Roads going the exact opposite direction that they're nominally signed for?

[CNGL-Leudimin]

Everyone knows about wrong-way concurrencies.  How about an east-west road that's going west-east, or a north-south road going south-north?

The main example I've found is US 6, about 3 miles from its eastern terminus.  West US 6 starts off going east-northeast, then starts to curve until about 3 miles in, West US 6 is pointing due east and East US 6 is pointing due west.

Unfortunately the US 6 reassurance sign is missing, but the West above it is there:

https://www.google.com/maps/@42.0658766,-70.1624561,3a,75y,82.66h,90t/data=!3m6!1e1!3m4!1sjsvSLkuVjMxVVL4iQhmwEg!2e0!7i13312!8i6656
I'm sure there are other examples; which ones do you know about?

Back when US 6 reached Long Beach, it also ended going the wrong way. It reached its Western terminus going due East.

[pianocello]

Eastbound US 92 heads west out of downtown Sanford, FL to get around Lake Monroe.

The OP mentioned routes that make a U-shape; Florida SR 434 is an example of this, though it changes from east/west to north/south somewhere along the way.

[crispy93]

Approaching the Triboro Bridge from Queens, I-278 eastbound is actually heading west (a wrong-way concurrency also occurs here, with the Grand Central Parkway. I don't know why the parkway doesn't just end at 278 but whatever...)

NY 9G in Poughkeepsie uses Washington St as it heads toward its terminus at US 9. It is heading north on Washington Street but is southbound 9G. There are no directional banners along this stretch.

[SectorZ]

The extended ME 112 in Gorham, extended to bypass the town, now extends due south for a couple of miles in its "northbound" direction.

https://en.wikipedia.org/wiki/Maine_State_Route_112#/media/File:Maine_State_Route_112_map.svg

[sturmde]

The extended ME 112 in Gorham, extended to bypass the town, now extends due south for a couple of miles in its "northbound" direction.

https://en.wikipedia.org/wiki/Maine_State_Route_112#/media/File:Maine_State_Route_112_map.svg

That's a perfect example!  It's very confusing that SOUTH 112 heads southwest, then curves and heads north from the roundabout with 114.  Really strange that Maine DOT chose to number it this way as an extension of 112.  It would have made much more sense to use any of the unused two-digit numbers Maine has skipped dating back to the New England Interstates days....  Should just white out one of the one's and make it ME 12.

[hbelkins]

Pretty common in this area where lots of roads either follow the meanders of streams, or have switchbacks across mountains.

[formulanone]

Alabama's SR 19 does this; it performs a fishhook / candy cane between the state line and ends at SR 17. Many routes do this, but the odd part is that the directional banner flips directions at the state line for Mississippi's SR 23. Head north on MS 23, then it's "south" on AL 19, or vice versa.

Cody pointed out that that segment in Red Bay, Alabama was former AL 24, until it was realigned.

[DandyDan]

The one Iowa example I know about is westbound Iowa 175 going due east with eastbound Iowa 141 as it crosses the Maple River before entering Mapleton.

[stevashe]

When the WA-167 extension is complete, the entire route will continue to use the current N/S scheme. Which is fine, because most of the route is oriented N/S, but the route will do this fish-hook turn thing when it's totally done.

More than a few people have suggested a new route number for this stretch, but WSDOT isn't budging for whatever reason.

I'd go with extending 410 as opposed to a new number, personally.

[wanderer2575]

All I can think of in Michigan is a short stretch of M-29 "north" of Fair Haven, between New Baltimore and Algonac.

https://goo.gl/maps/9NvfAjmBesY5AvHq8

[jakeroot]

When the WA-167 extension is complete, the entire route will continue to use the current N/S scheme. Which is fine, because most of the route is oriented N/S, but the route will do this fish-hook turn thing when it's totally done.

More than a few people have suggested a new route number for this stretch, but WSDOT isn't budging for whatever reason.

I'd go with extending 410 as opposed to a new number, personally.

That would be sufficient too! Anything other than what they're proposing, really.

[kurumi]

East of Boulder City, Nevada, Interstate 11 southbound crosses pure north to veer a little north-northwest: https://goo.gl/maps/3ruWcUhsEHHS4UW87

[jp the roadgeek]

US 62 counts, sort of.  Being an even numbered route, it is perceived to be an east-west.  For the last few miles at its "eastern" terminus (although it is signed north-south in PA and NY), you're headed west into Niagara Falls.

[sturmde]

US 62 counts, sort of.  Being an even numbered route, it is perceived to be an east-west.  For the last few miles at its "eastern" terminus (although it is signed north-south in PA and NY), you're headed west into Niagara Falls.

To be fair to Ohio, 62 was often signed S-WEST/N-EAST likewise 22 and 42, with 35 and 33 (and 250?)  S-EAST/N-WEST

[Hot Rod Hootenanny]

US 62 counts, sort of.  Being an even numbered route, it is perceived to be an east-west.  For the last few miles at its "eastern" terminus (although it is signed north-south in PA and NY), you're headed west into Niagara Falls.

To be fair to Ohio, 62 was often signed S-WEST/N-EAST likewise 22 and 42, with 35 and 33 (and 250?)  S-EAST/N-WEST

Something like that...

[Bruce]

US 101 at least avoids this with its east-of-the-mountains routing. While technically bound for its northern terminus (at Olympia, on the south end of the stretch), it is signed as south.

[TheHighwayMan3561]

Maybe too short to count, but was thinking of some of those Nebraska "wraparounds" involving two-lane roads where a grade-separated route crosses and then loops back to meet at a T-intersection; for example US 283 is going south at its northern terminus as it loops around to meet US 30.

[Super Mateo]

I was looking at a map of Metropolis, IL, and saw that US 45 has a short stretch like that.

[stevashe]

US 53 was recently rerouted near Virginia, MN to have a backtracking section. Bit of research reveals that this was done to allow mining along the previous alignment, which is interesting.

Satellite view on google maps even has the old routing still so you can compare: https://www.google.com/maps/@47.5080555,-92.5237512,2979m/data=!3m1!1e3

[Finrod]

I saw that US 1 near Calais, ME was mentioned, but there are also multiple places near its northern terminus where US 1 South goes due north and vice-versa.  Here's the first one in Fort Kent, complete with a South 1 sign visible while the camera is pointed due north:

https://www.google.com/maps/@47.2579359,-68.5898715,3a,75y,86.03t/data=!3m6!1e1!3m4!1sNOhRhv-GNZbfVkLSlX41VQ!2e0!7i13312!8i6656

There are several more a few miles down the road between Frenchville and Madawaska.

[Ned Weasel]

Not at all the exact opposite, but I-35 actually meanders in the opposite direction more times than you'll probably ever notice from driving on it.  There's about a mile's worth of opposite-direction travel in the Flatter-than-a-Pancake State: https://goo.gl/maps/TspVffEWgQjKqsTMA

[hobsini2]

A couple that come to mind in Wisconsin are Wis 44, signed North-South, (twice) by Fairwater and Manchester, US 151 around Downtown Madison, and Wis 22 by Waupaca.

[sparker]

NB CA 1 travels almost due south in Santa Cruz for part of the distance between the CA 9 junction and where it turns southwest onto Mission Street before following the curvature of the coast back to the north -- and, of course, SB CA 1 does the opposite. 

[jre1121]

WV state route 62 between Mount Alto and Mason is real head scratcher. 62 actually has an intersection and a concurrency with state route 2 that has the 2 roads signed together in opposite directions around Point Pleasant.

[CtrlAltDel]

I was surprised to see that the generally wrong-way part of I-25 in New Mexico, between Santa Fe and Las Vegas, has no directly opposite sections. Even the most out-of-whack bit, near Rowe if I'm not mistaken, is about 11 degrees short.