Interstate to Interstate junctions that contains sharp curves

[Strider]

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?

[ilpt4u]

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

[hotdogPi]

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.

[ilpt4u]

This thread is about 90° curves, not 270° curves.

The OP referenced Thru I-73 North utilizing a Cloverleaf Loop Ramp in Greensboro

[jeffandnicole]

If I were to do a small wager, more I-I ramps are 50 mph or less, than are 55 mph or greater.

[Strider]

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.

[ilpt4u]

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?

[Strider]

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

[ozarkman417]

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.

[ilpt4u]

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

[dlsterner]

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)

[Roadgeekteen]

I-95/I-93 southern end

[csw]

I-65/I-70 north split in Indianapolis has 40mph advisory speeds in all directions

[webny99]

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.

[webny99]

I-90 in Cleveland does a 90 (fitting!) degree turn at both ends of it's multiplex with OH 2.
The eastern end and the famous western end, known as Dead Man's Curve.

[Strider]

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.

[TheHighwayMan3561]

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.

[ilpt4u]

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

[kphoger]

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.

[kphoger]

WB I-70 → WB I-70 ... 35mph direct ramp

WB I-70 → SB I-35 ... 35mph indirect ramp

[bassoon1986]

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

[ozarkman417]

WB I-70 → WB I-70 ... 35mph direct ramp

Another one on the Kansas side

[cpzilliacus]

Junction of I-80 and I-81 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 (20 MPH);

I-80 E to I-81 S (30 MPH);

I-81 N to I-80 E (30 MPH);

I-80 E to I-81 N (left exit - 40 MPH);

I-80 W to I-81 N (merges with ramp above - 20 MPH);

I-80 W to I-81 S (15 MPH);

I-81 S to I-80 W (40 MPH); and

I-81 S to I-80 E (20 MPH).

[Mapmikey]

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.

[DJ Particle]

I-195 Eastern terminus - to I-495 North - Wareham, MA
Cloverleaf ramp.
The movement to MA-25 East is far more gradual.