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[jakeroot]

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

There is some interesting geography here (obviously a hilly area), but I think the point of the thread was to point out roads where one direction was above or below the other direction.

[jeffandnicole]

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

There is some interesting geography here (obviously a hilly area), but I think the point of the thread was to point out roads where one direction was above or below the other direction.

Right here isn't too hilly. It's just a very busy area with a lot of roads, homes and businesses with a lot of nearby traffic lights. If you back far away on GSV you can see that they depressed this area to have Centerville Rd go under Kirkwood highway. You can access this area fully about 1/4 mile away on regular roads, or go thru a shopping center (Prices Corner) that gives access to both roads.

[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

There is some interesting geography here (obviously a hilly area), but I think the point of the thread was to point out roads where one direction was above or below the other direction.

Right here isn't too hilly. It's just a very busy area with a lot of roads, homes and businesses with a lot of nearby traffic lights. If you back far away on GSV you can see that they depressed this area to have Centerville Rd go under Kirkwood highway. You can access this area fully about 1/4 mile away on regular roads, or go thru a shopping center (Prices Corner) that gives access to both roads.

That makes sense, it seemed like it had to be some forced geographic situation.  As far as I know, it's the only section of Kirkwood with an overpass.

I guess if we're on that subject, here's DE-896/US-301/DE-71 just before the Summit Bridge, or as I call it, the little expressway that couldn't: https://goo.gl/maps/iUoMr7r8BXx

Again, it's the only off-grade intersection that I know of on that road and when I was commuting from Newark to Dover, I went through it every day.

[epzik8]

I'd say MD-24/MD-924/Tollgate Road in Abingdon, Maryland. People coming from I-95 north have to go through a traffic light at the end of MD-924 before proceeding onto MD-24 north.

[ErmineNotyours]

The Los Angeles 110 Arroyo Seco Freeway was built using existing tunnels going east, and new bridges going west.  This allowed for weird left entrances like this until they were closed off.  I had seen this arrangement on a map, and could not picture what it really looked like or why until the internet came along.  Later it became cheaper to build bridges instead of tunnels, I guess.

[Flint1979]

I don't know why I haven't really noticed this before but tonight I noticed that at exit 93 on I-75 which is where US-24 ends the northbound side has an overpass over Dixie Highway and the southbound side has an underpass under Dixie Highway. This interchange has ramps in the median with northbound Dixie to northbound I-75 the traffic merges onto I-75 in the left lane, same for southbound Dixie to southbound I-75.

[sparker]

One more oddity on CA 99:  the Buhach Road interchange near Atwater has a NB flyover and LH exit/entrances SB in 99's median.  This was the main access to the old Castle AFB, now a local airport and industrial park; the configuration was intended to expedite military convoy movement to and from the base, which was one of the principal B-52 bases for Vietnam-era bombing missions.  This fact being well-known at that time, during 1967-71 there were invariably protestors lining the east side of CA 99, mostly on the frontage road.  They'd occasionally venture under the NB flyover onto the median, where they would be quickly escorted back by either CHP or Merced County sheriff's deputies (I personally witnessed -- and occasionally photographed -- these interactions during that time as a field reporter for the UC Riverside school newspaper).  The Caltrans long-range "master plan" for CA 99 will reconfigure this interchange as a conventional diamond with the through lanes on a berm (the proximity to the UP main line directly adjacent to the freeway dictates a "tight" ramp arrangement).

[jp the roadgeek]

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.

And you also have the I-84/I-91 junction. The northbound lanes of I-91 pass under I-84, while the southbound lanes pass over. 

[ErmineNotyours]

The Caltrans long-range "master plan" for CA 99 will reconfigure this interchange as a conventional diamond with the through lanes on a berm (the proximity to the UP main line directly adjacent to the freeway dictates a "tight" ramp arrangement).

Looks like it's already happened.

[ChezeHed81]

The first one I could think of not previously mentioned is where the NJ Turnpike crosses Rt. 9 north of Exit 11 for the Garden State Parkway. There, three of the four Turnpike carriageways pass under Rt. 9 while only the SB truck lanes cross over Rt. 9.

[cl94]

The Caltrans long-range "master plan" for CA 99 will reconfigure this interchange as a conventional diamond with the through lanes on a berm (the proximity to the UP main line directly adjacent to the freeway dictates a "tight" ramp arrangement).

Looks like it's already happened.

Correct. I drove through there in August and that area was Interstate grade.

[US 89]

Here's something that I think qualifies north of Ogden, Utah. It's certainly weird, and I don't think I've ever seen anything else like it.

US 89 and UT 126, Hot Springs Junction

Southbound US 89 follows its own one-way carriageway through this intersection and is grade separated from 126, but all access between 126 and 89 is handled through a two-way carriageway which carries mainline northbound 89. That meets 126 at grade, with several weird left-turn ramps and merges.

[thefraze_1020]

There is a similar setup in Chehalis, WA:

https://www.google.com/maps/@46.6732801,-122.9712597,256m/data=!3m1!1e3?hl=en&authuser=0

[cl94]

We somehow haven't had the northern I-93/US 1 junction in Boston yet. The Storrow ramps and double-deck section to the north add to the confusion.

[jakeroot]

There is a similar setup in Chehalis, WA:

https://www.google.com/maps/@46.6732801,-122.9712597,256m/data=!3m1!1e3?hl=en&authuser=0

Another similar-ish one...BC Hwy 1 @ Lougheed Highway, just northwest of Hope: https://goo.gl/CjX9nJ

Problem with these (and US 89's US 89 example), is that they technically don't involve divided highways (though both are certainly high-speed arterials).

[roadman65]

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.

That is to allow the left exit ramp grade to be not so steep.

In New Jersey I-287 does it at I-80. NB Lanes go under I-80 while the SB Lanes go over I-80.  That is for the left side merges from I-80. Funny thing is though that I-80 was built after I-287 there. https://goo.gl/maps/4gi3ez6RpPJ2

Garden State Parkway does it in Clifton at NJ 3.  The NB Parkway goes over NJ 3 ( and Allwood Road) and the SB Parkway goes under NJ 3 (and Allwood Road).  That also is for left exits on the Parkway. https://goo.gl/maps/TA5CwuUTY8N2

Then in Woodbridge the NJ Turnpike does it at US 9.  The NB lanes go under it, but the SB inner roadway also goes under it.  The SB outer roadway goes over US 9.  The southbound outer (truck) lanes use the original 1957 overpass over US 9 also and before the widening in 1972 the SB mainline went over US 9 while the NB mainline went under it.  Why as there were no left exits there, so its a mystery to why the NJTA did that seven decades ago. https://goo.gl/maps/mg2y3SX7p9s

[WNYroadgeek]

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

[thspfc]

I-39/90/94 goes under and over Smokey Hollow Rd in Poynette. Probably due to the hilly topography. https://www.google.com/maps/@43.3784365,-89.4619786,967m/data=!3m1!1e3

[ipeters61]

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.

And you also have the I-84/I-91 junction. The northbound lanes of I-91 pass under I-84, while the southbound lanes pass over.

As it turns out, I actually have a nice photo of this, taken from the Founders Bridge, when I went to CT at the beginning of this month (I-91 is the foreground, I'm facing northbound; I-84 is where the FedEx truck is, I believe):

[KEVIN_224]

Yes with the Fed-Ex truck for I-84/US Route 6. The bluish bridge along the top is the flyover ramp from I-84/US 6 East to I-91 North. It opened in the fall of 1990.

[JKRhodes]

The Los Angeles 110 Arroyo Seco Freeway was built using existing tunnels going east, and new bridges going west.  This allowed for weird left entrances like this until they were closed off.  I had seen this arrangement on a map, and could not picture what it really looked like or why until the internet came along.  Later it became cheaper to build bridges instead of tunnels, I guess.

A similar setup was proposed in the late 90's at US 60 and AZ 79 in Arizona to reduce accidents; elevate the eastbound lanes of US 60 over 79, then let 79 terminate at grade at Westbound US 60. Ultimately ADOT went with a reroute and a full diamond interchange, then slimmed down the old US 60 alignment and turned it into a local street.

https://goo.gl/maps/3oxRTGDJBJeKsNCx8

[JKRhodes]

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.

And you also have the I-84/I-91 junction. The northbound lanes of I-91 pass under I-84, while the southbound lanes pass over.

As it turns out, I actually have a nice photo of this, taken from the Founders Bridge, when I went to CT at the beginning of this month (I-91 is the foreground, I'm facing northbound; I-84 is where the FedEx truck is, I believe):

Interesting, looks like it was done this way due to design/space considerations. In Arizona, Bumble Bee Road crosses over Southbound I-17 and then under Northbound I-17 in some pretty rugged terrain:

https://goo.gl/maps/Rqxbwzo5p1CaqiaG8

Further south, in Phoenix, ADOT provided a direct connection between I-10 and SR 51 by squeezing both directions of carpool lanes next to the Westbound 10 - Northbound 51 ramp, then running those carpool lanes parallel to Westbound I-10 for about a half mile before braiding over the westbound lanes back into the median. Considering the pre-existing construction, there really was no other feasible alternative:

https://goo.gl/maps/99Tp8rc7PkzJRiyp8

[CtrlAltDel]

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.

And you also have the I-84/I-91 junction. The northbound lanes of I-91 pass under I-84, while the southbound lanes pass over.

As it turns out, I actually have a nice photo of this, taken from the Founders Bridge, when I went to CT at the beginning of this month (I-91 is the foreground, I'm facing northbound; I-84 is where the FedEx truck is, I believe):

Another place where (the other) I-84 has something like this is exit 224, near the top of Cabbage Hill in Oregon.

[Richard3]

On I-89, from north to south,...

1) At I-189 (exit 13), in South Burlington, VT. https://goo.gl/maps/ALzsvhufwtrf8Mrr8

2) At Crossover Rd., in Brookfield, VT. https://goo.gl/maps/nqCcdz5gFtmY83ZT7

3) At County Rd., in New London, NH. https://goo.gl/maps/kMp1EvYXmS92ofqE8

[wxfree]

I-35 at Cesar Chavez St in Austin Tx:
https://www.google.com/maps/@30.2616588,-97.7363717,3a,75y,173.73h,81.95t/data=!3m7!1e1!3m5!1sy6PJ-E0XPuDDwboB8TftoQ!2e0!6s%2F%2Fgeo3.ggpht.com%2Fcbk%3Fpanoid%3Dy6PJ-E0XPuDDwboB8TftoQ%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D15.871571%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656?hl=en-US

I came here to cite this one. The architecture looks (to my amateur eyes) to date from the 1950's and the original construction of I-35. Were the southbound lanes the original path of US 81 and/or East Ave, does anyone know?

This question is old, but I find it intriguing.  It seems familiar; I think I've looked at it before, but I don't remember drawing a conclusion.  I'm pretty sure I can say that the previous path of US 81 was along the southbound lanes.  Click the link below and go to page 4.  It shows the survey, dated 1958 (note that these dates are not always accurate, but this document does give the date on the last page).  It doesn't show the new or proposed right-of-way, but it does show existing East Ave. and the centerline for the proposed construction.  On the right edge of the page it shows where Brushy St. intersects 1st.  Based on the lot lengths given I estimate it's approximately 230 feet from the edge of Brushy to the centerline.  Google Earth tells me that's just about in the middle of where the freeway is now.  East Ave. is clearly shown just west of that centerline.

https://maps.dot.state.tx.us/ROW_PDF/AUS001513AR.pdf

The Real Property Asset Map answers a lot of questions about old alignments.

https://www.txdot.gov/inside-txdot/division/right-of-way/delineation-system.html