Freeway Intersection Where Road Goes Over One Carrageway & Under The Other

[ethanhopkin14]

Since I was a kid I was fascinated with this road that crosses I-20:

https://goo.gl/maps/6qL7L1AzUgk3KgUw5

I know a lot of times a cross street might go over one carriageway and under the other because of discrepancies in terrain of the carriageways, but this particular situation seems like it was deliberately done that way.  The land is very flat and the road goes abnormally up to cross the eastbound I-20 lanes then drops down to go under the westbound lanes.  I-20 in this area usurped US-80, but the alignment is several miles north of I-20 so there wasn't any direct upgrade.  I-20 ran on a brand new alignment so not really sure why they chose to do this. 

Anyway, back to the topic, I want to see any other examples of this.  It can be because of logistic reasons (not because it was on purpose).

[hotdogPi]

I-495 and MA 24 (both freeways)

[silverback1065]

Morris st and prospect street and i-65 in downtown indy

Pixel 5

[kphoger]

Man, I know we've had a conversation about this topic, but I can't find the thread at the moment.

[TheHighwayMan3561]

I-39/90/94 and Smokey Hollow Road near Poynette, WI.

https://goo.gl/maps/iAXJhgoJkvz52cvn6

[mgk920]

I-39/90/94 and Smokey Hollow Road near Poynette, WI.

https://goo.gl/maps/iAXJhgoJkvz52cvn6

It's tough to see from the highway, but Funnel Rd goes over the eastbound side and under the westbound side of I-90/94 just west of Camp Douglas, WI, too.

Mike

[webny99]

Man, I know we've had a conversation about this topic, but I can't find the thread at the moment.

I'm sure we have too. I'm equally sure that I'm going to suddenly remember the examples that I can't think of right now.

[mgk920]

Man, I know we've had a conversation about this topic, but I can't find the thread at the moment.

I'm sure we have too. I'm equally sure that I'm going to suddenly remember the examples that I can't think of right now.

I think that it was about 'over/under' crossings.

Mike

[wanderer2575]

US-24 at M-10 in Southfield, MI.
https://goo.gl/maps/Ffo8yiQ23zAD3M2o9

M-10 at M-8 in Detroit, MI.
https://goo.gl/maps/AwukTepxW9mYicUi6

Northern terminus of US-24 at I-75 in Clarkston, MI.
https://goo.gl/maps/BZUb3qGED8M75V5W8

Of course, I-196 at US-131 in downtown Grand Rapids, MI.
https://goo.gl/maps/B8DX6kkLun3qZaGR8

I-94 at the railroad crossing east of Kalmbach Road in Chelsea, MI.  What is now the westbound I-94 carriageway used to be part of the US-12 bypass.  I'm guessing that when the eastbound carriageway was constructed later, it was easier to bridge over the railroad than to reroute the track and bridge over the freeway.
https://goo.gl/maps/dbqx9sLCiAuQ2FWdA

[kphoger]

Man, I know we've had a conversation about this topic, but I can't find the thread at the moment.

I'm sure we have too. I'm equally sure that I'm going to suddenly remember the examples that I can't think of right now.

I think that it was about 'over/under' crossings.

Found it!  Divided highways with weird off grade intersections.

The one I thought of is in that thread:  I-35 @ Cesar Chavez St (Austin, TX)

[SkyPesos]

I-64 and Grand Blvd

This one has no exit ramps, but worth mentioning: Ohio Turnpike and I-271

[ran4sh]

The old configuration of SR 400 at I-285. I-285 went over 400 NB but under 400 SB. The roads are still in this configuration for now, although I don't know when that will change.

After the current construction project is complete, SR 400 will be over I-285, each direction.

[ethanhopkin14]

Man, I know we've had a conversation about this topic, but I can't find the thread at the moment.

I'm sure we have too. I'm equally sure that I'm going to suddenly remember the examples that I can't think of right now.

I think that it was about 'over/under' crossings.

Found it!  Divided highways with weird off grade intersections.

The one I thought of is in that thread:  I-35 @ Cesar Chavez St (Austin, TX)

Yeah, that one was a case of the old East Ave. going solely under 1st Street.  Then when they widened I-35, they decided not to widen the 1st Street overpass, and elected to elevate the northbound lanes, so now they cross over.   

[1995hoo]

I-395 at the Capital Beltway (I-495, at the relevant location) in Virginia: The Beltway's Outer Loop passes over I-395, while the Inner Loop passes under. I-95 passes through that interchange but doesn't qualify because it's on two flyovers that pass over everything. https://www.google.com/maps/@38.7915237,-77.1761742,17.5z

Just south of there, Secondary Route 644 (Old Keene Mill/Franconia Roads) passes over southbound I-95 and the HO/T lanes and passes under northbound I-95 and I-395.* https://www.google.com/maps/@38.7789859,-77.1806564,17.5z

*Before any hypertechnical types jump on me, I'm not 100% certain where exactly I-395 "technically" begins, but the roads are quite reasonably signed to imply I-395 begins just south of Route 644 because northbound I-95 splits off to the left at that point onto what becomes the flyover carrying I-95 onto the Beltway.

[AlexandriaVA]

With respect to your asterisk (off-topic, I know).

I think you'd agree that I-95 continues with the left two lanes in Springfield (https://www.google.com/maps/@38.7742768,-77.181287,3a,37.5y,21.07h,87.8t/data=!3m6!1e1!3m4!1sOGgXPlDCXrItz-vk40vlbA!2e0!7i13312!8i6656). So I-395 *could* start there, at the earliest.

I wouldn't say it starts any sooner south of there, unless it's an unsigned multiplex.

I personally like the idea of it starting there at the split.

I'm guessing VDOT's general public answer is that it it starts "north" of the interchange without getting into hyper-precise location details.

[bit0mike]

I-65 exit 104 in TN.

[Hot Rod Hootenanny]

I guess I-71 & I-670 in Columbus.
https://www.google.com/maps/@39.9766778,-82.9832714,2116m/data=!3m1!1e3?hl=en

[TheGrassGuy]

I-287 and I-80 in Parsippany, New Jersey
I-91 and I-84 Hartford, Connecticut

[Revive 755]

* I-40 at Airport Road near Rockwood, TN
* Used to be one on I-40 at East 5th Avenue as part of the interchange with TN 158 in Knoxville
* I-64/I-77 at Sandbranch Road
* US 40 at Grand in St. Louis
* I-44 at Gravois Avenue in St. Louis
* I-55 at Missouri Avenue and St. Clair Avenue in East St. Louis.

[CtrlAltDel]

Not the most impressive example, but here's exit 224 on I-84 in Oregon, at the top of Cabbage Hill:

[webny99]

Found it!  Divided highways with weird off grade intersections.

Thanks for the find! I figured it must not have used the words "over/under" or I would have found it... and sure enough.

I actually stated in that thread that I didn't know of any examples in my area, only to encounter the below post several replies later:

The I-390/I-490/NY 390 interchange in Rochester (390 north crosses over 490, 390 south crosses under it): https://www.google.com/maps/@43.1573532,-77.6800112,709m/data=!3m1!1e3

My goodness, what a glaring one to forget about, both then and now. I literally looked right at that interchange on Google Maps today while thinking about this thread and got so caught up in the forest (the left hand ramps, none of which cross both carriageways) that I completely missed the trees.

A few years from now, this will be a former example, as 390 southbound is being reconstructed and the new route will take it over I-490 next to its northbound counterpart (the current southbound road that goes under I-490 will essentially serve as a glorified service road). Here is the project thread, and here is the full plan for the interchange.

[roadman65]

NJ Turnpike at US 9.  When US 9 was the route for Exit 11 it's SB crossed over US 9 while NB under it.  Now the SB. Truck lanes only go over US 9 while NB goes under with the SB car lanes. 

[froggie]

Surprised this one didn't get mentioned in the old thread, but here in Vermont we have I-91 Exit 22 on the north side of St. Johnsbury.  It's built into the side of a hill, with NB 91 passing under and SB 91 passing over the side road locally known as Hospital Dr, but officially known as the unnumbered "St. Johnsbury State Highway", a VTrans-maintained connector between I-91 and US 5.

[webny99]

If we're counting non-road crossings, I stumbled across this this railroad crossing north of Amarillo in which northbound US 87 goes under the tracks while southbound US 87 goes over them.

[ethanhopkin14]

If we're counting non-road crossings, I stumbled across this this railroad crossing north of Amarillo in which northbound US 87 goes under the tracks while southbound US 87 goes over them.

I drove this part of US-87 in December for the first time.  I think there was construction there to make the northbound lanes cross over the railroad with the southbound lanes.  I could be wrong, as I might be getting it confused with loads of other construction I encountered on the trip!