Roads that cross themselves

[hotdogPi]

Get off I-405 onto Culver Dr. toward UCI (Irvine, CA). You will cross University Dr. soon. Continue straight for several miles. You will eventually be on University Dr. crossing Culver Dr. at the same intersection you saw before.

Any other roads that cross themselves unintentionally?

[Max Rockatansky]

How can a street intersect with itself?   It must be the nexus of the universe!

[Rothman]

QC 132

[ilpt4u]

Anywhere you have Wrong Way One Way Pairs, including DDIs, this occurs

But for a non-DDI, IL 92 in Springfield. I-5 near Castaic Lake in California. I-85 near the Davidson County Rest Area in North Carolina

I will say these are intentional crossings of one's self...I now see the OP is looking for "unintentional"

[GaryV]

The OP's example involves a loop, albeit a loop with several road names.  SB on Culver after crossing University, it becomes Bonita Canyon going SSW, then Ford going W, East Bluff going N and NE, which then becomes University going NE and E to the same intersection with Culver.

This is probably a situation repeated in many subdivisions around the country, as roads bend and twist and loop.

[epzik8]

This is a great example from my home county, Harford County, Maryland. It actually starts across the Mason-Dixon Line in York County, Pennsylvania.

Start out on PA-851 in the borough of Fawn Grove, Pennsylvania in York County. Turn right (going east on PA-851 out of Fawn Grove) or left (going west, entering the borough) onto Rocks Road. At at least one of those approaches, the westbound one, there is a sign stating “Bel Air, MD 17 (miles)”.

Follow Rocks Road a short distance south into Maryland, where it picks up the designation of MD-24. Continue south for several miles, during which time you will encounter a roundabout with MD-165, parallel Deer Creek through Rocks State Park, and pass through the retail and residential developments of Forest Hill. You will ultimately reach an interchange with U.S. 1, the Bel Air Bypass. MD-24 south branches off onto the first ramp to join U.S. 1 south. Instead of taking this ramp, keep going straight. This will put you onto MD-924, part of MD-24 until 1987. You will go past a traffic light whose cross roads are Vale Road and Moores Mill Road, straight through downtown Bel Air, and continue for a couple of miles into Abingdon. MD-924 curves to the right and ends at a diamond interchange with MD-24 seven and a half miles after it started at the Bel Air Bypass.

After going under the MD-24 bridge, you are now on Tollgate Road. Tollgate Road almost immediately curves to the right itself, meaning you have now made a U-turn and are headed back north toward Bel Air. MD-924 and Tollgate Road both parallel MD-24 between Bel Air and Abingdon, so where you were paralleling MD-24 to the east before, you are now paralleling it to the west. So Tollgate Road goes back up through the developments making up the west side of Abingdon. At the Wheel Road roundabout you transition back into Bel Air. When you get just past Bel Air South Parkway, you have reached a link crucial to this journey: the road from here to the Plumtree Road roundabout was not completed until June 2017; before that, there was a gap in the road at this point.

Continue past the Plumtree roundabout for a few more miles. You will pass the Upper Chesapeake hospital, three more roundabouts, the Harford Mall, underneath the Bel Air Bypass, and past the Harford County Equestrian Center, before finally reaching a pair of 90-degree turns just past Red Pump Road (which goes back to MD-24 at the last signal north of the Bypass interchange). The first turn is to the left, and the second is to the right; after the second turn, Tollgate Road’s name changes to Vale Road, which soon starts paralleling Winters Run. This whole time, you are still in the Bel Air ZIP code area. Eventually, Vale Road intersects Red Pump Road again, crosses over the Bel Air Bypass, and then comes the moment you’ve been waiting for: you reach MD-924 again, at the light you found yourself at earlier. Proceed straight onto Moores Mill Road and go east for a couple of miles before coming to MD-22 on the east side of Bel Air. To complete the trip, go straight at the light and go a short distance to the roundabout at the entrance to the Greenbrier Shopping Center.

[thspfc]

This happens a lot in suburban communities.

[TheGrassGuy]

* US-441 in Great Smoky Mountains National Park
* US 16A in Custer State Park (x3!)
* SD-87 in Custer State Park (there might be more in Custer that I'm forgetting about)
* Cedar Ln in Florence, NJ (the only one in NJ, I think)

I'm assuming you're excluding interchanges? Because literally every route that changes directions in a cloverleaf interchange qualifies.

[TheGrassGuy]

QC 132

Where?

[Rothman]

QC 132

Where?

Sainte-Flavie, QC

[Paulinator66]

I-70 at the infamous Breezewood, PA exit?

[TheGrassGuy]

I-70 at the infamous Breezewood, PA exit?

Oh yes, we can't forget THAT one.

[DJ Particle]

NJ-495, of course....   

[TheGrassGuy]

NJ-495, of course....   

Why you little monster you beat me to it

[OracleUsr]

I-77 Charlotte

[jp the roadgeek]

US 6 Eastbound in North Windham, CT at the end of the Willimantic bypass.  EB traffic loops under EB US 6/WB SR 649 and you end up on the overpass of where you just came from.

[debragga]

Hideaway Ln in Hunt County TX intersects itself and Hideaway Rd in a T-intersection: https://www.google.com/maps/@32.9556019,-96.0457336,16.5z

[DJ Particle]

US 6 Eastbound in North Windham, CT at the end of the Willimantic bypass.  EB traffic loops under EB US 6/WB SR 649 and you end up on the overpass of where you just came from.

Not sure if that counts, because then any interchange that does that would count, like US-6 westbound north of the Sagamore Bridge

[CNGL-Leudimin]

Physically, I-76 where it bumps with I-80 in Ohio.

And since people have started posting places where roads loop over themselves, I know of 5 such loops in Spain (one of them is barely, a few feet away it would have been in France instead). And there are at least 5 expressway loops in China.

[theline]

Is it cheating to count this? It crosses over itself, though there isn't an intersection.
Pigtails by Tom Heline, on Flickr

[TheGrassGuy]

Is it cheating to count this? It crosses over itself, though there isn't an intersection.
Pigtails by Tom Heline, on Flickr

I already posted this but thx for the image.

[TheGrassGuy]

Here's a long and convoluted one near where I live.

Begin in Roseland at the intersection between Eagle Rock Ave (Essex CR 611) and Livingston Ave (CR 527), just north of Livingston and I-280. From there, head south on Livingston Ave (CR 527), through the I-280 interchange. As Livingston Ave enters the namesake township, it gains the N prefix, and then the S prefix as it crosses Mt. Pleasant Ave (NJ 10), which gains the prefix W or E itself depending on which side of N or S Livingston Ave it is on. At E Cedar St, CR 527 will depart from S Livingston Ave at a left turn, but keep following S Livingston Ave, which is now Essex CR 649. After W or E Hobart Gap Rd (Essex CR 608), Essex CR 649 gets a cool Jersey barrier and becomes John F. Kennedy Pkwy. It even gets a diamond interchange with Parsonage Hill Rd (Essex CR 606); pretty cool, huh?

At NJ 24, which also happens to be the Union-Essex county border, John F. Kennedy Pkwy changes its name to River Rd, but the number still stays across the county line as Union CR 649. Union CR 649 branches off to the left as Passaic Ave (this is where our journey will end, eventually), but River Rd continues straight across the Passaic River, and then the Morris-Union county border, without a number.

Keep going straight until the traffic light at Watchung Ave, where we unfortunately run into a small problem. Watchung Ave, continued by its successor Shunpike Rd, ends at Loantaka Way (Morris CR 636) near Madison. Here, we have to bend the rules a little, and our journey would have come to an end here, if it weren't for the fact that the road on the left is River Rd. After gaining the Morris CR 647 designation from Southern Blvd, River Rd continues until we arrive at the same situation at Passaic St, on which Morris CR 647 continues south. Thankfully, the River Rd name saves the day again, and thus we can continue. At the Long Hill-Chatham township line, River Rd becomes Long Hill Rd, and later gains the Morris CR 657 designation. Everything is fine until we reach a five-way intersection at Millington, where Long Hill Rd makes a turn to the southwest, continuing as a suburban road and then terminating prematurely. However, it is the county route number this time that lets us continue. Morris CR 657 leaves Long Hill Rd and continues northwest as Basking Ridge Rd, all the way to the Somerset-Morris county line.

Once in Somerset County, the road is named S Maple Ave and retains its previous number as Somerset CR 657. Passing through downtown Basking Ridge, it loses its county route status, and its prefix changes to N. After passing across I-287 at an interchange and reaching US 202, it changes its name to Childs Rd and gains the Somerset CR 613 designation. Before long, however, the road loops back down south to US 202 and under I-287 again, becoming N Finley Ave and then S Finley Ave once passing through downtown Basking Ridge once more. From there, the road becomes Lyons Rd and Somerset CR 640. At Liberty Corner, the westernmost point of our journey, Somerset CR 640 ends, we "merge" onto CR 512, and the road name changes to Valley Rd.

Valley Rd runs well past the Somerset-Morris county line (though not without having to make two bends in the rules), and then all the way up to the Morris-Union county line, Springfield Ave succeeding it. Everything works fine until east of New Providence, near the railroad overpass. Instead of remaining on CR 512 and Springfield Ave, which both end in eastern Summit, here we have to make one last bend in the rules. This time, it is the general shape of the road that dictates how we proceed rather than the name or the number. In order to complete our giant loop, we now have to keep left on Constantine Pl (Union CR 649; sounds familiar?). Constantine Pl T-intersects with Passaic Ave, which is thankfully also Union CR 649. Finally, Passaic Ave T-intersects with River Rd.

41.4 miles. 1 hour and 24 minutes. Epzik8's loop is only 31.0 miles and takes 1 hour. Can anyone beat this using only local and county roads?

Google Maps directions of the route described: https://www.google.com/maps/dir/40.8209004,-74.2965635/40.7288084,-74.3787357/@40.7286305,-74.3807678,17z/data=!4m34!4m33!1m30!3m4!1m2!1d-74.4873548!2d40.6814918!3s0x89c3bb6468860cb1:0x8c4b43836b452eb9!3m4!1m2!1d-74.5530269!2d40.7278578!3s0x89c3a2d8d5dfd601:0x54f5d864108db4f4!3m4!1m2!1d-74.5547574!2d40.6805003!3s0x89c3bd069ed9aaf1:0xef458e8b0f34c721!3m4!1m2!1d-74.5784006!2d40.6659665!3s0x89c3bd90518cc943:0x5816c74561759656!3m4!1m2!1d-74.4277779!2d40.6927188!3s0x89c3bab623329401:0xe464f3653520f2fd!3m4!1m2!1d-74.3861792!2d40.7137614!3s0x89c3af94e45b571d:0xf9bacadff103c5eb!1m0!3e0

[webny99]

Is it cheating to count this? It crosses over itself, though there isn't an intersection.

I already posted this but thx for the image.

Ha, I was just about to reply and say "there's something similar in South Dakota near Mount Rushmore".
I decided to look it up, only to find out, of course, that this is it.

For some unknown reason, I had 19A in my mind as the route number. We've got it covered, in any case!

[Terry Shea]

If a road crosses itself does that mean it's a catholic road? 

[kphoger]

If a road crosses itself does that mean it's a catholic road? 

Depends which direction.