Long stretch of highways without curves

[golden eagle]

US 82 through between Leland and Indianola is about 20 miles or so. There's also another long stretch between Indianola and Greenwood. US 49 from north of US 98 in Hattiesburg goes quite a ways without curves. I also recall I-70 through Indiana being quite straight, though I was not a driver the last time I rode through that part of the country.

[NE2]

Australia motherfucker.

[Sanctimoniously]

Australia motherfucker.

http://en.wikipedia.org/wiki/Eyre_Highway

[oscar]

In the U.S., probably I-80 through western Utah, about 44 miles between Blair and Clive.  Not only arrow-straight, but also incredibly desolate and boring. 

I-5 between CA 99 and CA 152, which is even longer, would be a possibility, though the map indicates some very gentle curves that would make it not completely straight. 

[Zmapper]

I-80 from Grand Island to Lincoln, Nebraska, is near-perfectly straight for over 80 miles.

[Big John]

I-94/US 41 through Racine and Kenosha Counties in Wisconsin for 24 miles.

[Takumi]

VA 40 has some straight stretches of a couple miles each in Sussex and Dinwiddie Counties. Not really impressive.

[deathtopumpkins]

US 460 between Petersburg and Suffolk, VA. Also US 13 on the Eastern Shore has some pretty straight stretches, as do many of the swampy roads in North Carolina, and NC 12 on the Outer Banks.

I can't think of anything here in New England though.

[mcdonaat]

US 61 - 18 miles between LA 939 and the cutoff to LA 3125. Also, US 190 has some straight stretches between LA 413 and LA 1145, along with LA 81 to a curve before LA 1. Aptly named Airline Highway.

25 miles of US 190 and LA 383 from Basile to Kinder.

55 miles of US 165 between I-10 and LA 113. Not perfectly straight, but it has some bows where right of way becomes a factor.

[Kacie Jane]

I'm fairly certain the highway pictured in my avatar is perfectly straight.  Ironically, however, recent improvements included installing roundabouts in one section, so while the centerline may be straight, driving to Lynden does require some steering.

[vdeane]

I-75 through the Everglades is very straight too.

[bugo]

The Turner Turnpike is mostly long straight stretches with few curves.

[doorknob60]

These are the first two that came in my head. Since I was a kid, every time I thought of "straight highway", OR-138 came to mind, for whatever reason.

OR-138 from US-97 to Crater Lake turnoff: 14.7 miles, one tiny turn, but I've driven it, it's essentially straight the entire way. I find this one surprising due to it being in the mountains and stuff, but still managing to be one of the straightest highways in the entire state. Now that I look at it, US 97 south of 138 is straight for a long time too.

US 20/26 from Caldwell, ID to south of Eagle, ID: about 16 miles, just a suburban and rural road through farmland, there's a large grid of straight roads form Caldwell to Boise.

[jp the roadgeek]

The NJTP south of exit 10 or so is pretty straight.  But then again, why do they call them turnpikes when they're generally straight?

[deathtopumpkins]

The NJTP south of exit 10 or so is pretty straight.  But then again, why do they call them turnpikes when they're generally straight?

Because back in the early days of roads, the barriers at toll booths were called "pikes". So someone turned the pike to let a traveler pass.

[signalman]

The NJTP south of exit 10 or so is pretty straight.  But then again, why do they call them turnpikes when they're generally straight?

Because we drive on parkways and park in driveways.  Only kidding, deathtopumpkins answer is the correct one.

[JREwing78]

The UP in Michigan has a notorious one: the 24-mile Seney Stretch on M-28 between Shingleton and Seney.
http://goo.gl/maps/GM6VL

This one doesn't even have any vertical curvature to speak of, aside from that of the Earth.

[roadman65]

How about US 1( and part of US 1 Business) between North Brunswick and Trenton being called the "Straight Turnpike" because it is that from the Brunswick Circle in Lawrence to NJ 91 in North Brunswick.  The proper name is Brunswick Turnpike (however businesses use US 1 as street address), but that was a nickname that was even place in parentheses next to the real name on some older maps.

Nova Road (CR 532) in Osceola County, FL has a 13 mile straightaway with a few vertical curves over brooks and drainage ditches.  I once did 90 mph back in the mid 1990's as the roadway is not traveled that much.  However, with Texas going 85 that number is not that high anymore.

[cpzilliacus]

Strangely, the East-West Mainline of the Pennsylvania Turnpike (I-76), correctly known as a freeway with many curves, has a very long and arrow-straight section between Carlisle and the entrance to the Blue Mountain Tunnel. 

[roadman65]

Strangely, the East-West Mainline of the Pennsylvania Turnpike (I-76), correctly known as a freeway with many curves, has a very long and arrow-straight section between Carlisle and the entrance to the Blue Mountain Tunnel. 

Actually just to the East of Blue Mountain Interchange is the west end of the straightaway.

[US12]

There is a 64 mile stretch of Iowa 3 with no curves from west of Pocahontas to east of Clarion.

[roadman65]

US 27 Alternate in Levy County, FL has only one slight curve between Chiefland and Bronson.

I-95 has many straightaways in Flagler, Volusia, and many other FL roads it is quite common.

US 1 north of St. Augustine as you approach the Nation's Oldest City has a nice long straight line into town.  At night you can see the traffic signal just south of the City Gates turn many times before you actually reach it.

Southern Delaware between US 9 and DE/ MD 54 is straight.  At night traveling Southbound you can see the DE/ MD 54 signal several minuets before arriving there along with many orientations en route just like in St. Augustine.

US 27 from I-75 northward has three long straightaways in the 40 somewhat miles to South Bay that is worth mentioning as it is most cool to drive despite the lack of scenery. 

despite ( I believe I used it right)

[Ian]

The Northeast in general doesn't have too many stretches of road that are long and straight, but there are a few that come to mind...

-NJ 72 in the New Jersey Pine Barrens. It's mostly a flat two-lane highway with a dotted yellow line on 90% of its length, with lots of visibility ahead.

-Pennsylvania Turnpike (I-76) between exit 201 (Newburg) and I-81 in Carlisle. There is a 12-13 mile section of that road that's straight as a bullet, however, it does have rolling hills.

-There are several very straight sections of the Northeast Extension (I-476) south of Allentown.

[roadman65]

Speaking of rolling hills on straight highways, you must see GA 17 north of Wrens, GA.  There is one part of roadway that drops in elevation  gradually and deep in the middle of a straight path that is long that gives the most wonderful driving experience ever!

[Roadsguy]

(I'm exaggerating a whole lot.)

I-78 from its western merge with US 22 to Hamburg, PA.

Very straight, few curves, all curves are slight, and pretty boring...