According to Wikipedia, it's 40 MPH. But I swear I've seen pictures of lower speed limits on Interstates. What is it?
I'm assuming you intend to exclude places like toll plazas or the approaches to Customs checkpoints at the Canadian and Mexican borders and that instead you mean mainline speed limits.
With that understanding, there's a 35-mph speed limit on I-395 in the District of Columbia. I-395 goes down a ramp to enter the Third Street Tunnel and very briefly narrows to a single lane in that area, but it's still part of the mainline and it's posted at 35 mph.
I believe the northbound lanes of I-70 drop to 35 mph some distance before Breezewood, roughly around the point where you cross the access ramp to/from the Turnpike.
I-264 in Norfolk, VA has a speed limit of 35, but I'm not sure if there are any static signs displaying that, as that stretch has variable speed limits (I've just never seen anything other than 35 displayed).
I can imagine there are plenty of toll booths with lower speeds (like for instance the barrier tolls on I-90 on the MassPike in Boston), and I'm sure there are some tunnels and interchanges with lower speed limits (I'm thinking of I-90 through the South Bay interchange and the Ted Williams Tunnel then through the airport), though I'm having a hard time verifying these on street view.
Then there's also I-95 at the southern 128 interchange, but I can't remember if the curve speed is regulatory or advisory. Knowing MassDOT I would actually think regulatory.
25 MPH (advisory) speed limit for I-75 north transitioning from the Fisher Freeway to the Chrysler Freeway in Detroit:
https://maps.google.com/maps?q=Chrysler+Freeway,+Detroit&hl=en&ll=42.342266,-83.045676&spn=0.004447,0.004265&sll=37.269174,-119.306607&sspn=13.851002,17.468262&t=h&hq=Chrysler+Freeway,&hnear=Detroit,+Wayne,+Michigan&fll=42.342365,-83.0453&fspn=0.004447,0.004265&z=18&layer=c&cbll=42.341914,-83.045669&panoid=WMDMiMES1K6xA4x4WKhuNA&cbp=12,105.55,,1,-8.04
Quote from: deathtopumpkins on October 19, 2012, 12:19:52 PM
I-264 in Norfolk, VA has a speed limit of 35, but I'm not sure if there are any static signs displaying that, as that stretch has variable speed limits (I've just never seen anything other than 35 displayed).
I can imagine there are plenty of toll booths with lower speeds (like for instance the barrier tolls on I-90 on the MassPike in Boston), and I'm sure there are some tunnels and interchanges with lower speed limits (I'm thinking of I-90 through the South Bay interchange and the Ted Williams Tunnel then through the airport), though I'm having a hard time verifying these on street view.
One of the smarter things I've seen in Europe is an END MOTORWAY (http://www.transportstyrelsen.se/Vagmarken/Anvisningsmarken/E2/E2-1/laddahem/E2-1.png) sign as one approaches a mainline toll barrier (GSV example here (https://maps.google.com/maps?q=malmo+sweden&hl=en&ie=UTF8&ll=55.565194,12.901726&spn=0.013565,0.038581&safe=off&hnear=Malm%C3%B6,+Sweden&gl=us&t=h&z=15&layer=c&cbll=55.565205,12.901905&panoid=onKOO_TEI3NjVuomDZlXLw&cbp=12,105.12,,0,1.7) on Route E20 approaching the bridge-tunnel toll plaza in Malmö, Sweden).
The speed limit goes down to 70 k/h and then to 30 k/h and finally to 10 k/h at the toll booths (this barrier does double duty, as traffic headed from Denmark to Sweden is subject to customs enforcement (if you look carefully on GSV, you can see a VACIS truck north of the toll barrier - I suspect Swedish customs officers are looking for (large quantities of) smuggled alcohol, drugs and maybe human beings), as both nations belong to the Schengen agreement, they are presumably not doing immigration checks or stamping passports).
Though I don't the the gamma rays used by VACIS are good for living things.
Quote from: deathtopumpkins on October 19, 2012, 12:19:52 PM
I-264 in Norfolk, VA has a speed limit of 35, but I'm not sure if there are any static signs displaying that, as that stretch has variable speed limits (I've just never seen anything other than 35 displayed).
I can imagine there are plenty of toll booths with lower speeds (like for instance the barrier tolls on I-90 on the MassPike in Boston), and I'm sure there are some tunnels and interchanges with lower speed limits (I'm thinking of I-90 through the South Bay interchange and the Ted Williams Tunnel then through the airport), though I'm having a hard time verifying these on street view.
Then there's also I-95 at the southern 128 interchange, but I can't remember if the curve speed is regulatory or advisory. Knowing MassDOT I would actually think regulatory.
The 25 mph limit on the "Canton Death Curve" from I-95 north to I-95/128 north is advisory, not regulatory. Same goes for the 25 mph limit on the "Attleboro Death Curve" from I-295 north to I-95 north.
Quote from: cpzilliacus on October 19, 2012, 12:38:20 PM
(if you look carefully on GSV, you can see a VACIS truck north of the toll barrier - I suspect Swedish customs officers are looking for (large quantities of) smuggled alcohol, drugs and maybe human beings),
does all traffic get shunted to using the VACIS? I couldn't really tell because there was a break in Google imagery between the toll plaza and the point where you're almost right next to the truck.
when I crossed the bridge, I did not get any customs check in either direction. there also were no human toll operators, as far as I could find. it was 4am one time and 3.30am the other. I was glad my US credit card was accepted without needing a PIN.
I-295 southbound at the I-76/NJ 42 interchange has a posted speed (regulatory speed limit) of 35 shortly before the infamous Al-Jo curve.
What is the speed limit on I-94 through the tunnel at Hennepin Ave in Minneapolis, MN?
Mike
Quote from: agentsteel53 on October 19, 2012, 12:53:23 PM
Quote from: cpzilliacus on October 19, 2012, 12:38:20 PM
(if you look carefully on GSV, you can see a VACIS truck north of the toll barrier - I suspect Swedish customs officers are looking for (large quantities of) smuggled alcohol, drugs and maybe human beings),
does all traffic get shunted to using the VACIS? I couldn't really tell because there was a break in Google imagery between the toll plaza and the point where you're almost right next to the truck.
I don't think so (but I don't know with certainty) - for one thing, if they screened every vehicle with VACIS, they would back up traffic back to Kastrup Airport in Denmark!
My impression is they use VACIS when they already have a suspicion that contraband might be hidden in a vehicle. From what I can tell on Border Wars (airs on the National Geographic Channel), that's how U.S. ICE agents use such units at the U.S./Mexico border and (sometimes) at inland checkpoints.
Quote from: agentsteel53 on October 19, 2012, 12:53:23 PM
when I crossed the bridge, I did not get any customs check in either direction. there also were no human toll operators, as far as I could find. it was 4am one time and 3.30am the other. I was glad my US credit card was accepted without needing a PIN.
My understanding was that they accept cash (Swedish, Danish and Euros) at all times. But maybe not.
I also understand that Danish customs does not check traffic headed from Sweden to Denmark (but they probably reserve the right to).
Quote from: deathtopumpkins on October 19, 2012, 12:19:52 PM
I-264 in Norfolk, VA has a speed limit of 35, but I'm not sure if there are any static signs displaying that, as that stretch has variable speed limits (I've just never seen anything other than 35 displayed).
I've seen a static 35 sign just as you're coming out of the tunnel towards Norfolk (eastbound), where the lanes from I-464 are joining before the Berkley Bridge. I have also seen 25 displayed on the variable speed limit signs (at least westbound, before the bridge), and that may be part of the protocol for stopping traffic for a bridge opening, based on the most recent times I've noticed it at 25.
Quote from: PHLBOS on October 19, 2012, 01:06:00 PM
I-295 southbound at the I-76/NJ 42 interchange has a posted speed (regulatory speed limit) of 35 shortly before the infamous Al-Jo curve.
And Northbound in the same area as well.
Quote from: mgk920 on October 19, 2012, 01:21:32 PM
What is the speed limit on I-94 through the tunnel at Hennepin Ave in Minneapolis, MN?
Mike
35 mph, but that's advisory, not regulatory (my best friend used to live in the Twin Cities, so I recall both the I-94 tunnel and the original I-35W bridge very well).
The I-93 tunnels through Downtown Boston are regulatory 45 mph, but advisory 35 mph on the curves.
I forget the posted limit (45 is memory serves), but the curve on I-90 just west of downtown Cleveland is posted pretty low.
Quote from: TheStranger on October 19, 2012, 12:32:46 PM
25 MPH (advisory) speed limit for I-75 north transitioning from the Fisher Freeway to the Chrysler Freeway in Detroit:
https://maps.google.com/maps?q=Chrysler+Freeway,+Detroit&hl=en&ll=42.342266,-83.045676&spn=0.004447,0.004265&sll=37.269174,-119.306607&sspn=13.851002,17.468262&t=h&hq=Chrysler+Freeway,&hnear=Detroit,+Wayne,+Michigan&fll=42.342365,-83.0453&fspn=0.004447,0.004265&z=18&layer=c&cbll=42.341914,-83.045669&panoid=WMDMiMES1K6xA4x4WKhuNA&cbp=12,105.55,,1,-8.04
Advisories are not limits.
Quote from: roadman on October 19, 2012, 02:05:57 PMThe I-93 tunnels through Downtown Boston are regulatory 45 mph, but advisory 35 mph on the curves.
Its Central Artery predecessor had a posted regulatory 35 mph limit.
Quote from: bugo on October 19, 2012, 11:55:08 AM
According to Wikipedia, it's 40 MPH. But I swear I've seen pictures of lower speed limits on Interstates. What is it?
An enigma.
Interstate 10 eastbound between La 30 (Nicholson/TO LSU) and Washington Street (basically the ramp from the I-10 bridge to 110) has a posted speed limit of 35, and the fastest you can go is 40 MPH.
This one?: https://maps.google.com/maps?q=Baton+Rouge,+LA&hl=en&ll=30.439054,-91.182511&spn=0.009269,0.01929&sll=30.307761,-97.753401&sspn=0.59398,1.234589&oq=Baton&hnear=Baton+Rouge,+East+Baton+Rouge,+Louisiana&t=m&z=16&layer=c&cbll=30.439055,-91.18231&panoid=8mgg-iqkDdx8SgeIgrDQlw&cbp=12,113.29,,0,8.73
Technically this 30 mph is still on I-175:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages175%2Fi-175_fl_et_05.jpg&hash=ea84be193c468c260a55b02c3c9ef28df2946f72)
And this one on I-375 (yeah, it's past the end sign, but those often jump the gun slightly):
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages375%2Fi-375_fl_et_01.jpg&hash=9df1012482b7b31e9522c6a43fd955c35eef5891)
As well as the east end of I-195 FL (this one is definitely before the former end sign, now gone).
25 mph at the east end of I-70:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.interstate-guide.com%2Fimages070%2Fi-070_et_26.jpg&hash=50eababa834da315233b65560faaf6f145d74ca8)
The only others below 35 currently tagged in OSM are at toll booths.
45 MPH - Downtown Loop, Kansas City, MO
Quote from: rarnold on October 20, 2012, 12:08:53 AM
45 MPH - Downtown Loop, Kansas City, MO
[pooing is uncool] → [45<40]
Quote from: bugo on October 19, 2012, 11:55:08 AM
According to Wikipedia, it's 40 MPH. But I swear I've seen pictures of lower speed limits on Interstates. What is it?
Well, here's one of those 40mph's, I-279 @ it's Southern start (http://goo.gl/maps/JCqhy).
Quote from: maplestar on October 19, 2012, 01:45:17 PM
Quote from: deathtopumpkins on October 19, 2012, 12:19:52 PM
I-264 in Norfolk, VA has a speed limit of 35, but I'm not sure if there are any static signs displaying that, as that stretch has variable speed limits (I've just never seen anything other than 35 displayed).
I've seen a static 35 sign just as you're coming out of the tunnel towards Norfolk (eastbound), where the lanes from I-464 are joining before the Berkley Bridge. I have also seen 25 displayed on the variable speed limit signs (at least westbound, before the bridge), and that may be part of the protocol for stopping traffic for a bridge opening, based on the most recent times I've noticed it at 25.
I honestly can't remember the last time I got stopped for a bridge opening at the Berkley (only the JRB and Coleman, but they don't have variable speed limit signs), but yes, reducing the speed to 25 is standard protocol for a Hampton Roads tunnel closure and presumably a bridge closure too.
Another case of technically before the end sign: http://goo.gl/maps/PGKsC I-264 in Virginia Beach. Drops to 45 then 35 between the Birdneck interchange and the first intersection.
Quote from: rickmastfan67 on October 20, 2012, 01:58:01 AM
Quote from: bugo on October 19, 2012, 11:55:08 AM
According to Wikipedia, it's 40 MPH. But I swear I've seen pictures of lower speed limits on Interstates. What is it?
Well, here's one of those 40mph's, I-279 @ it's Southern start (http://goo.gl/maps/JCqhy).
I-490 through downtown Rochester has long been known for its 40mph limit as well, which survived the recent reconstruction:
https://maps.google.com/maps?ll=43.152335,-77.616477&spn=0.009126,0.019205&t=m&z=16&layer=c&cbll=43.152403,-77.61676&panoid=HcKd4B8O7DdeImg9fnnMiw&cbp=12,112.34,,1,2.87
This stretch is notable since it's decidedly not on a ramp (like I-395, even though it carries the number continuity) or at a terminus, nor associated with a bridge, tunnel, or any single specific curve. It's purely a mainline, through-route, fixed regulatory speed limit. It's probably the one Wikipedia has in mind.
Quote from: kphoger on October 19, 2012, 05:40:48 PM
Quote from: bugo on October 19, 2012, 11:55:08 AM
According to Wikipedia, it's 40 MPH. But I swear I've seen pictures of lower speed limits on Interstates. What is it?
An enigma.
To be fair, I can't find where on Wikipedia it says this, unless Bugo is misinterpreting this section (http://en.wikipedia.org/wiki/Interstate_Highway_System#Speed_limits). It says, "In some areas, speed limits on Interstates can be significantly lower in areas where they traverse significantly hazardous areas," then lists a couple of examples, including I-68 in MD at 40 mph, but doesn't actually specify that those examples are the extremes.
The Holland Tunnel has a posted speed limit of 35 mph. That still is part of I-78.
Then the NJ Turnpike sometimes in special conditions has had it posted at 35mph.
Then the I-295 Southbound, that was already posted here, is regulatory and not advisory as it has normal speed limit signs of 35 mph after the I-76 ramp.
Also you do have to count when an interstate enters a ramp inside an interchange. Whether its I-83 at the Eisenhower Interchange in Harrisburg or I-55 navigating through Memphis at Crump Boulevard cloverleaf, it still counts as a mainline.
Quote from: empirestate on October 20, 2012, 04:31:43 PM
Quote from: rickmastfan67 on October 20, 2012, 01:58:01 AM
Quote from: bugo on October 19, 2012, 11:55:08 AM
According to Wikipedia, it's 40 MPH. But I swear I've seen pictures of lower speed limits on Interstates. What is it?
Well, here's one of those 40mph's, I-279 @ it's Southern start (http://goo.gl/maps/JCqhy).
I-490 through downtown Rochester has long been known for its 40mph limit as well, which survived the recent reconstruction:
https://maps.google.com/maps?ll=43.152335,-77.616477&spn=0.009126,0.019205&t=m&z=16&layer=c&cbll=43.152403,-77.61676&panoid=HcKd4B8O7DdeImg9fnnMiw&cbp=12,112.34,,1,2.87
This stretch is notable since it's decidedly not on a ramp (like I-395, even though it carries the number continuity) or at a terminus, nor associated with a bridge, tunnel, or any single specific curve. It's purely a mainline, through-route, fixed regulatory speed limit. It's probably the one Wikipedia has in mind.
The curves on the Inner Loop need the 40mph limit though... I wonder if NYSDOT just decided to make everything 40 rather than some other limit between 40 and 55 (probably 45, since that's what the Inner Loop has) in between.
Quote from: deanej on October 21, 2012, 01:07:31 PM
The curves on the Inner Loop need the 40mph limit though... I wonder if NYSDOT just decided to make everything 40 rather than some other limit between 40 and 55 (probably 45, since that's what the Inner Loop has) in between.
It is because of the curves, actually the ones coming into the loop from the west and (particularly) the east; on the loop itself, I-490 actually traverses the least curvy section of it. (That results in a convenient speed trap location, as motorists are tempted to speed up on the straight, wide section between exits 13 and 15.) I would not be surprised if this speed limit was grandfathered in from the pre-interstate Inner Loop era.
I do think it's worth making a distinction between the lowest speed limit on a mainline segment versus those associated with ramps, tunnels etc. And by mainline, I don't mean the path that the route number follows...a ramp is still a ramp and is a different animal than a regular piece of freeway. The curves on I-490 a right on the mainline, and there's a fair stretch of non-curvy freeway still marked at 40 mph in between, so to me that's more noteworthy than an Interstate that happens to pass through an interchange where one of the ramps has a low posted speed limit.
Before the reconstruction of the infamous "S" curve in Laurel, MS, the speed limit on I-59 was 40mph.
If I recall the Brooklyn Battery Tunnel has either a 25 or 35 mph limit. I'll have to check that later today.
Quote from: Master son on October 23, 2012, 01:19:31 PM
If I recall the Brooklyn Battery Tunnel has either a 25 or 35 mph limit. I'll have to check that later today.
Sorry, you won't be able to. You'll have to settle for checking out the Hugh L. Carey tunnel. :-P
Quote from: Master son on October 23, 2012, 01:19:31 PM
If I recall the Brooklyn Battery Tunnel has either a 25 or 35 mph limit. I'll have to check that later today.
Good call. Lincoln Tunnel is 35 MPH and had been I-495. Holland Tunnel is either 25 or 35 and is still I-78. Pay some more and check that one out too ;)
I've seen a speed limit of 35 on Interstate 26 in the Charleston City Limits. In 2001, it was for the last 4 miles of the Interstate, now it is only for the easternmost mile of it.
http://goo.gl/maps/yiLnd
If I-78 was built as planned to blast through Phillipsburg, NJ, then the horribly tight curve on what is now plain ol' 22 would be a 25 mph speed limit for 78. (In fact, it was 78 once.)
Quote from: empirestate on October 23, 2012, 02:31:59 PM
Quote from: Master son on October 23, 2012, 01:19:31 PM
If I recall the Brooklyn Battery Tunnel has either a 25 or 35 mph limit. I'll have to check that later today.
Sorry, you won't be able to. You'll have to settle for checking out the Hugh L. Carey tunnel. :-P
Still the Brooklyn Battery Tunnel to me. :pan:
Don't worry Steve. I'll be checking those out sometime in the
very near future :sombrero:
Quote from: Master son on October 28, 2012, 11:55:00 AM
Quote from: empirestate on October 23, 2012, 02:31:59 PM
Quote from: Master son on October 23, 2012, 01:19:31 PM
If I recall the Brooklyn Battery Tunnel has either a 25 or 35 mph limit. I'll have to check that later today.
Sorry, you won't be able to. You'll have to settle for checking out the Hugh L. Carey tunnel. :-P
Still the Brooklyn Battery Tunnel to me. :pan:
Don't worry Steve. I'll be checking those out sometime in the very near future :sombrero:
Are you there now? Seek shelter in a subway tunnel.
Quote from: Steve on October 28, 2012, 09:39:31 PM
Quote from: Master son on October 28, 2012, 11:55:00 AM
Quote from: empirestate on October 23, 2012, 02:31:59 PM
Quote from: Master son on October 23, 2012, 01:19:31 PM
If I recall the Brooklyn Battery Tunnel has either a 25 or 35 mph limit. I'll have to check that later today.
Sorry, you won't be able to. You'll have to settle for checking out the Hugh L. Carey tunnel. :-P
Still the Brooklyn Battery Tunnel to me. :pan:
Don't worry Steve. I'll be checking those out sometime in the very near future :sombrero:
Are you there now? Seek shelter in a subway tunnel.
not THAT near - and you were hopin weren't you >-D
http://www.cbsnews.com/video/watch/?id=50134146n
This video that was posted in the Sandy Off-Topic thread clearly shows Speed Limit 25 signs for the Brooklyn Battery Tunnel. :D
I-68 thru Cumberland, Maryland is 40MPH if I remember right. It is needed with no shoulders and a tight turn.
I'd imagine that the speed inside the Brooklyn-Battery Tunnel depends on how fast your boat is these days.
Quote from: tdindy88 on October 30, 2012, 02:18:29 PM
I'd imagine that the speed inside the Brooklyn-Battery Tunnel depends on how fast your boat is these days.
Boat?
Try submarine. The tunnel is flooded up to sea level.
:nod:
Mike
This is technically the interstate where this is posted, but I'm not sure if this should count: http://goo.gl/maps/uQUzs
While it's approaching a toll booth, the Delaware Memorial Bridge (I-295 South) has a posted limit of 20 mph. While that's insanely too low to begin with, about 3/4 mile from the toll plaza, the limit is reduced to 35 mph. About 1/3 of a mile prior to the toll plaza, the limit is then reduced to 20 mph. Even school zones in Delaware don't offer this kind of buffer around their schools (they are signed at 20 mph just in the immediate area of the school, not a 1/3 of a mile prior to the school!!!).
Compare that to the toll plaza one passes on the NJ Turnpike just a few miles prior, where the limit is never reduced approaching the cash lanes of the toll plaza.
I 70 in Breezewood, Pennsylvania IIRC the speed limit drops to 30 mph before using the surface street. Are there any others that comes close? It can't be construction related.
Merged with topic NE2 pointed out - please search to avoid duplicates. It is very rare that construction speed limits are lower than limits such as what you pointed out. -sso
https://www.aaroads.com/forum/index.php?topic=7904
-- EDIT nevermind - merging... --sso
Quote from: robbones on November 23, 2014, 10:37:26 AM
I 70 in Breezewood, Pennsylvania IIRC the speed limit drops to 30 mph before using the surface street. Are there any others that comes close? It can't be construction related.
I-78 in Jersey City, NJ has to be somewhat similar to this, being that it uses surface streets before the Holland Tunnel - however, I can't actually find a single speed limit sign on the stretch.
Quote from: Zeffy on November 23, 2014, 10:44:46 AM
Quote from: robbones on November 23, 2014, 10:37:26 AM
I 70 in Breezewood, Pennsylvania IIRC the speed limit drops to 30 mph before using the surface street. Are there any others that comes close? It can't be construction related.
I-78 in Jersey City, NJ has to be somewhat similar to this, being that it uses surface streets before the Holland Tunnel - however, I can't actually find a single speed limit sign on the stretch.
Most of the time the tacit speed limit is about 15 there anyway.
Aside from Thruway toll plazas (which have a 5 mph speed limit on many E-ZPass lanes), the lowest in NY is I-190 at the Lewiston-Queenston Bridge with a statutory limit of 15 mph.
I believe the tunnel for I-10 in Mobile is signed as 35 MPH, but I haven't been through that in ages.
I-83 in downtown Baltimore is 40 mph. I think the changeover is just north of Guilford Ave.
iPhone
The lowest Speed Limit on a Interstate I saw personally is the Truck Speed Limit of 25 MPH on I-376 (Former I-279) heading towards the Fort Pitt Tunnel towards Downtown Pittsburgh, PA. https://goo.gl/maps/vJ3Pb The sign I linked is just a couple of miles out from the Tunnel as the freeway goes down a steep grade. There's even a runaway truck ramp on this stretch of highway just down the road from this pic.
I 59 in Laurel, Mississippi had a 40 mph at the former S curve. I'm not sure if it's still that slow since they realigned the road.
Are we counting I-180 in Cheyenne?
It's posted at 40 mph.
Quote from: Mark68 on December 03, 2014, 04:11:28 AM
Are we counting I-180 in Cheyenne?
It's posted at 40 mph.
SLD has the
surface portion of I-78 in Jersey City at 25mph.
Quote from: Pete from Boston on December 03, 2014, 08:04:37 AM
Quote from: Mark68 on December 03, 2014, 04:11:28 AM
Are we counting I-180 in Cheyenne?
It's posted at 40 mph.
SLD has the surface portion of I-78 in Jersey City at 25mph.
As if you could ever go that fast on the tunnel approach. You're lucky to do 10 most of the time.
Quote from: cl94 on December 03, 2014, 11:37:43 AM
Quote from: Pete from Boston on December 03, 2014, 08:04:37 AM
Quote from: Mark68 on December 03, 2014, 04:11:28 AM
Are we counting I-180 in Cheyenne?
It's posted at 40 mph.
SLD has the surface portion of I-78 in Jersey City at 25mph.
As if you could ever go that fast on the tunnel approach. You're lucky to do 10 most of the time.
Upthread I said it has a tacit speed limit of 15, but that's at 4 in the morning.
Speed Limit 50. Thats for the Western Terminus for I-80 in San Francisco. This is the slowest Speed Limit for an interstate in California.
Quote from: sawblade5 on November 30, 2014, 09:29:37 AM
The lowest Speed Limit on a Interstate I saw personally is the Truck Speed Limit of 25 MPH on I-376 (Former I-279) heading towards the Fort Pitt Tunnel towards Downtown Pittsburgh, PA. https://goo.gl/maps/vJ3Pb The sign I linked is just a couple of miles out from the Tunnel as the freeway goes down a steep grade. There's even a runaway truck ramp on this stretch of highway just down the road from this pic.
The Truck speed limit on the Mackinac Bridge (I-75 Michigan) is 20. Not sure if that counts, though, as the car speed limit is 45.
Quote from: Special K on October 19, 2012, 03:10:33 PM
Quote from: TheStranger on October 19, 2012, 12:32:46 PM
25 MPH (advisory) speed limit for I-75 north transitioning from the Fisher Freeway to the Chrysler Freeway in Detroit:
https://maps.google.com/maps?q=Chrysler+Freeway,+Detroit&hl=en&ll=42.342266,-83.045676&spn=0.004447,0.004265&sll=37.269174,-119.306607&sspn=13.851002,17.468262&t=h&hq=Chrysler+Freeway,&hnear=Detroit,+Wayne,+Michigan&fll=42.342365,-83.0453&fspn=0.004447,0.004265&z=18&layer=c&cbll=42.341914,-83.045669&panoid=WMDMiMES1K6xA4x4WKhuNA&cbp=12,105.55,,1,-8.04
Advisories are not limits.
My rule of thumb on advisory signs - developed while tearing around the North Georgia mountains in a 1990 Toyota MR2: Double and add 10.
So 60 it is at the Fisher/Chrysler transition in Detroit.
Quote from: Fred Defender on December 04, 2014, 01:23:03 PM
My rule of thumb on advisory signs - developed while tearing around the North Georgia mountains in a 1990 Toyota MR2: Double and add 10.
So 60 it is at the Fisher/Chrysler transition in Detroit.
So I can go 110 on the Atlantic City Expressway at the curve approaching its western terminus?
Sure... 110 kmh.
What about bridges with changable speed limits? I don't know how low the bridges near philly can go, but 35 seems to be normal.
Quote from: SteveG1988 on December 15, 2014, 09:23:25 AM
What about bridges with changable speed limits? I don't know how low the bridges near philly can go, but 35 seems to be normal.
25 mph in severe weather conditions.
Quote from: jeffandnicole on December 15, 2014, 10:26:51 AM
Quote from: SteveG1988 on December 15, 2014, 09:23:25 AM
What about bridges with changable speed limits? I don't know how low the bridges near philly can go, but 35 seems to be normal.
25 mph in severe weather conditions.
In theory these roads can go down to 5mph, so i would say that is the lowest.
Can we count toll plazas? If so, numerous NY interstates have 5 mph speed limits (the speed limit of most Thruway E-ZPass-only lanes) at most toll barriers.
Quote from: bing101 on December 04, 2014, 11:50:30 AM
Speed Limit 50. Thats for the Western Terminus for I-80 in San Francisco. This is the slowest Speed Limit for an interstate in California.
(Truck) Speed Limit 35 on NB I-5 through the Grapevine coming down from Tejon Pass says hi.
But 50 probably is the slowest regular automobile speed limit for a CA Interstate, so I'll concede that.
Quote from: SteveG1988 on December 15, 2014, 04:30:57 PM
Quote from: jeffandnicole on December 15, 2014, 10:26:51 AM
Quote from: SteveG1988 on December 15, 2014, 09:23:25 AM
What about bridges with changable speed limits? I don't know how low the bridges near philly can go, but 35 seems to be normal.
25 mph in severe weather conditions.
In theory these roads can go down to 5mph, so i would say that is the lowest.
In theory, yes. But the actual lowest
posted speed I've seen or heard is 25 mph.