one: I-95 at I-695 near New York: I-95 North takes a 45 mph curve across I-695 to merge with I-695 north (I-695 ends at that interchange). Not sure about I-95 southbound ones however it looks like a sharp curve as well.
I-35W - 35 MPH curve at the south end of the I-94 commons in Minneapolis
I-94 - curve signed for 35 MPH eastbound, 40 MPH westbound in the Lowry Hill Tunnel
Steve Riner said MN 62 used to have a 20 MPH curve near MN 55 due to a protected native prairie patch.
I-465 Outer Indy Beltway transitioning from West to South at the NW corner junction with I-895, Thru I-465 Outer is signed with yellow flashers to take a 45 MPH Ramp and the interchange is designed more like I-465 Outer is TOTSO, with a Right Exit while I-865/former I-465 West/Glorified I-65 North Exit Ramp is signed and treated as the Thru Route on the Left Side
Quote from: ilpt4u on May 03, 2020, 05:36:05 PM
I-465 Outer Indy Beltway transitioning from West to South at the NW corner junction with I-895, Thru I-465 Outer is signed with yellow flashers to take a 45 MPH Ramp and the interchange is designed more like I-465 Outer is TOTSO, with a Right Exit while I-865/former I-465 West/Glorified I-65 North Exit Ramp is signed and treated as the Thru Route on the Left Side
The OP specifically stated "I-XX to I-XX", so I've been assuming he means only 2di highways can qualify.
WB I-70 → WB I-70 ... 35mph direct ramp (https://goo.gl/maps/UH6uPezXZmfMxSSJ9)
WB I-70 → SB I-35 ... 35mph indirect ramp (https://goo.gl/maps/8HwKhet99cS9hfdu6)
I found two 35 mph exits:
I-220 EB to I-20 EB in Bossier City, LA
I-10 EB to I-110 NB in Baton Rouge, LA
A 30mph exit from I-35W to SB I-35E in Denton, TX
And a 25 mph from EB I-410 to SB I-35 in San Antonio
iPhone
Quote from: kphoger on May 03, 2020, 09:20:37 PM
WB I-70 → WB I-70 ... 35mph direct ramp (https://goo.gl/maps/UH6uPezXZmfMxSSJ9)
Another one on the Kansas side (https://www.google.com/maps/@39.1136702,-94.6153937,3a,42.9y,295.98h,95.22t/data=!3m6!1e1!3m4!1sldnGCQ6rf4Hvlgt_KqAFPA!2e0!7i13312!8i6656?hl=en)
Junction of I-80 and I-81 (https://www.google.com/maps/place/41%C2%B034'27.0%22N+75%C2%B015'21.0%22W/@41.0451907,-76.0206704,15z/data=!4m5!3m4!1s0x0:0x0!8m2!3d41.574167!4d-75.255833?hl=en) near Hazleton, Pennsylvania has an assortment of very sharp ramps. Who in Sam Hill approved this design?
[Speeds are recommended maximum speeds as signed by PennDOT]
I-81 S to I-80 E (https://www.google.com/maps/@41.0456218,-76.0140332,3a,75y,203.28h,92.68t/data=!3m6!1e1!3m4!1sT6fWxgafg_lUZ-4pqTdL9Q!2e0!7i16384!8i8192?hl=en) (20 MPH);
I-80 E to I-81 S (https://www.google.com/maps/@41.0440578,-76.0201554,3a,75y,98.81h,86.31t/data=!3m6!1e1!3m4!1sGKouVvWhJMDhz1QQEUbpDg!2e0!7i13312!8i6656?hl=en) (30 MPH);
I-81 N to I-80 E (https://www.google.com/maps/@41.0436292,-76.0142631,3a,75y,41.32h,91.01t/data=!3m6!1e1!3m4!1sDX4t9ejNnbDPxDNUL5Jrrw!2e0!7i13312!8i6656?hl=en) (30 MPH);
I-80 E to I-81 N (https://www.google.com/maps/@41.0457778,-76.0116643,3a,75y,77.45h,84.36t/data=!3m6!1e1!3m4!1sFxJ10wKCWIF2dhyFyO0c4Q!2e0!7i16384!8i8192?hl=en) (left exit - 40 MPH);
I-80 W to I-81 N (https://www.google.com/maps/@41.0491673,-76.0040405,3a,26.3y,259.41h,92.55t/data=!3m6!1e1!3m4!1sqExntAGw2lPjek5eYAOM8Q!2e0!7i16384!8i8192?hl=en) (merges with ramp above - 20 MPH);
I-80 W to I-81 S (https://www.google.com/maps/@41.0471412,-76.0120924,3a,75y,271.14h,97.09t/data=!3m6!1e1!3m4!1skumk99wTiLGD9dnOfcUDqw!2e0!7i16384!8i8192?hl=en) (15 MPH);
I-81 S to I-80 W (https://www.google.com/maps/@41.0501301,-76.0102657,3a,75y,240.92h,90.67t/data=!3m6!1e1!3m4!1sEzE6mYRUNZlhDkQNc5E4Sw!2e0!7i16384!8i8192?hl=en) (40 MPH); and
I-81 S to I-80 E (https://www.google.com/maps/@41.0456218,-76.0140332,3a,75y,209.76h,94.6t/data=!3m6!1e1!3m4!1sT6fWxgafg_lUZ-4pqTdL9Q!2e0!7i16384!8i8192?hl=en) (20 MPH).
Quote from: Strider on May 03, 2020, 05:01:46 PM
I-495 Capitol Beltway at I-270 spur. I-495 Westbound curves with 50 mph to merge with the southern end of I-270 Spur. Not sure about the northbound I-495 one that is going to the east.
NB 495 does not have a posted speed to head around to the east. But about once a year or so a semi tips over on this curve...it is difficult (even for cars) to stay in your lane at over 55 mph.
I-195 Eastern terminus - to I-495 North - Wareham, MA
Cloverleaf ramp.
The movement to MA-25 East is far more gradual.
Quote from: cpzilliacus on May 04, 2020, 05:47:05 AM
Junction of I-80 and I-81 (https://www.google.com/maps/place/41%C2%B034'27.0%22N+75%C2%B015'21.0%22W/@41.0451907,-76.0206704,15z/data=!4m5!3m4!1s0x0:0x0!8m2!3d41.574167!4d-75.255833?hl=en) near Hazleton, Pennsylvania has an assortment of very sharp ramps. Who in Sam Hill approved this design?
[Speeds are recommended maximum speeds as signed by PennDOT]
I-81 S to I-80 E (https://www.google.com/maps/@41.0456218,-76.0140332,3a,75y,203.28h,92.68t/data=!3m6!1e1!3m4!1sT6fWxgafg_lUZ-4pqTdL9Q!2e0!7i16384!8i8192?hl=en) (20 MPH);
I-80 E to I-81 S (https://www.google.com/maps/@41.0440578,-76.0201554,3a,75y,98.81h,86.31t/data=!3m6!1e1!3m4!1sGKouVvWhJMDhz1QQEUbpDg!2e0!7i13312!8i6656?hl=en) (30 MPH);
I-81 N to I-80 E (https://www.google.com/maps/@41.0436292,-76.0142631,3a,75y,41.32h,91.01t/data=!3m6!1e1!3m4!1sDX4t9ejNnbDPxDNUL5Jrrw!2e0!7i13312!8i6656?hl=en) (30 MPH);
I-80 E to I-81 N (https://www.google.com/maps/@41.0457778,-76.0116643,3a,75y,77.45h,84.36t/data=!3m6!1e1!3m4!1sFxJ10wKCWIF2dhyFyO0c4Q!2e0!7i16384!8i8192?hl=en) (left exit - 40 MPH);
I-80 W to I-81 N (https://www.google.com/maps/@41.0491673,-76.0040405,3a,26.3y,259.41h,92.55t/data=!3m6!1e1!3m4!1sqExntAGw2lPjek5eYAOM8Q!2e0!7i16384!8i8192?hl=en) (merges with ramp above - 20 MPH);
I-80 W to I-81 S (https://www.google.com/maps/@41.0471412,-76.0120924,3a,75y,271.14h,97.09t/data=!3m6!1e1!3m4!1skumk99wTiLGD9dnOfcUDqw!2e0!7i16384!8i8192?hl=en) (15 MPH);
I-81 S to I-80 W (https://www.google.com/maps/@41.0501301,-76.0102657,3a,75y,240.92h,90.67t/data=!3m6!1e1!3m4!1sEzE6mYRUNZlhDkQNc5E4Sw!2e0!7i16384!8i8192?hl=en) (40 MPH); and
I-81 S to I-80 E (https://www.google.com/maps/@41.0456218,-76.0140332,3a,75y,209.76h,94.6t/data=!3m6!1e1!3m4!1sT6fWxgafg_lUZ-4pqTdL9Q!2e0!7i16384!8i8192?hl=en) (20 MPH).
Whoever it was, the DRPA hired them to build their Interstate 76/95 connections, which max out at 25 mph.
I-75 to I-75 at the I-375 interchange in Detroit has a tight right turn ramp sb and a tight flyover ramp nb.
The stack at I-75/I-696 has all ramps yellow-posted at 35 mph - although 45-50 is plenty safe.
Pretty much any interstate that meets the Thruway ticket system will qualify for this thread due to the trumpet ramps. The exception is the I-90 through movements at exit 24 (free-flow except for the toll barrier). The I-87 NB through movement, though not a trumpet, has similar geometry (SB isn't quite as tight). Of course, the Thruway through movements are free-flow.
Speaking of I-87, the SB through movement at nearby exit 1 also has a tight curve. There's a location that looks like it should be an option lane but isn't in order to slow trucks down.
Thedirect connections between I-84 and I-91 (ie the ones that don't use CT 15) all have 30 or 35 MPH advisory limits. The only one that is 35 is the flyover from 84 East to 91 North. The I-684 North to I-84 East ramp in Brewster has a 35 MPH advisory limit, and is one of the most deceptive sharp curves I've ever encountered. It feels like a nice high speed ramp, then it turns almost 90° on the dime just before the merge.
SB I-35 → SB I-35 (https://goo.gl/maps/7qrzNNPWSEEN8Ese6): 30 mph bend
This one actually somehow manages to throw me off every single time. For some reason, I keep thinking it must be possible to drive faster than 30-35 mph around that bend, but nope! Bad idea.
Quote from: vdeane on May 04, 2020, 12:58:37 PM
Pretty much any interstate that meets the Thruway ticket system will qualify for this thread due to the trumpet ramps. The exception is the I-90 through movements at exit 24 (free-flow except for the toll barrier). The I-87 NB through movement, though not a trumpet, has similar geometry (SB isn't quite as tight). Of course, the Thruway through movements are free-flow.
Speaking of I-87, the SB through movement at nearby exit 1 also has a tight curve. There's a location that looks like it should be an option lane but isn't in order to slow trucks down.
Are you talking about the one in Albany, NY? If so, I am still trying to understand why there isn't a direct connection just past the interchange, especially at the stub end at U.S. 20? Could have fixed that mess between I-90/I-87 as I-87 could have easily stay on the same road, as well as I-90 instead of having both Interstates exit themselves. I know there are Thruway system, but I have seen systems interchange built at Thruway.
Yep. As for why, I-87 was planned to follow a road parallel to the Thruway down to exit 23 that never got built (this is also why I-787 ends the way it does). There were plans in the past couple decades to build a pair of E-ZPass-only ramps there, but it never happened for some reason.
Quote from: vdeane on May 04, 2020, 08:17:38 PM
Yep. As for why, I-87 was planned to follow a road parallel to the Thruway down to exit 23 that never got built (this is also why I-787 ends the way it does). There were plans in the past couple decades to build a pair of E-ZPass-only ramps there, but it never happened for some reason.
So, if I-87 runs parallel to the Thruway down to exit 23 and meets I-787 there at the Thruway... would I-87 have joined the Thruway from there?
In downtown STL, the WB 55/64 to NB 44 (former 70) ramp is 20 mph.
Quote from: STLmapboy on May 05, 2020, 11:51:41 AM
In downtown STL, the WB 55/64 to NB 44 (former 70) ramp is 20 mph.
Looking at
GSV (https://goo.gl/maps/GeTjVCKtfbVjeQx49), it appears the WB-to-NB ramp is 30 mph, but the WB-to-SB ramp is 20 mph.
Quote from: Strider on May 04, 2020, 08:47:34 PM
Quote from: vdeane on May 04, 2020, 08:17:38 PM
Yep. As for why, I-87 was planned to follow a road parallel to the Thruway down to exit 23 that never got built (this is also why I-787 ends the way it does). There were plans in the past couple decades to build a pair of E-ZPass-only ramps there, but it never happened for some reason.
So, if I-87 runs parallel to the Thruway down to exit 23 and meets I-787 there at the Thruway... would I-87 have joined the Thruway from there?
Presumably, but from from what I've seen of the originally planned interchange (http://www.capitalhighways.mysite.com/cgi-bin/i/highways/m-ca/map.jpg), I'm not sure how the connection would have been made, unless there were to be flyover ramps further up or something.
Quote from: kphoger on May 05, 2020, 12:36:56 PM
Quote from: STLmapboy on May 05, 2020, 11:51:41 AM
In downtown STL, the WB 55/64 to NB 44 (former 70) ramp is 20 mph.
Looking at GSV (https://goo.gl/maps/GeTjVCKtfbVjeQx49), it appears the WB-to-NB ramp is 30 mph, but the WB-to-SB ramp is 20 mph.
Wow, that bridge seriously needs to be upgraded.
Quote from: bassoon1986 on May 03, 2020, 11:35:18 PM
I-10 EB to I-110 NB in Baton Rouge, LA
I-10 WB through the 110 interchange has a 35 mph truck speed limit and a 35 mph warning speed:
https://www.google.com/maps/@30.4370639,-91.1778417,3a,75y,356.31h,89.48t/data=!3m6!1e1!3m4!1svf4CFfu99rCQtQqDFlzZDA!2e0!7i13312!8i6656
I-290E to I-495N (https://goo.gl/maps/yvajcEzEb1BSoUhYA)
I-695 EB to I-83 SB:
https://www.google.com/maps/@39.4086521,-76.666542,3a,64y,45.68h,87.89t/data=!3m6!1e1!3m4!1sE-uNIOwES-gwW70WDTPEMA!2e0!7i16384!8i8192!5m1!1e1?hl=en
And then, a mile and a half later, I-83 NB exiting I-695 EB to continue north:
https://www.google.com/maps/@39.420748,-76.6459255,3a,37.5y,103.23h,90.86t/data=!3m6!1e1!3m4!1smi7MOExkR1nypWiu3eV4Qg!2e0!7i16384!8i8192!5m1!1e1?hl=en
I-44 EB exit off WB I-244 in west Tulsa has a 20 MPH advisory speed.(https://uploads.tapatalk-cdn.com/20200507/14cdb84fa52255e6ada0e74cfff09edb.jpg)
SM-T580
I-95 south to I-26 east
https://goo.gl/maps/kDWnaNcZNi9TrKzq7
the ramps are in pretty bad shape too
I feel like any NYC roads are low-hanging fruit, but here goes.
* I-678 north coming off the Whitestone to 95/278 has a sharp 20 or 25 mph curve
* 95 and 87, some very sharp, but cool, 20-25 mph curves
* Anything that 278 touches (278 at the Battery Tunnel (I-478), 278 at 495 (30 mph), 278 at 87 (25 mph, the guardrail is painted black and yellow), 278 at 895 (now NY 895) very sharp 20 mph curve to stay on 278
* 684 ramps onto 84 west or east. 684 backs up for miles approaching 84 because the ramps are so tight, plus the two-lane section between 684 and Danbury, CT really needs another lane
* 84/86 interchange at a cloverleaf
There is still a 25mph loop ramp from NB I-215 to WB I-10 at Colton, CA (all the rest were upgraded to flyovers decades ago). All the loops at the I-580/680 interchange in Dublin save SB 680>EB 580 are still posted at 25 mph. Likewise for the terminal ramp from SB I-880 to SB (compass east) I-280 in San Jose. But one of the more egregious instances -- the TOTSO on EB original I-80, a 35mph "hook" ramp within the turbine-style Oak Park (US 50/CA 99) interchange in Sacramento, was obviated when I-80 was rerouted around the city on the old original I-880 in 1982.
But even new interchange modifications have some notable curvature -- particularly NB I-215 in Riverside, where the direct ramp continuing that route takes a sharp turn before merging with traffic from CA 91 -- and drops to a single lane, which exits at the next interchange!
Quote from: fillup420 on May 08, 2020, 02:20:45 PM
I-95 south to I-26 east
https://goo.gl/maps/kDWnaNcZNi9TrKzq7
the ramps are in pretty bad shape too
I feel like a lot of 95 in SC is in bad shape.