Interstate to Interstate Slow-speed Exits

[Bitmapped]

While not nearly as problematic as its infamous counterpart, I-70 EB at New Stanton is kind of slow.  It's a double trumpet, with a kind of tight loop ramp leading onto the PA Turnpike itself.  How feasible would a direct EB connector ramp be?  It would have to incline and curve upward over a railroad and the Sewickley Creek.  The WB route isn't as bad, as it's pretty much just one elongated loop -- plus the recently-completed improvements at the New Stanton exit off I-70 might help get traffic get up to speed quicker.

Stuff like this will be a lot more feasible once the Pennsylvania Turnpike transitions to all-electronic tolling.

[Takumi]

I-95 NB to I-85. Very tight ramp.

[tckma]

But who takes that ramp anyway?  It's effectively a U-Turn.  Whoops, I've decided I don't like Virginia... I'm fixin' ta head back to No'th Ca'lina now.

I'd imagine it almost makes more sense to exit onto Petersburg's surface streets and get onto 85 at Squirrel Level Road or something.

(Wrote this post from memory without consulting Google Maps.)

I-95 NB to I-85. Very tight ramp.

[Takumi]

But who takes that ramp anyway?  It's effectively a U-Turn.  Whoops, I've decided I don't like Virginia... I'm fixin' ta head back to No'th Ca'lina now.

I'd imagine it almost makes more sense to exit onto Petersburg's surface streets and get onto 85 at Squirrel Level Road or something.

(Wrote this post from memory without consulting Google Maps.)

I-95 NB to I-85. Very tight ramp.

It's the movement for US 460 westbound, for one thing. So US 460 traffic. Also, having formerly worked in Petersburg and being familiar with its streets, driving through town and cutting over to Squirrel Level is slooooooow.

[Beltway]

I-95 NB to I-85. Very tight ramp.

It's the movement for US 460 westbound, for one thing. So US 460 traffic. Also, having formerly worked in Petersburg and being familiar with its streets, driving through town and cutting over to Squirrel Level is slooooooow.

The loop ramp is negotiable at 35 mph, which is probably adequate.  Nevertheless a recent VDOT study considers the building of a semi-directional ramp to replace that loop, probably with a 50 mph or higher design speed.

[Takumi]

No doubt. It's large trucks that have issues there. Seen a few tip-overs in my time driving past the ramp going home from work. I'm sure it's continued since I no longer work in Petersburg.

[ftballfan]

I-75 NB to I-69 WB in Flint

[sparker]

Prior to December 1982, the Oak Park interchange in SE Sacramento (now US 50/CA 99/unsigned CA 51/Biz 80), one of the few "turbine" interchanges in the state, featured a EB I-80 continuation ramp signed at 35mph (compass EB>NB).  The rerouting of I-80 on the former I-880 around the north side of the city eliminated that slow-speed transition (although technically it's still on the route of an Interstate -- the on-paper-only I-305!).   

[Jordanes]

I-64 WB to I-95 SB is basically a left turn from a one way street to a ramp...

https://goo.gl/maps/Po1x7vvwDLU2

I forgot about this one. This is the type I meant with the original post -- not necessarily a cloverleaf, and with some other weird exit crammed in there, as well.

[Jordanes]

Here's a weird one:
71/80/42; back in the day the crossover bridge from the two trumpets was the actual part of the interchange! Before they built 71.
They got rid of the third trumpet and made it a Park and Ride, which is not as awesome as having a true triple trumpet in CLE. The one in Wilkes-Barre is weird and cool though.

What in Wilkes-Barre are you referencing? I am a native, and am currently home for Christmas. I could check it out while here.

Oh, are you talking about the end of the turnpike where it connects to 81 in Clarks Summit? That's not Wilkes-Barre. 

[ftballfan]

The I-196/US-131 (unsigned I-296 north of this interchange) interchange is very slow. I think all of the ramps have advisory speeds of 30mph or below and have extremely tight turns. I took WB 196 to NB 131/296 (I was stuck in the left lane where 96 and 196 split) on Friday and I had to slow way down on that ramp (considering that 196 is 65 and 131 is 70 through there). Compare to several other ramps in the Grand Rapids area that can be taken at or near highway speeds (EB 96 to SB 131, NB 131 to WB 96, most if not all ramps at either end of M-6)

[Jardine]

North of Council Bluffs, IA, I-29 full clover leaf with I-680 to Mormon Bridge and Omaha.  Also has an at grade RR crossing just east of the cloverleaf, although those tracks are rarely used.

Sadly obsolete interchange . . . .

[Beltway]

I-64 WB to I-95 SB is basically a left turn from a one way street to a ramp...
https://goo.gl/maps/Po1x7vvwDLU2

I forgot about this one. This is the type I meant with the original post -- not necessarily a cloverleaf, and with some other weird exit crammed in there, as well.

That is what it was when the Richmond-Petersburg Turnpike (RPT) was originally built, a left turn from 5th Street, and the ramp had a toll plaza. 

I-64 had not had a final location determined when the RPT was built, and the I-64 interchange was opened 10 years later, and the WB local exit from I-64 took over 5th Street and that ramp is exclusively from I-64 until that SB ramp branches off, also 5th Street was severed into 2 sections (seen on the link that was posted above).  The RPT became fully toll-free in 1992.

There are studies underway to improve I-64/I-95 and one of the proposals is to build a semi-directional flyover ramp to replace the movement for WB I-64 to SB I-95.

[Hurricane Rex]

I'm surprised I-80/I-84 Utah interchange hasn't been mentioned. I don't remember the facts on it 100% but I thought I saw it being 25 mph.

In my state Oregon:
One of the only good things we do traffic wise except with one exception:
I-5/I-105 is a full cloverfleef variant.

[US 89]

I'm surprised I-80/I-84 Utah interchange hasn't been mentioned. I don't remember the facts on it 100% but I thought I saw it being 25 mph.

The 80 east to 84 west ramp is indeed signed with an advisory 25 mph. Also, the 84 to 80 west ramp is 35, and 84 to 80 east is 45.

[robbones]

I 540 NB to I 40 WB in Van Buren, AR has a 25 MPH advisory speed.

LGL64VL