Highways crossing over themselves

[CNGL-Leudimin]

It occurs to me that an honorable mention might go to the Lotus Bridge connecting China and Macau. Mainland China drives on the right while Macau drives on the left. The bridge is designed to shift traffic to the proper side of the road by having the carriageways crossing each other in a looping configuration on the Chinese side. I'm not sure it's fair to call this a "highway" in the sense the original post uses it, however, which is why I suggested an "honorable mention":

https://www.google.com/maps/@22.1392267,113.5483006,994m/data=!3m1!1e3

Also in China, you have G5 expressway crossing over itself twice in central Sichuan. G30 also does this in Northwestern Xinjiang.

About carriageway crossovers, I can think of a section Spanish A-23 currently U/C which will do so when completed on February 30th.

[ibagli]

In Italy, the A6/E717 does it several times west of Savona. The eastbound carriageway also goes under itself in a tunnel.

[roadman65]

What about PA 3 in Philadelphia, PA?  Though not a freeway, but EB PA 3 crosses over WB PA 3 at grade so it has a one way pair but in reverse order.

MD 139 SB crosses over its NB lanes at grade to be aligned on St. Paul Street which is east of Charles Street that carries one way NB MD 139 in Baltimore.

[SSOWorld]

I agree - do not trust the routing Google Maps (or any map engine) has laid out - they don't know

AZ SR 87 (Beeline Hwy) does a crossover of itself similar to I-5 and I-8.

As a matter of opinion, trumpet interchanges (especially the standard ones) should not be included in this category because they do this by design.  The same should be the same for Diverging diamond interchanges, Cloverleafs, etc.

[pianocello]

Similarly, IL 97/29 in Springfield crosses over itself to connect to a one-way pair: https://goo.gl/maps/Hl8va. The eastern end of the pair is at-grade, and the western is an overpass.

EDIT: Huh, they rerouted 29 around town since the last time I was there.

[roadman65]

Then should we consider US 1 in DC that way?  It NB alignment crosses its SB alignment just north of the 14th Street Bridge to continue on 14th St. SW while the SB US 1 is concurrent with I-395 SB as it uses the 9th Street Tunnel instead of 14th Street and avoids using Constitution Avenue like its NB counterpart does.  Then also, at grade, NB crosses SB again at Constitution Avenue at 9th Street NW.

[kurumi]

Until the late 1970s, I-84 had a short crossover near the Brass Mill in Waterbury (exit 22).

1965 aerial photo is here: http://cslib.cdmhost.com/cdm/singleitem/collection/p4005coll10/id/12303

Only source I have on the fix right now is the contract award in 1976 -- "State Awards Contract for I-84 Project", Hartford Courant, Sept. 3, 1976

EDIT: in Connecticut :-)

[jakeroot]

Not a highway, but East Sky Harbor Blvd at PHX crosses over itself for most of its length through the airport:

[Duke87]

Also, I-70 does this within tunnels at MM 125 in Glenwood Canyon

https://goo.gl/maps/6Snq7

No it doesn't. That's just poor map data approximating the eastbound tunnel as two straight lines instead of the curve it actually takes. The two tunnels don't cross.


For another former example, I-84 as originally built had a crossover at exit 22 in Waterbury, CT.
Here is a 1965 aerial photo:


Same spot today: https://www.google.com/maps/@41.550052,-73.0309227,1094m/data=!3m1!1e3

Yes, those two photos are the same spot. Surroundings have changed a lot in 50 years as well, eh?

This was modified to a more normal configuration the highway was widened from 4 to 6 lanes. In doing so the left exit and entrance for eastbound traffic were eliminated.

[jakeroot]

For another former example, I-84 as originally built had a crossover at exit 22 in Waterbury, CT.
Here is a 1965 aerial photo:

Same spot today: https://www.google.com/maps/@41.550052,-73.0309227,1094m/data=!3m1!1e3

Yes, those two photos are the same spot. Surroundings have changed a lot in 50 years as well, eh?

This was modified to a more normal configuration the highway was widened from 4 to 6 lanes. In doing so the left exit and entrance for eastbound traffic were eliminated.

Kurumi already mentioned this one.    I don't know about you, but sometimes with these listing threads, it becomes a too long; didn't read type of thing and things up getting double posted a lot in my experience.

[amroad17]

NY 363 in Binghamton, NY.  The entrance ramp to eastbound NY 363 from NY 434 is north of westbound NY 363.  They cross over about 1/4 mile east of NY 434.