Longest east-west stretches along normally north-south highways, and vice versa

[KCRoadFan]

Along US 20, the longest road in the country, there are two roughly 100-mile stretches that largely run north-south - heading east, it goes mainly north from Idaho Falls to West Yellowstone, Montana, and later on, back south in Wyoming from Greybull to Shoshoni.

Meanwhile, on the East Coast, I-95 - along with parallel US 1 - spans the length of Connecticut east-west, also running about 100 miles, whereas down in Florida, I-75 (Alligator Alley) and parallel US 41 (Tamiami Trail) run just about the same east-west distance between Naples and the Miami area.

Also, back in the Northeast, I-95 and parallel US 1 from Baltimore to Philadelphia follow a primarily east-west trajectory, again spanning a little more than 100 miles. These are the examples I can think of - throughout the country, what other roads might there be that are mainly north-south but have a long east-west section, or vice versa? In addition, how long are these sections of highway that run perpendicular to the primary directional orientation of the road?

[Bruce]

WA 16 is signed east-west and treated as east-west (down to its even number), but most of it runs north-south.

Several sections of US 2 in WA are north-south, totalling about 60 miles.

[3467]

74 from Galesburg North is sharp. 74 and a lot of Interstates are diagonals. . No doubt about 74 thoigh.

[TheStranger]

US 101 has two key east-west segments:

1. in California, from Route 134/Route 170 in North Hollywood to Gaviota.  122 miles

2. in Washington, from Beaver to Blyn.  81 miles

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I-15 in the Mojave Desert has a diagonal-ish segment that is more eastward rather than pure northeastward or northward, from Barstow to Wheaton Springs for about 105 miles

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California examples:
Route 78 (mostly east-west) has one north-south segment from county route S34 east of Glamis, north to I-10 in Blythe, for about 44 miles.

I-80 in California runs primarily north-south from the MacArthur Maze to I-505 in Vacaville (coincidentally, this was the segment that would have been part of planned I-5W before the 1964 renumbering), for about 48 miles.

Due to geography, Route 49 from Oak Valley to Sierra Brooks runs mostly east-west for 65 miles.

Although Route 70 is ostensibly an east-west route overall (using portions of former Route 24 and former Alternate US 40), the north-south portion is 94 or so miles, from Route 99 in East Nicolaus to near Bald Eagle Mountain.

Route 96 is signed east-west from its terminus at Route 299, but the portion from Route 299 to Seiad Valley area is 93 miles north-south trajectory.

[roadman65]

US 92 in Florida from Lake Alfred to DeLand is more N-S while paired with US 17. I believe it's around 95 miles. 

[zachary_amaryllis]

US 40, after you come off Berthoud Pass into Winter Park, seems like it's much more north, than west.

Like, doesn't really turn back 'west' again, until you get to Rabbit Ears.

[Rothman]

Having lived in southeastern Idaho, US 20 is generally still perceived as an east-west highway, despite heading northeast to Yellowstone from Idaho falls.  Sort of like East and West Duluth, MN, come to think of it.

[SEWIGuy]

I-94 between downtown Milwaukee and downtown Chicago is almost entirely n/s for about 100 miles.

I-90 between Buffalo, WY and Crow Agency, MT is about 100 miles pretty much n/s. More of an extension of I-25 than anything.

[GaryV]

EDIT: Sniped on parts of this

Perhaps not longest segments, but I-94 has 3 - Madison to Portage, Chicago to Milwaukee, and Detroit to Port Huron (that one is overall northeast, but several north portions). And I-94 along south of Benton Harbor / St Joe is on quite an angle as well.

I-90, Rockford to Portage. Another section in WY and MT is pretty much n/s too.

[Mapmikey]

Nominating the entire state of South Carolina.

Fairly recently they changed the direction banners on nearly the entire system such that even numbers are posted E-W and odd numbers are posted N-S.

Except their route numbering system wasn't developed with that in mind 80-100 years ago.

Egregious examples of longer routes are SC 5, SC 9, SC 20, SC 45, SC 61, SC 63 

[epzik8]

Nominating the entire state of South Carolina.

Fairly recently they changed the direction banners on nearly the entire system such that even numbers are posted E-W and odd numbers are posted N-S.

Except their route numbering system wasn't developed with that in mind 80-100 years ago.

Egregious examples of longer routes are SC 5, SC 9, SC 20, SC 45, SC 61, SC 63

SC 9 is blatantly confusing in that regard; it's indisputably east-west.

[74/171FAN]

NC 55 is signed entirely east-west, but it truly a north-south route from its western terminus in Durham to Erwin at US 421.

[mgk920]

I-94 between downtown Milwaukee and downtown Chicago is almost entirely n/s for about 100 miles.

Farther than that, it doesn't turn eastward until the interchange with I-80/294/IL 394  in the south suburbs.  One of the minor reasons why I-41 was duplexed with it was to give at least that part of the road a proper north-south route number.

Mike

[Quillz]

The post-1964 extension of CA-1 is almost exclusively east-west between Santa Monica and Oxnard. Likewise, the northernmost alignment between Rockport and the Leggett Junction is windy and twisty, but is more west-east than south-north. Although this was a compromise, as CA-1 was intended to travel farther north to Ferndale.

[dlsterner]

There is a stretch of US 98 (nominally E/W) in Florida that runs generally N/S from Perry to Belle Glade (about 350 miles) before becoming E/W again towards West Palm Beach.

Been a while since I've been on it, but IIRC that section is actually signed N/S.

[jlam]

US 24 runs north-south between Vail and Buena Vista, Colorado, a total of nearly 70 miles.

[Hobart]

Interstate 69 runs about 130 miles from the north side of Lansing to Port Huron almost straight east, and is signed as such by MDOT. This portion of I-69 also appears to be slightly bowed, so there's portions that point slightly southeast (including the Blue Water Bridge) despite eastbound I-69 being "northbound" I-69.

[DriverDave]

 I-81, which is designated north-south, goes a huge distance east-west through Virginia and TN. It's more diagonal so I don't know if it counts here. Was going to say I-75 in Florida but see it was already mentioned. Although more of I-75 within the state is north-south than east-west, unlike I-95 in CT which is entirely east-west through the state.

[cwf1701]

I-94 between downtown Milwaukee and downtown Chicago is almost entirely n/s for about 100 miles.

Farther than that, it doesn't turn eastward until the interchange with I-80/294/IL 394  in the south suburbs.  One of the minor reasons why I-41 was duplexed with it was to give at least that part of the road a proper north-south route number.

Mike

And at the Indiana-Michigan Line, I-94 is more north-south to the interchange with I-196.  A lot of the North-South routing of I-94 in WI, IL, and MI is because of Lake Michigan.

[mgk920]

US 11 hugs the Canada-USA border east-west between I-81 and I-87 in New York, too.

Mike

[LilianaUwU]

QC 162 is signed east-west but is exclusively heading north-south. It should have been QC 163.

[roadman65]

South Carolina has plenty of them.  US 52 is signed E- W but is N- S in the state.

[TheHighwayMan3561]

In Minnesota:

TH 1 between Ely and TH 61 is about 60 miles mostly N/S but signed E/W.

TH 9 between Benson and New London is 35 miles, due E/W but signed N/S and features two prominent "wrong way" stretches - this segment shouid probably either be re-oriented or just given a different number

I've heard anecdotes that locals on the shore refer to TH 61 as an E/W route, but never investigated this myself. There is one local sign in Two Harbors referring to "61 West".

TH 92 is fully N/S but signed E/W from its "eastern" terminus at TH 200 north to the town of Clearbrook, 27 miles.

[Great Lakes Roads]

Another one in Michigan: I-196 runs more north-south than east-west.

[wriddle082]

South Carolina has plenty of them.  US 52 is signed E- W but is N- S in the state.

South Carolina has a huge problem with this.  They blindly assigned all even numbered state routes as E-W and all odd numbered state routes as N-S with absolutely no regard to how they actually travel.  One of the worst examples is SC 14, which is signed E-W, travels mainly N-S, and its northern endpoint is barely west of its southern endpoint.  At one point it is multiplexed with I-385 for a couple of miles.  SC 14 west turns left onto I-385 north, run with it for a couple of miles, then branches off to the right.

SC 9 is also another really bad example, as it is signed N-S but mainly travels E-W from the NC line near Spartanburg all the way to North Myrtle Beach, staying close to the NC line for a good chunk of the time.