Long stretch of highways without curves

[kphoger]

Some from northern México:

60.7 miles - Highway 97 heading south from Reynosa, Tamps
42.7 miles - Highway 85 heading south from Nuevo Laredo, Tamps (and, let me tell you, it is one boring highway)
39.4 miles - Highway 57 heading north from El Huizache, SLP

[national highway 1]

Australia motherfucker.

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

The 90 mile straight on the Eyre Hwy is basically 144km of straight road across the Nullarbor Plain.
The trans Australian railway from Adelaide to Perth runs straight for 478km (297mi) from Ooldea in SA to Loongana WA.

[mgk920]

There are several fairly long straight sections of WI 29 in Wisconsin, especially between Wausau and Abbotsford.  Very hilly, but also very straight.

Also, WI 173 is arrow straight and dead level for about 20 miles/32 km between WI 80 at Babcock and just north of WI 21 at Valley Junction.

Mike

[theline]

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.

I-70 in East Central Indiana has some straight sections, but it's "companion" US-40 is straighter. Built mostly along the route of the old National Road, it has an arrow-straight 27 mile stretch from Knightstown to I-465 on the east side of Indy. It went a few miles longer until 40 was rerouted from Washington Street to bypass the city on 465. Another straight stretch of 40 west of Indy is nearly as long.

There are many other examples in Northern Indiana, mostly among east-west routes. (North-south routes most often jog slightly at section lines.) The stretch I travel most often is one of 38 miles, SR-26 from Fairmount to spot west of Russiaville. There are probably longer ones that I've not found yet.

[Mr_Northside]

If 2-lane highways count, US-30 has a rather long stretch of straightness in Somerset County (just east of the entrance to the Flight 93 Memorial)

[kphoger]

If 2-lane highways count...

This isn't SkyscraperCity, so yes, they count.

[Some_Person]

This 23 mile segment of FL 528 is arrow-straight. http://goo.gl/maps/KYHZF

I feel like, compared to all these straight roads, this section of I-84 and US 30 is probably the curviest: http://goo.gl/maps/c78DO

This segment of the PA Turnpike Northeast Extension is rather straight: http://goo.gl/maps/OvzCj

This segment of Route 1 in New Jersey looks arrow-straight: http://goo.gl/maps/RUr0i

[1995hoo]

US-27 from roughly the Krome Avenue intersection west of the Miami area to a point just south of Lake Okeechobee has minimal curves–basically two or three very minor ones that are similar to I-75 across the Everglades. If I-75 makes this list, then this portion of US-27 (which is a tad under 60 miles) belongs here as well.

Florida State Route 70 has a roughly 44-mile straightaway between Brighton and Arcadia that is interrupted by a small curve to avoid a minor lake just west of US-27.

The Bee Line isn't really long enough to make this list, but the traffic speeds certainly reflect the road's ramrod-straight nature.

Ontario 402 has roughly a 40-mile straightaway (with one minor curve at the western end) east of Sarnia).

[kphoger]

Let's steer away from highways that are straight as an arrow except for this one curve in the middle.  Lots of highways are straight except for their curves.

What comes close to the Australian example?