Highest speed limit that you have seen while on the road.

[webny99]

And, it is certainly conceivable that someone from Ontario has never seen a limit higher than that; especially if they don't travel much, given that NY and much of New England don't have limits higher than 65 mph. Heck, if I hadn't been west of Erie, PA, 110 km/h would be the outright highest speed limit (in terms of speed) that I have seen too!

What about the northern portion of US 15 in PA?  Or I-476?

Whoops. I did think about PA itself before positng, only long enough to consider I-90, which is all 65 mph except the awful 55 mph through Erie. My statement would have been accurate a few years ago, but you are right, PA does have some 70 mph segments now.

I've been on the 70 mph segment of US 15 a few times, and same for I-380, but I was not aware that I-476 is (partially?) 70 mph.

[sprjus4]

Most of I-476 is 70 mph IIRC, despite the substandard design.

PennDOT only posts 70 mph I believe on the turnpikes. US-15 is 65 mph.

Edit -
From my knowledge of driving some of Pennsylvania highways, I thought this was the case, but it appears I-99 has a 70 mph stretch, and isn't tolled or part of the Turnpike after looking on Street View.

[ftballfan]

And, it is certainly conceivable that someone from Ontario has never seen a limit higher than that; especially if they don't travel much, given that NY and much of New England don't have limits higher than 65 mph. Heck, if I hadn't been west of Erie, PA, 110 km/h would be the outright highest speed limit (in terms of speed) that I have seen too!

What about the northern portion of US 15 in PA?  Or I-476?

Whoops. I did think about PA itself before positng, only long enough to consider I-90, which is all 65 mph except the awful 55 mph through Erie. My statement would have been accurate a few years ago, but you are right, PA does have some 70 mph segments now.

I've been on the 70 mph segment of US 15 a few times, and same for I-380, but I was not aware that I-476 is (partially?) 70 mph.

Most of I-476 is 70 mph IIRC, despite the substandard design.

PennDOT only posts 70 mph I believe on the turnpikes. US-15 is 65 mph.

The worst 55 mph stretch in PA has to be I-70 south of Breezewood. There's little reason for it to not be 65

[sprjus4]

The worst 55 mph stretch in PA has to be I-70 south of Breezewood. There's little reason for it to not be 65

55 mph may be the posted limit, but the real speed is more like 70 - 80 mph. I once tried 55 mph driving that. I never passed anyone, and nearly got rear ended at least 10 times.

It drops from 70 mph to 55 mph as you cross the state line, and it's absurd.

Speed Limit 55 - Next 23 Miles; Welcome to Pennsylvania - https://www.google.com/maps/@39.7235765,-78.18383,3a,37.5y,25.63h,85.51t/data=!3m6!1e1!3m4!1sRlbWmoIKSEPxRlWMvvE7Fg!2e0!7i13312!8i6656

Welcome to Maryland; Speed Limit 70 -
https://www.google.com/maps/@39.7216259,-78.1854944,3a,75y,221.46h,78.31t/data=!3m6!1e1!3m4!1sFZX3esXuzxBw9b-vInjG2g!2e0!7i13312!8i6656

[signalman]

The worst 55 mph stretch in PA has to be I-70 south of Breezewood. There's little reason for it to not be 65

55 mph may be the posted limit, but the real speed is more like 70 - 80 mph. I once tried 55 mph driving that. I never passed anyone, and nearly got rear ended at least 10 times.

It drops from 70 mph to 55 mph as you cross the state line, and it's absurd.

Speed Limit 55 - Next 23 Miles; Welcome to Pennsylvania - https://www.google.com/maps/@39.7235765,-78.18383,3a,37.5y,25.63h,85.51t/data=!3m6!1e1!3m4!1sRlbWmoIKSEPxRlWMvvE7Fg!2e0!7i13312!8i6656

Welcome to Maryland; Speed Limit 70 -
https://www.google.com/maps/@39.7216259,-78.1854944,3a,75y,221.46h,78.31t/data=!3m6!1e1!3m4!1sFZX3esXuzxBw9b-vInjG2g!2e0!7i13312!8i6656

Substandard entrance and exit ramps are what most likely keeps this section of I-70 at 55.  PSP also has (or at least used to have) predatory enforcement of the 55 mph limit.  It's been a few years since I was last on that section, but any time I was ever on it, I saw several vehicles pulled over; presumably for speeding.

[vdeane]

I've been on the 70 mph segment of US 15 a few times, and same for I-380, but I was not aware that I-476 is (partially?) 70 mph.

Most of I-476 is 70 mph IIRC, despite the substandard design.

PennDOT only posts 70 mph I believe on the turnpikes. US-15 is 65 mph.

Edit -
From my knowledge of driving some of Pennsylvania highways, I thought this was the case, but it appears I-99 has a 70 mph stretch, and isn't tolled or part of the Turnpike after looking on Street View.

PennDOT and the Pennsylvania Turnpike Commission are separate entities.  The PTC basically raised everything that was previously 65 to 70 once their initial testing was done.  PennDOT is far more conservative, but parts of US 15, I-99, I-79, I-80, and I-380 all have 70 mph limits.

[1995hoo]

Most of I-476 is 70 mph IIRC, despite the substandard design.

PennDOT only posts 70 mph I believe on the turnpikes. US-15 is 65 mph.

Edit -
From my knowledge of driving some of Pennsylvania highways, I thought this was the case, but it appears I-99 has a 70 mph stretch, and isn't tolled or part of the Turnpike after looking on Street View.

The I-99 segment posted at 70 mph was definitely refreshing on our way back from Toronto this summer because it came after a couple of hours spent mostly on two-lane roads. They were pretty good two-lane roads, but because of the truck traffic it sure was nice to get to open it up again.

I-476 had lower speed limits in the Philadelphia area up to, IIRC, roughly the end of the work zone at the northern end of the widened portion; the speed limit also dropped through the tunnel and for the whole portion to the north of the end of the ticket system.

[Rothman]

I-84 in NY is the worst 55 mph limit.

[Roadsguy]

Most of I-476 is 70 mph IIRC, despite the substandard design.

PennDOT only posts 70 mph I believe on the turnpikes. US-15 is 65 mph.

Edit -
From my knowledge of driving some of Pennsylvania highways, I thought this was the case, but it appears I-99 has a 70 mph stretch, and isn't tolled or part of the Turnpike after looking on Street View.

As others have stated, US 15 is 70 mph, but only north of Trout Run.

The general rule with the Turnpike is 70 mph generally, with 55 mph through tunnels and toll plazas (as well as construction zones), plus the odd 45 or 35 mph zones approaching the ends of some of the extensions.

(Also, the toll roads in PA are owned and operated by the Pennsylvania Turnpike Commission, not PennDOT, including speed limits.)

[jakeroot]

Didn't realize how unusual 70 was in Pennsylvania. Last time I was out there (June), I went from DC up towards Victor, using US-15. Bit infuriating to enter into New York, switch to an interstate, and then suddenly have to bring it down to 65? I don't get it.

My point being, I've only driven a few major roads in PA, and one of them was posted at 70, so I would have thought it was a bit more common.

[sprjus4]

Didn't realize how unusual 70 was in Pennsylvania. Last time I was out there (June), I went from DC up towards Victor, using US-15. Bit infuriating to enter into New York, switch to an interstate, and then suddenly have to bring it down to 65? I don't get it.

My point being, I've only driven a few major roads in PA, and one of them was posted at 70, so I would have thought it was a bit more common.

From what I've seen, I wouldn't say it's unusual, just not the "norm". Just about every segment of turnpike is posted at 70 mph, with a few other freeways and interstate highways posted at 70 mph. The default speed limit though is 65 mph.

Compare that to, say, Virginia, where just about every highway was 65 mph (I-85 had an exception and was 70 mph since 2006) and when they raised the speed limit to 70 mph in 2010, just about all the rural interstate mileage was increased to 70 mph, it wasn't just a select few highways like in Pennsylvania.

New York ought to raise their rural speed limit to 70 mph. Same goes with New Jersey. On a road like the New Jersey Turnpike, it's easy to be flowing along smoothly with everybody else on the road, then look down at your speedometer and you're doing 80 - 85 mph. You don't really stand out though, because everybody else is doing that same speed essentially.

The turnpike could reasonably even be as high as 75 mph, but definitely should at least be posted at 70 mph.

[webny99]

Bit infuriating to enter into New York, switch to an interstate, and then suddenly have to bring it down to 65? I don't get it.

That's New York for you. The nice thing is, you don't really have to worry about a speeding ticket until you hit 80 (or speed limit +15), so traffic still moves along just as good if not better than it does in neighboring states.

Didn't realize how unusual 70 was in Pennsylvania. Last time I was out there (June), I went from DC up towards Victor, using US-15.
...
My point being, I've only driven a few major roads in PA, and one of them was posted at 70, so I would have thought it was a bit more common.

I wouldn't say 70 mph is rare in PA, but US 15 is actually one of the stranger 70 mph segments (IMO), which may be why, after seeing 70 on that road in particular, you assumed it was the norm. That stretch of US 15 is the only 70 mph segment I've been on period where I don't feel comfortable setting the cruise to upper 70's-80 mph, due to the curvature and the grades. Segments like this, for example, I would imagine being among the last rural freeways to switch to 70 mph, rather than the first.

If you're looking for a list of 70 mph segments, vdeane hit on all the main ones above. It's certainly not all of the rural freeways, but it's a pretty good chunk of them, including most everything maintained by PTC.
In fact, I-90, I-78, and I-81 (?) are the only 2di's that don't have any 70 mph segments. As I mentioned earlier, I-90 is still stuck at 65 mph, despite being significantly flatter and straighter than US 15 -- but 65 mph is a breeze compared to the 12+ mile 55 mph segment near Erie!

[webny99]

The turnpike could reasonably even be as high as 75 mph, but definitely should at least be posted at 70 mph.

If the speed limit on the PA Turnpike was 10 mph higher than the Thruway, I think that would be the biggest irony in roadgeek history. You literally couldn't have 2 more opposite extremes than those 2 roads when it comes to design standards, median widths, etc. 

[michravera]

70 for me.

I forget which airport it was that showed the "250Kt speed limit to 30 NM". That is the general rule in Class B airspace in the US, but one airport (it may have been foreign) actually POSTED the limit. I have never flown equipment that was capable of much above 200Kt.

[Rothman]

70 for me.

I forget which airport it was that showed the "250Kt speed limit to 30 NM". That is the general rule in Class B airspace in the US, but one airport (it may have been foreign) actually POSTED the limit. I have never flown equipment that was capable of much above 200Kt.

250 under 10,000 feet?

[sprjus4]

The turnpike could reasonably even be as high as 75 mph, but definitely should at least be posted at 70 mph.

If the speed limit on the PA Turnpike was 10 mph higher than the Thruway, I think that would be the biggest irony in roadgeek history. You literally couldn't have 2 more opposite extremes than those 2 roads when it comes to design standards, median widths, etc. 

Was referring to the New Jersey Turnpike when mentioning 75 mph.

The Pennsylvania Turnpike is appropriate at 70 mph. There's no way it would ever pass for higher, I'm surprised they even approved 70 mph, especially on narrow stretches like I-476 that have no room for error to the left.

[Scott5114]

I did the 85 mph limit on TX-130 in May. Felt absolutely surreal driving that fast legally, but it's easy to see why it's allowed–there's not too much traffic there, and it's much better than the 5 mph I got to go on I-35 through Austin on the way there.

[michravera]

70 for me.

I forget which airport it was that showed the "250Kt speed limit to 30 NM". That is the general rule in Class B airspace in the US, but one airport (it may have been foreign) actually POSTED the limit. I have never flown equipment that was capable of much above 200Kt.

250 under 10,000 feet?

It may have been. Also, I wouldn't be surprised if, for instance, Denver's Class B 250Kt limit applied all of the way up to FL180.

[US 89]

70 for me.

I forget which airport it was that showed the "250Kt speed limit to 30 NM". That is the general rule in Class B airspace in the US, but one airport (it may have been foreign) actually POSTED the limit. I have never flown equipment that was capable of much above 200Kt.

250 under 10,000 feet?

It may have been. Also, I wouldn't be surprised if, for instance, Denver's Class B 250Kt limit applied all of the way up to FL180.

Looks like Denver's class B ceiling is FL120: https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/vfr_class_b/media/Denver_Class_B.pdf

[KEVIN_224]

My highest speed limit, so far, is 70. That was on I-95/Maine Turnpike from Scarborough to (maybe) Kittery. Nothing is higher than 65 in Connecticut.

[kkt]

Highest number and highest 2-lane:  Mackenzie Highway, Northwest Territories, 110 km/h (68 mph for metric-challenged Yanks and Brits)

Highest speed recently:  75 mph in freeways in Wyoming, Utah, Idaho,

Highest speed limit on a non-state maintained road:  45 mph on the Golden Gate Bridge

I was on the rural highways of Nevada when there was no daytime speed limit, but I was a child then and not driving so I'm not sure it counts.

[michravera]

Highest number and highest 2-lane:  Mackenzie Highway, Northwest Territories, 110 km/h (68 mph for metric-challenged Yanks and Brits)

Highest speed recently:  75 mph in freeways in Wyoming, Utah, Idaho,

Highest speed limit on a non-state maintained road:  45 mph on the Golden Gate Bridge

I was on the rural highways of Nevada when there was no daytime speed limit, but I was a child then and not driving so I'm not sure it counts.

There are a lot of county maintained roads in Southern and Eastern Sacramento county (Hedge Road, Eagle Nest Road, eastern Kiefer Blvd, etc) that, to my knowledge, have NEVER had a speed limit sign. I moved away in 1991 and the bill reauthorizing the 65MPH speed limit (and defaulting 55MPH on unposted two-lane undivided roads) was in 1995-6. Sacramento County MAY have posted some 55MPH signs since then, but there weren't any speed limit SIGNS before then.
Prior to 1974, Watt Ave south of the American River in Sacramento City was unposted and therefore 65MPH.

I know that I saw portions of 7th Standard Road posted for 65MPH in July 2019. As far as I know, that's a Kern County road.

[kendancy66]

For me:  80 on I-15 in Utah.

I-70 in Utah also has 80 mph

[webny99]

Highest speed limit on a non-state maintained road:  45 mph on the Golden Gate Bridge

Wait, what? Do you mean lowest?

In New York, county roads default to 55 mph. Many of them don't even have speed limit signs; it's just assumed.
I can only imagine that type of thing is more common the further west one travels!

[sprjus4]

Highest speed limit on a non-state maintained road:  45 mph on the Golden Gate Bridge

Wait, what? Do you mean lowest?

In New York, county roads default to 55 mph. Many of them don't even have speed limit signs; it's just assumed.
I can only imagine that type of thing is more common the further west one travels!

-His- highest speed.