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[CYoder]

I wasn't going to post this, but it's in the same vein as many others above me. The 405/518 interchange with the 5 in Tukwila, Washington has a westbound carriageway that goes over the 5, whereas the eastbound carriageway passes beneath the 5. This is simply due to the design of the interchange, with the left-side ramps for various movements, requiring some higher bridges.

I-70 also does this at its interchange with I-77.

[MCRoads]

now that i think about it, I-35/235/40 in OKC does a weird thing like this...

here's the link: https://goo.gl/maps/Ks7R1w3qhpj

[Strider]

The I-80/I-81 Interchange near Hazleton, PA.

https://www.google.com/maps/place/Hazleton,+PA/@41.0452947,-76.0155148,1320m/data=!3m1!1e3!4m5!3m4!1s0x89c5a4132867b6b1:0x442d01bc719543f4!8m2!3d40.9584181!4d-75.9746472

[dvferyance]

The only one I can think of is US 20 somewhere east of Dubuque has an odd interchange on the westbound side while the eastbound side has an at grade intersection.

[ErmineNotyours]

Washington US 195, 15 miles south of Spokane.  https://goo.gl/maps/umbPMQgGXgN2

[plain]

Not sure this counts but in Richmond where I-64, I-95 and I-195 meets (Bryan Park Interchange), there are ramps from I-95 SB to I-195 and from I-195 to I-95 NB. I-64 WB goes over these ramps while I-64 EB goes under them.

I'm thinking I-64's interchange with I-95 (which was built before I-195 existed) was graded the way it was with I-195 in mind, maybe.

https://goo.gl/maps/KSkaiDp1rtj

[thefraze_1020]

Another one in Washington that sort of counts is I-5 in Woodland at the Dike Access Road interchange (exit 22). The original northbound bridge dates to the late 40's or early 50's from an expressway realignment of US 99/ US 830. The southbound bridge is higher and dates to circa 1972 when I-5 was widened out to the 6-lane configuration it is today.

https://www.google.com/maps/@45.930087,-122.7545222,15z?hl=en

[seicer]

I-64/77 and WV 114 in Charleston, WV due to the terrain.

[1]

I-89 and County Rd. in New London, NH, between Exit 11 and Exit 12.

[PurdueBill]

US 30 WB goes over OH 83 as well as Pittsburgh Ave/Lincoln Hwy while US 30 EB goes under both near Wooster, Ohio.  (I hope I didn't miss this one above.)  It was this way even when US 30 exited at the Lincoln Hwy exits and went east on the old road until the expressway between Wooster and OH 57 near Orrville was completed.

[Revive 755]

The only one I can think of is US 20 somewhere east of Dubuque has an odd interchange on the westbound side while the eastbound side has an at grade intersection.

https://goo.gl/maps/YfqfTSLRi6Q2

[rte66man]

The only one I can think of is US 20 somewhere east of Dubuque has an odd interchange on the westbound side while the eastbound side has an at grade intersection.

https://www.google.com/maps/@42.4629034,-90.5152782,1120m/data=!3m1!1e3

[roadman65]

I-80 and I-287 in Parsippany, NJ where NB I-287 crosses under I-80 while its SB counterpart crosses over it.
The Garden State Parkway at NJ 3  in Clifton, NJ where the NB Parkway goes over Route 3 and Allwood Road while SB crosses under the 2 roadways.

US 202 & 206 used to have separate grades at US 22 in Somerville before the Commons Mall was constructed.  The current EB to NB ramp under US 22 was the NB lanes of US 202 & 206.

In San Diego there is part of CA 75 where SB has a flyover a beach park entrance while the NB side has an at grade signalized intersection.

In Fort Myers, FL on US 41 at FL 82 the NB lanes  of 41 flyover the intersection while the SB lanes pass through it at grade.

[DandyDan]

I recall seeing something like that NW of Winona, MN on US 61.

[jay8g]

I-64/77 and WV 114 in Charleston, WV due to the terrain.

That reminds me of this one, down south of Seattle (by Southcenter).

[jakeroot]

I-64/77 and WV 114 in Charleston, WV due to the terrain.

That reminds me of this one, down south of Seattle (by Southcenter).

Funny. Post #23 (made by myself) mentions the 405 over-under split at I-5, but I completely forgot about Klickitat Ave just to the south! There is definitely some funky geography in the area.

[cjk374]

Rosborough Springs Rd. in East Texas. Westbound I-20 goes over it, while eastbound goes under it.

https://www.google.com/maps/@32.4897218,-94.390339,0a,75y,181.7h,91.53t/data=!3m4!1e1!3m2!1speh4w0tmb-SoMQQ09MCw0A!2e0

[Flint1979]

There's a configuration like that west of Chelsea, MI on I-94:  https://www.google.com/maps/@42.2946212,-84.0859395,1295m/data=!3m1!1e3?hl=en

As far as I know, this highway was devised in that manner; both sides were built at the same time.  Old US-12, that the freeway replaced, is about 1/2 mile east of the railroad.

There’s another one on I-94 (and 90/39) southeast of Portage, WI. I’m not sure what road is being ” undoverpassed there.

Smokey Hollow Road I believe.
https://www.google.com/maps/@43.3774501,-89.4623347,747m/data=!3m1!1e3?hl=en

[1]

How could I forget MA 24 at I-495?

[jakeroot]

How could I forget MA 24 at I-495?

Yeah man, what the F?!? I mean, even I knew about that one. I just didn't post it here. Was waiting on you to...

[WR of USA]

In downtown Hartford CT, I-84 does this twice. WB 84 goes beneath Asylum Avenue and Broad Street while EB 84 goes above Asylum Avenue and Broad Street.

[webny99]

How could I forget MA 24 at I-495?

Yeah man, what the F?!? I mean, even I knew about that one. I just didn't post it here. Was waiting on you to...

This is a classic example of sarcasm being hard to read over the internet.
I can't decipher whether you really knew about it or not. I sure as heck didn't, before this thread.

[jakeroot]

How could I forget MA 24 at I-495?

Yeah man, what the F?!? I mean, even I knew about that one. I just didn't post it here. Was waiting on you to...

This is a classic example of sarcasm being hard to read over the internet.
I can't decipher whether you really knew about it or not. I sure as heck didn't, before this thread.

I was playing into 1's slightly odd rhetorical question. Obviously I don't know how he forgot, but it's not like it was a glaring omission from this thread.

[webny99]

How could I forget MA 24 at I-495?

Yeah man, what the F?!? I mean, even I knew about that one. I just didn't post it here. Was waiting on you to...

This is a classic example of sarcasm being hard to read over the internet.
I can't decipher whether you really knew about it or not. I sure as heck didn't, before this thread.

I was playing into 1's slightly odd rhetorical question. Obviously I don't know how he forgot, but it's not like it was a glaring omission from this thread.

I kind of figured that - I don't know of any of these in my own area, and I haven't googled the above example, so I have no basis to say whether or not I'd expect him to remember it. 

[ipeters61]

I simply find the Kirkwood Highway (DE-2) in the Wilmington area to be the strangest and most annoying road in the entire state: https://goo.gl/maps/MZqXpzq32xC2