Route A ends at route B, and vice-versa.

[Max Rockatansky]

CA 158 on the June Lake Loop starts and ends at US 395. 

[DJ Particle]

MA-6A starts at US-6 Exit 55 (1C) - AFAIK anyway, I think they finally officially routed it along the old US-6 bridge approach (which Exit 55 feeds into on the Westbound side).

US-6 then ends at MA-6A at Herring Cove, in Provincetown.  Granted, MA-6A ends there as well.   

[michravera]

This is a thread about routes that have an end at a route that began or ended at the former route (route A ends at route B, route B ends at route A). They can be state routes, county routes, U.S. highways, or Interstates. This does not count routes that transform into a different route along the same ROW (like I-76 and NJ 42), but if two routes end at the same point it does.

PA 26 ends at PA 150, which started at PA 26 ~20 miles before.
PA 997 ends at PA 233, which had started at PA 997 ~50 miles before.
I-64 ends at I-664 and I-264, the former of which begun at I-64 ~20 miles before.

Here's a "sort of":
CASR-99 starts a I-5 near Wheeler Ridge, CA
I-5 ends at BC-99 near the USA/Canada International Boundary

[Hwy 61 Revisited]

This is a thread about routes that have an end at a route that began or ended at the former route (route A ends at route B, route B ends at route A). They can be state routes, county routes, U.S. highways, or Interstates. This does not count routes that transform into a different route along the same ROW (like I-76 and NJ 42), but if two routes end at the same point it does.

PA 26 ends at PA 150, which started at PA 26 ~20 miles before.
PA 997 ends at PA 233, which had started at PA 997 ~50 miles before.
I-64 ends at I-664 and I-264, the former of which begun at I-64 ~20 miles before.

Here's a "sort of":
CASR-99 starts a I-5 near Wheeler Ridge, CA
I-5 ends at BC-99 near the USA/Canada International Boundary

Another "sort of":

US 61 ends at I-35 in Minnesota. I-35 ends at MN 61 in Duluth, MN.

[Max Rockatansky]

This is a thread about routes that have an end at a route that began or ended at the former route (route A ends at route B, route B ends at route A). They can be state routes, county routes, U.S. highways, or Interstates. This does not count routes that transform into a different route along the same ROW (like I-76 and NJ 42), but if two routes end at the same point it does.

PA 26 ends at PA 150, which started at PA 26 ~20 miles before.
PA 997 ends at PA 233, which had started at PA 997 ~50 miles before.
I-64 ends at I-664 and I-264, the former of which begun at I-64 ~20 miles before.

Here's a "sort of":
CASR-99 starts a I-5 near Wheeler Ridge, CA
I-5 ends at BC-99 near the USA/Canada International Boundary

I wish that was still true...in US 99 form of course.  CA 99 doesn't even reach I-5 at it's north terminus these days and stops at CA 36. 

Oddly AZ 202 now actually does start and end at I-10 with the new segment open.  ADOT as of recent decades has been really against highways starting and ending at the same route for some reason.

[NWI_Irish96]

This is the closest I can get involving Indiana.  IN 64 ends at IL 15, and IL 15 ends at I-64.

Indiana being on a grid doesn't lend itself well to this type of situation.

[thspfc]

I have a "sort of but not really" in Wisconsin. I-41 and I-43 basically end at each other in Green Bay, but I think it would be most accurate to say that I-43 ends at I-41 because US-41 continues as a freeway northward for 15 miles. In Greenfield, the interchange between I-41, US-41, I-43, US-45, and I-894 (!) is the last point on I-41's route where it is not multiplexed with another 2di.

So, you could say that if WISDOT wasn't quirky with their concurrences and their interstate termini, this would qualify. For now, it does not.

[dvferyance]

Not sure if County routes count in this thread but in Walworth County WI Hwy ES ends at Hwy A which originally started at Hwy ES.

[hbelkins]

This is the closest I can get involving Indiana.  IN 64 ends at IL 15, and IL 15 ends at I-64.

And IN 64 ends at I-64. 

[Hwy 61 Revisited]

Not sure if County routes count in this thread but in Walworth County WI Hwy ES ends at Hwy A which originally started at Hwy ES.

County routes count cause it carries local cars and makes it good to find.

[dvferyance]

Not sure if County routes count in this thread but in Walworth County WI Hwy ES ends at Hwy A which originally started at Hwy ES.

County routes count cause it carries local cars and makes it good to find.

Actually my own residential street does this it ends at another street  which started from my own street.

[Hwy 61 Revisited]

Not sure if County routes count in this thread but in Walworth County WI Hwy ES ends at Hwy A which originally started at Hwy ES.

County routes count cause it carries local cars and makes it good to find.

Actually my own residential street does this it ends at another street  which started from my own street.

One near me ends at another street, but the right-of-way ends at itself.

[TravelingBethelite]

Not sure if County routes count in this thread but in Walworth County WI Hwy ES ends at Hwy A which originally started at Hwy ES.

County routes count cause it carries local cars and makes it good to find.

Actually my own residential street does this it ends at another street  which started from my own street.

One near me ends at another street, but the right-of-way ends at itself.

How's that work?

[Hwy 61 Revisited]

Not sure if County routes count in this thread but in Walworth County WI Hwy ES ends at Hwy A which originally started at Hwy ES.

County routes count cause it carries local cars and makes it good to find.

Actually my own residential street does this it ends at another street  which started from my own street.

One near me ends at another street, but the right-of-way ends at itself.

How's that work?

The one street turns right at a T-intersection, going along the right-of-way at a street that ends at it. It then ends at that same street not long after. While the street doesn't end at itself, the right-of-way certainly does.

[webny99]

So, there doesn't seem to be an abundance of examples on the state/numbered highway level (simply because of the illogical nature of the situation numbering-wise) but we could inject some new life by going micro: this happens all over the place in residential neighborhoods!

This neighborhood alone has two such examples. Here's another one. And another. And finally, a quintessential example; the real-life version of the visual posted upthread!

Which neighborhood has the most examples? Surely there are some out there with 3 or more.

[TheHighwayMan3561]

ME 3 and ME 102 on Mount Desert Island.

[WNYroadgeek]

NY 265's southern terminus is at NY 266 in Buffalo.
NY 266's northern terminus is at NY 265 in Tonawanda.

[TheGrassGuy]

No examples in NJ,as far as I know

[Hwy 61 Revisited]

Interstate 19 ends at BL 19 in Nogales, Arizona. BL 19 ends at I-19 not far north from there.

[Max Rockatansky]

Interstate 19 ends at BL 19 in Nogales, Arizona. BL 19 ends at I-19 not far north from there.

I seem to remember that there was some sort of mandate a decade or so ago that no Arizona State Highway could start/end at the same route.  That seems to ring true through the State Highway system as previous examples like AZ 88 were partially spun off into AZ 188 and AZ 66 was truncated to the Yavapai County line.

[Hwy 61 Revisited]

Edge case I just found, but
NY 48 begins at I-690 west of Syracuse. NY 690 ends at NY 48 about five miles northwest of that.

[roadman65]

At one time US 13 ended at US 301 in NC with US 301 ending at US 13 in DE. Now US 13 ends at I-95 in NC as it was truncated some and US 301 has been realigned to first end at US 40 and now end at DE 1.

[bzakharin]

Now that the PA Turnpike / I-95 interchange is complete (at least for the thru I-95 movement), I-276 ends at I-295 and vice versa. Bonus points for the two not having an interchange with each other because both become I-95 in opposite directions.

Similarly, NJ 168 and the Atlantic City Expressway also end at each other without an interchange because both become NJ 42 in opposite directions.

[TheStranger]

An international example:

The south terminus of Metro Manila Skyway in Susana Heights, Muntinlupa is at the South Luzon Expressway:
https://www.google.com/maps/place/Susana+Heights+Subdivision/@14.4044277,121.0342476,16z/data=!4m6!3m5!1s0x3397d0de2d79d097:0x629b6e8b3e7e7e35!8m2!3d14.3736291!4d121.0378102!16s%2Fg%2F1tqfyw4f?entry=ttu

The north terminus of the South Luzon Expressway is a bit more nebulous, as it transitions into the Osmena Highway urban boulevard at the Magallanes Interchange with EDSA (which Skyway passes directly over), but the last limited-access link is at Metro Manila Skyway right at the Buendia Avenue ramp complex:
https://www.google.com/maps/place/Buendia/@14.5640791,121.0035282,17z/data=!4m6!3m5!1s0x3397c972fef9e02d:0x8b0d4a85b6b28ce4!8m2!3d14.5570646!4d121.0082382!16s%2Fm%2F05zly99?entry=ttu

(This interchange setup is also the unique situation where a preexisting diamond interchange, the 1979-era Buendia Flyover where SLEX/Osmena crosses over Buendia, has another, larger expressway viaduct directly above it which opened in 2019 -
https://www.google.com/maps/@14.5581806,121.0080658,3a,75y,245.63h,92.68t/data=!3m7!1e1!3m5!1sDkiRAgBKjj-Ckx8M6zpwiQ!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DDkiRAgBKjj-Ckx8M6zpwiQ%26cb_client%3Dmaps_sv.share%26w%3D900%26h%3D600%26yaw%3D245.63055252509645%26pitch%3D-2.6823188929213444%26thumbfov%3D90!7i16384!8i8192?coh=205410&entry=ttu )

Worth noting here is that three Skyway exits in Makati basically piggyback off of exits on SLEX/Osmena: Magallanes, Don Bosco, and Buendia.  Amorsolo Street's exit from northbound Skyway (with a corresponding onramp to southbound Skyway from A. Arnaiz Avenue (Pasay Road)) is the only one that independently links to the newer highway.

[Mapmikey]

At one time US 13 ended at US 301 in NC with US 301 ending at US 13 in DE. Now US 13 ends at I-95 in NC as it was truncated some and US 301 has been realigned to first end at US 40 and now end at DE 1.

US 13 has never ended at US 301 in North Carolina.  I believe the reason for this is that NC was trying to extended US 13 further southwest, using I-95 to Fayetteville, then along US 401 as they were trying to get US 13 extended to different points throughout the 1960s, Cheraw SC; Abbeville, SC; New Orleans LA