Highest speed limit on an undivided highway?

[corco]

U.S. 90 outside of Del Rio - 75
U.S. 385 outside Big Bend -75
Every other U.S. highway in Texas - 70
State routes are usually 70 then have sAdopted
igns saying "Truck Speed Limit - 60". But most roads in Texas are 70.
BigMatt

And a couple others- I know for sure US 67 north of Fort Stockton is 75 for a bit, as is 62/180 after the Guadalupe Mountains but before El Paso County

[agentsteel53]

I bet there are some 75 mph speed limits on any freeway that is undivided.

there are.  and on standard two-lane roads.  see: west Texas.

I think some Nevada two-laners are 75 too, but they might just be 70.

[Revive 755]

It alternates 55-60 from Wyoming to Grand Island, then I think it's mostly 65 from Grand Island to Iowa. It's definitely never 70 (except maybe the Fremont bypass, but I don't think so- but that's a freeway anyway).

There's 65 mph sections on US 30 either side of North Platte, but east of Gothenburg it tops out at 60 in the rural sections.  There are probably some 65 mph expressway sections between Grand Island and Iowa, but Nebraska never allows a speed limit of 70.

Pre-NMSL, Missouri supposedly allowed 70 on US highways - may have applied to non-divided and two lane sections.

Illinois allowed 65 on two laners pre-NMSL.

[Bryant5493]

There's a portion of U.S. 72 east of Stevenson, IIRC, that's five lanes (2 east, double left turn lane, 2 west) undivided, with a 65 mph speed limit.


Be well,

Bryant

[KEK Inc.]

I have heard the United Arab Emirates has the speed limit of 160km/h (99mph) on several roads built for high speed.  Are any of those two-laners?

(as far as I know, 160 km/h is the highest numerically well-defined speed limit on the planet.)

To my knowledge, they have like 4 lanes each direction.  I think I saw the road on Top Gear once, when they drag raced a Lamborghini Murcielago with a Mercedes McClaren.

I know Oregon has a cap of 55 pretty for undivided and 65 for freeway due to their strict speed limit law.  I know the ODOT spokesman, and he claims ODOT wants to raise the speed limit, but the state government doesn't want to (because they allow 3-trailer trucks).  

I can't think of an undivided 2-lane highway in California over 55.  There are several expressways at 65 that don't technically have dividers.

On a side note, I generally go down county roads at 70-90, but I slow down at state roads since they're generally full of cops.

[Removed unnecessary styling. -S.]

[roadfro]

I think some Nevada two-laners are 75 too, but they might just be 70.

Nevada two-lane highways are 70 mph maximum. Some rural Interstate stretches (I-15, possibly parts of I-80) have 75 mph maximums.

[agentsteel53]

Nevada two-lane highways are 70 mph maximum. Some rural Interstate stretches (I-15, possibly parts of I-80) have 75 mph maximums.

that is what I had been thinking of.  and yes, a lot of 80 is 75.  heading east out of Sparks, the first 75mph comes up fairly quickly, around Patrick or so, and it is mostly 75 all the way out to Utah.  There's a few drops to 65 in the larger towns (Elko, Winnemucca, etc), but for the most part it's all 75. 

Hell, apart from a few cities and towns, I-80 is 75mph basically from Reno to Omaha!

[agentsteel53]

I can't think of an undivided 2-lane highway in California over 55.  There are several expressways at 65 that don't technically have dividers.

US-395 approaching the Nevada state line from the south is the first thing which comes to mind.  Two-laner, 65mph.  there are plenty of such roads out there; in fact I am venturing a guess that that is CA's default for rural two-laners unless a certain population density threshold is exceeded.

[myosh_tino]

I can't think of an undivided 2-lane highway in California over 55.  There are several expressways at 65 that don't technically have dividers.

US-395 approaching the Nevada state line from the south is the first thing which comes to mind.  Two-laner, 65mph.  there are plenty of such roads out there; in fact I am venturing a guess that that is CA's default for rural two-laners unless a certain population density threshold is exceeded.

According to the California vehicle code (CVC) section 22349, the maximum speed limit on a two-lane undivided highway is 55 MPH (on a divided multi-lane highway it's 65 MPH) unless otherwise posted.  CVC section 22356 provides the language to increase the speed limit to 70 MPH on rural freeways with CHP approval.

I do know that the two-lane section of CA-58 from Barstow to the end of the 4-lane expressway west of Hinkley has a 60 MPH speed limit.

[citrus]

I can't think of an undivided 2-lane highway in California over 55.

There are some.... I know part of CA-78 out in Imperial County is 65, as well as a portion of CA-120 somewhere in between CA-99 and Yosemite, as well as the aforementioned stretch of CA-58 (though I remember that to be 65). I can imagine a lot of the flatter middle-of-nowhere highways (CA-62, perhaps?) have similar stretches, but I don't actually know for sure.

[The Premier]

55 m.p.h in Ohio for undivided highways.

[roadfro]

Nevada two-lane highways are 70 mph maximum. Some rural Interstate stretches (I-15, possibly parts of I-80) have 75 mph maximums.

that is what I had been thinking of.  and yes, a lot of 80 is 75.  heading east out of Sparks, the first 75mph comes up fairly quickly, around Patrick or so, and it is mostly 75 all the way out to Utah.  There's a few drops to 65 in the larger towns (Elko, Winnemucca, etc), but for the most part it's all 75. 

Hell, apart from a few cities and towns, I-80 is 75mph basically from Reno to Omaha!

I-80 is not 75 mph between Reno and Fernley -- it stays 65 a ways out of Sparks, then bumps up to 70 by Patrick or USA Pkwy. That jump to 75 must be after Fernley. Even still, that's quite a ways of 75 mph speed limits across the state--or several states, as you indicate.

[ethanman62187]

I hope the speed limit there may go up to 80 mph or 130 km/h in the future if 75 mph or 120 km/h is too slow.

[roadfro]

^ If you're talking about Nevada, it's unlikely. NRS 484B.600 subsection 1 gets in the way. It prescribes the state's maximum speed limit at 75 mph.

[Crazy Volvo Guy]

doesn't Mississippi go up to 65 on two-laners?  or Alabama?  I could swear I've seen some 65s on roads in those states.

US 72 between Rogersville and Athens was 65, it's 4 lanes with a double yellow.  I believe that's as good as it would have gotten here, and I say 'was' because the aforementioned stretch has since been reduced to 60.