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

[jmacswimmer]

-I-95 & MD 32 (plus Guilford Road immediately northeast of the interchange) in Jessup MD
-I-290 & Reservoir St to the east of Worcester MA.
-I-84 & US 20 in Sturbridge MA - this one is interesting because both directions of I-84 cross over US 20 EB, but then I-84 EB descends to cross under US 20 WB while I-84 WB ascends over US 20 WB.

[1995hoo]

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.

I don't want to go too far off-topic, so I'll simply note that the segment between Route 644 and the Beltway still has at least one I-95 milepost and has "Exit 170" tabs on the BGSs, including for the straight-thru movement where the highway crosses the Beltway. If it were I-395, I'd expect to see an "Exit 1" tab for the ramp towards Tysons and no "exit" designation for the straight-thru movement. Whether that whole segment there is to be deemed an "exit" that then splits to I-395 and the Inner Loop is for a different discussion.

[ErmineNotyours]

Another railroad example:

US 195

[Tom958]

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.

Originally, 400 was to pass over 285, with the original bridge for 285 over northbound 400 retained to serve the eastbound to northbound and northbound to westbound ramps. The design was changed, though: Now 400 will pass under 285.

I feel like there's an on-topic example that I know of, but I can't place it. 

[Big John]

^^ there is a creek in that area, so they scrapped that proposal..

[Steve.S]

I-75 at E Galbraith Rd in Cincinnati: 

https://goo.gl/maps/sUGzrKtdR4oyKj9n9

[CtrlAltDel]

I-75 at E Galbraith Rd in Cincinnati: 

https://goo.gl/maps/sUGzrKtdR4oyKj9n9

It also holds for the railroad.

[ethanhopkin14]

I-75 at E Galbraith Rd in Cincinnati: 

https://goo.gl/maps/sUGzrKtdR4oyKj9n9

It also holds for the railroad.

I never knew about this situation!!  There is an entire neighborhood in the median of I-75!

[roadman65]

I-77 and I-70 near Cambridge, OH.

[ethanhopkin14]

Capital of Texas Highway (Loop 360) at Mopac (Loop 1)  https://goo.gl/maps/8giGg56C3YqbyJ1EA

[MCRoads]

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.

That was why I authored the original topic on this, I think it was mentioned earlier. I thought it was pretty beet.

[Steve.S]

I never knew about this situation!!  There is an entire neighborhood in the median of I-75!

Indeed!  The southbound carriageway is the route of the original Millcreek Expressway, which in turn was built largely in the ditch of the old Miami and Erie Canal.  The Village of Lockland (so named because of the numerous locks on the canal in that town) is partially located within the "median" of I-75.  The village of Arlington Heights is entirely within it, and back when it had its own police department, that fact was shown on their shoulder patches.

[Bruce]

I-5 and Klickitat Drive in Tukwila, WA

[kphoger]

I-5 and Klickitat Drive in Tukwila, WA

Get back, Ramona!

[SkyPesos]

I never knew about this situation!!  There is an entire neighborhood in the median of I-75!

Indeed!  The southbound carriageway is the route of the original Millcreek Expressway, which in turn was built largely in the ditch of the old Miami and Erie Canal.  The Village of Lockland (so named because of the numerous locks on the canal in that town) is partially located within the "median" of I-75.  The village of Arlington Heights is entirely within it, and back when it had its own police department, that fact was shown on their shoulder patches.

This area is home to my least favorite interchange in the Cincy area; the exit 12 ramps on SB I-75. Sometimes, I wonder if it was grandfathered into the system, because it looks way below interstate standards.
Also, I think there used to be some state named button copy I-75 shields in this area. They were probably removed within the past few years when ODOT did a lot of button copy sign replacements.

[mgk920]

In the Wooster, OH area, an instance where westbound US 30 goes over a couple of crossroads at interchanges while eastbound goes under:

https://goo.gl/maps/PFdFbRAa5VpyXiGu9

Mike

[webny99]

I can't believe we made it this far without anyone mentioning I-271 at I-80 south of Cleveland. Bonus: there's no interchange at this crossing.

[SkyPesos]

I can't believe we made it this far without anyone mentioning I-271 at I-80 south of Cleveland. Bonus: there's no interchange at this crossing.

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

[webny99]

I can't believe we made it this far without anyone mentioning I-271 at I-80 south of Cleveland. Bonus: there's no interchange at this crossing.

Ohio Turnpike and I-271

Darn, I made sure to scroll back through the entire thread... but I didn't look closely enough, apparently! 

[ethanhopkin14]

I can't believe we made it this far without anyone mentioning I-271 at I-80 south of Cleveland. Bonus: there's no interchange at this crossing.

Ohio Turnpike and I-271

Darn, I made sure to scroll back through the entire thread... but I didn't look closely enough, apparently! 

Why is there no interchange here?

[hotdogPi]

I can't believe we made it this far without anyone mentioning I-271 at I-80 south of Cleveland. Bonus: there's no interchange at this crossing.

Ohio Turnpike and I-271

Darn, I made sure to scroll back through the entire thread... but I didn't look closely enough, apparently! 

Why is there no interchange here?

Ticket-style toll roads like to limit interchanges, and I-77 and OH 8, both freeways, already have them.

Alternatively: because SkyPesos' link leads to the wrong city.

[webny99]

Ohio Turnpike and I-271

Darn, I made sure to scroll back through the entire thread... but I didn't look closely enough, apparently! 

Why is there no interchange here?

Yes, to add to what was just said: The Turnpike has interchanges two miles west at I-77 and five miles east at OH 8, so another interchange isn't really needed. I-271 traffic can use either of those to access the Turnpike depending on which direction they're heading. In fact, I-271 only has one exit between it's own junctions with I-77 and OH 8, so basically all of the traffic on that section of I-271 has just passed an easy opportunity to access the Turnpike.

Also, it goes right through Cuyahoga National Park, so I wouldn't be surprised if that has something to do with the lack of exits.

[SkyPesos]

Alternatively: because SkyPesos' link leads to the wrong city.

The link in my original post works. The one in the quote got messed up because I forgot to remove the first link when modifying the quote. It should work now.