As I was traveling down McCarty Road in Saginaw Township I realized that the speed limit is 45 all the way from North Michigan Road to Midland Road and wondered how many other roads could fit this bill. This road is 7 miles long and is two lanes for its entire length as well.
Around here
I-494 (42 miles) and I-694 (31): 60 MPH
I-535 (2 miles): 55 MPH - the 30 zone doesn't begin until after the south end
I believe all three I-405s fit this criteria. California 65 mph for 72 miles, Oregon 50 mph for 4 miles, and Washington 60 mph for 30 miles.
I-86 in Idaho with 80 mph for 63 miles would be another.
I-291 and I-691 in CT both are 65 MPH their entire length (except for the very end of each). I-291 and I-391 in MA are 55 MPH the entire length.
I-395 in CT and MA is 65 MPH the entire length (and the 65 MPH speed limit continues on I-290 to the Worcester city line)
I-684 in NY and CT is 65 MPH the entire length (except for the portion near I-84 and the two southern legs).
Except for the portion through downtown Middletown, CT 9 is 65 MPH the entire length.
AK 11 (Dalton Highway) is nominally posted for 50 mph for its entire 416-mile length:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.alaskaroads.com%2Fdalton-50mph.jpg&hash=9cba182d6443dc7658564288575ec0878f75a4e7)
However, there are some places you might want to slow down, like the narrow bridge over the Yukon River, or the switchbacks in the Atigun Pass area.
It doesn't quite count, but I was surprised to find out that I-75 in Florida has speed limit 70 for its entire 470-mile length. The speed limit drops in other states, though.
I-474 and I-155 have a speed limit of 70 for their entire length. To find other examples in the Midwest, you'd just have to find a 2-lane road that begins and ends in the middle of nowhere and doesn't pass through any towns. The chances are pretty good that it'll have a 55-mph speed limit the whole way.
By "Road", do you mean a route or a continuous road? Many lettered highways in Missouri have the same speed limit (55) throughout their lengths unless it enters some sort of city limits.
There are quite a few rural FM/RM roads in Texas that begin and end at a highway or at a gravel road and pass through no towns, so they have high speed limits the whole way. Here's a sample:
RM 2886 43 miles 70
RM 2083 36 miles 75
FM 2129 23 miles 75
RM 1312 13 miles 75
RM 2398 15 miles 75
FM 3078 15 miles 75
RM 652 59 miles 75
FM 1450 44 miles 75
FM 1233 34 miles 75
RM 2034 28 miles 75
Quote from: pdx-wanderer on September 09, 2019, 04:24:54 PM
I-86 in Idaho with 80 mph for 63 miles would be another.
I'm 98% sure it drops to 65 mph as it enters Pocatello.
In Virginia...
One speed, no exceptions -
I-664 is consistently posted at 60 mph.
I-564 is consistently posted at 55 mph.
VA-168 Chesapeake Expressway is consistently posted at 55 mph. (not counting the toll plaza area)
I-195 is consistently posted at 55 mph.
VA-195 is consistently posted at 55 mph. (not counting the toll plaza area)
VA-288 is consistently posted at 65 mph.
I-581 is consistently posted at 55 mph.
I-381 is consistently posted at 55 mph.
Mostly one speed, though one exception -
I-464 is consistently posted at 60 mph - with the exception it lowers to 45 mph on the northern end approaching the Downtown Tunnel / Berkley Bridge Complex.
I-264 is consistently posted at 55 mph - with the exception it lowers to 35 mph in the middle through the Downtown Tunnel / Berkley Bridge Complex.
VA-895 is consistently posted at 65 mph - with the exception it lowers to 60 mph on the western end approaching I-95. (not counting the toll plaza area)
I-295 is consistently posted at 70 mph - with the exception it lowers to 65 mph in the middle through the I-95 interchange complex.
I-85 is consistently posted at 70 mph throughout Virginia - with the exception it lowers to 65 mph and 60 mph approaching its northern end.
VA-76 Powhite Pkwy is consistently posted at 60 mph - with the exception it lowers to 55 mph approaching its northern end. (not counting the toll plaza area)
^^^^
To the second category, I'd add that I-495's general-purpose lanes are posted at 55 mph all the way through Virginia (and Maryland too), but the HO/T lanes are posted at 65 for their whole length.
Quote from: 1995hoo on September 09, 2019, 06:57:41 PM
^^^^
To the second category, I'd add that I-495's general-purpose lanes are posted at 55 mph all the way through Virginia (and Maryland too), but the HO/T lanes are posted at 65 for their whole length.
Also, isn't the "Dulles Toll Road" portion of VA-267 posted consistently at 55 mph? I know the "Dulles Greenway" portion is 65 mph, but none on the "Dulles Toll Road" IIRC.
All of I-97 is consistently posted at 65 mph :)
(which is surprising, especially around the Glen Burnie area where, using every other freeway in the area as an example, should be 55 mph)
Quote from: 1995hoo on September 09, 2019, 06:57:41 PM
^^^^
To the second category, I'd add that I-495's general-purpose lanes are posted at 55 mph all the way through Virginia (and Maryland too), but the HO/T lanes are posted at 65 for their whole length.
Heh. I-495 keeps the same speed limit through DC, too! :D
Quote from: Rothman on September 09, 2019, 07:14:07 PM
Quote from: 1995hoo on September 09, 2019, 06:57:41 PM
^^^^
To the second category, I'd add that I-495's general-purpose lanes are posted at 55 mph all the way through Virginia (and Maryland too), but the HO/T lanes are posted at 65 for their whole length.
Heh. I-495 keeps the same speed limit through DC, too! :D
Which is funny because anytime I've driven I-495, especially the I-95 section in Maryland, everyone is doing at least 75 mph, if not 80+ mph. And it's not out-of-state drivers... it's all Maryland plates. It also comes with some reckless driving, weaving all over the 4-lanes, cutting people off, tailgating, and other usual Maryland driver traits.
55 mph is absurdly slow IMO, should be 65 mph minimum.
I-795 in North Carolina is 70mph.
Quote from: sprjus4 on September 09, 2019, 07:16:09 PM
Quote from: Rothman on September 09, 2019, 07:14:07 PM
Quote from: 1995hoo on September 09, 2019, 06:57:41 PM
^^^^
To the second category, I'd add that I-495's general-purpose lanes are posted at 55 mph all the way through Virginia (and Maryland too), but the HO/T lanes are posted at 65 for their whole length.
Heh. I-495 keeps the same speed limit through DC, too! :D
Which is funny because anytime I've driven I-495, especially the I-95 section in Maryland, everyone is doing at least 75 mph, if not 80+ mph. And it's not out-of-state drivers... it's all Maryland plates. It also comes with some reckless driving, weaving all over the 4-lanes, cutting people off, tailgating, and other usual Maryland driver traits.
55 mph is absurdly slow IMO, should be 65 mph minimum.
I usually set my cruise control at 65 everywhere on the Beltway's general-purpose lanes, except in the work zone near Andrews AFB (slower there to hedge against speedometer error in a speed camera zone). I am always neither the slowest person nor the fastest person, so I figure that's a good speed to choose.
Bay Area and California:
- I-40 in California has a limit of 70 MPH throughout the freeway, so does I-505.
- At more than 57 miles, I believe I-280 would be the longest urban route in the Bay Area for this, it is always 65 MPH from San Jose to San Francisco. I believe there are no speed limit signs a couple miles within the north end, the first one I seen going south is after US-101 junction where the freeway becomes 8 lanes.
- Nowadays I clinch I-380 every weekday in my commute but I have yet to see any speed limit sign on this short interstate stretch, I assume it is also 65 MPH
- CA 85 is always 65 MPH. I haven't driven on it north of CA 237 so it could differ there.
- CA 153, signed as "California's shortest state highway" for about half a mile, has a speed limit of 25 MPH.
Is I-195 in NJ all 65 mph?
In FL all of SR 62 is 60 mph from US 17 to US 301.
Quote from: roadman65 on September 09, 2019, 11:50:19 PMIs I-195 in NJ all 65 mph?
The westernmost mile-and-a-half (https://www.google.com/maps/@40.1857945,-74.7008971,3a,75y,277.75h,72.12t/data=!3m6!1e1!3m4!1sdB005bdeXbSHkl_9FDa0XA!2e0!7i13312!8i6656) drops down to 55.
Quote from: pianocello on September 09, 2019, 06:12:13 PM
It doesn't quite count, but I was surprised to find out that I-75 in Florida has speed limit 70 for its entire 470-mile length. The speed limit drops in other states, though.
I-474 and I-155 have a speed limit of 70 for their entire length. To find other examples in the Midwest, you'd just have to find a 2-lane road that begins and ends in the middle of nowhere and doesn't pass through any towns. The chances are pretty good that it'll have a 55-mph speed limit the whole way.
Ha. We all know no one goes 70 in I-75 in Florida though - every time I go down there the minimum speed is 85 on I-75, and its almost exactly when you cross into Florida when it starts to be that way.
Quote from: Techknow on September 09, 2019, 09:15:07 PM
Bay Area and California:
- I-40 in California has a limit of 70 MPH throughout the freeway, so does I-505.
Doesn't Westbound I-40 have an Agricultural Inspection Station which includes advisories eventually down to zero?
I-505, however, is pretty pure.
- At more than 57 miles, I believe I-280 would be the longest urban route in the Bay Area for this, it is always 65 MPH from San Jose to San Francisco. I believe there are no speed limit signs a couple miles within the north end, the first one I seen going south is after US-101 junction where the freeway becomes 8 lanes.
- Nowadays I clinch I-380 every weekday in my commute but I have yet to see any speed limit sign on this short interstate stretch, I assume it is also 65 MPH
- CA 85 is always 65 MPH. I haven't driven on it north of CA 237 so it could differ there.
There are some advisories on the merge on to US-101, but nothing posted as regulatory (and you may want to argue that CASR-85 ends before the advisories).
- CA 153, signed as "California's shortest state highway" for about half a mile, has a speed limit of 25 MPH.
In Michigan:
I-275 - 70 mph
I-475 - 70 mph
I-496 - 70 mph
M-6 - 70 mph
M-102 - 45 mph
M-231 - 65 mph
I wonder if one side of an interstate highway counts. The clockwise traveling segment of Interstate 465 in Indianapolis is 55 MPH the entire way. The counterclockwise lanes of the interstate are 55 MPH with the exception of the northwest corner where the interchange with I-865 forces the speed limit to go down to 45 before resuming 55 on the other side, traveling WB to SB. As far as I remember the clockwise section of the beltway (NB to EB) doesn't have to lower its speed rounding that corner.
Of course no one respects that speed limit.
Quote from: Techknow on September 09, 2019, 09:15:07 PM
Bay Area and California:
- I-40 in California has a limit of 70 MPH throughout the freeway, so does I-505.
- At more than 57 miles, I believe I-280 would be the longest urban route in the Bay Area for this, it is always 65 MPH from San Jose to San Francisco. I believe there are no speed limit signs a couple miles within the north end, the first one I seen going south is after US-101 junction where the freeway becomes 8 lanes.
- Nowadays I clinch I-380 every weekday in my commute but I have yet to see any speed limit sign on this short interstate stretch, I assume it is also 65 MPH
- CA 85 is always 65 MPH. I haven't driven on it north of CA 237 so it could differ there.
- CA 153, signed as "California's shortest state highway" for about half a mile, has a speed limit of 25 MPH.
I-505 has 70mph for the entire route and I-780 65mph for the entire route.
Under normal conditions, I-270 OH is 65 MPH for its entire length.
In New York...
- I-290, 587, 590, 787, 790, 890 are all 55 for their entire length
- I-695 and 878 are 50 for their entire length
- NY 198 and 470 are entirely 30 MPH
- NY 236 and 278 are entirely 45 MPH
- NY 135 and 421 are entirely 55 MPH
Some though I cannot remember if they drop at one or both of the ends:
Illinois
* I-172 (70 mph)?
* IL 255 (65 mph)
Indiana
* I-465 (55 mph)? (Is just an advisory speed posted or is there an actual drop at the I-865 interchange?
Kentucky
* I-264 (55 mph)?
Missouri
* MO 370 (60 mph)?
Quote from: cl94 on September 12, 2019, 10:46:41 PM
Under normal conditions, I-270 OH is 65 MPH for its entire length.
In New York...
- I-290, 587, 590, 787, 790, 890 are all 55 for their entire length
- I-695 and 878 are 50 for their entire length
- NY 198 and 470 are entirely 30 MPH
- NY 236 and 278 are entirely 45 MPH
- NY 135 and 421 are entirely 55 MPH
I-481, NY's part of I-99, and the currently designated portions of eastern I-86 are all 65 their entire length.
I-790 is 65 where it runs parallel to I-90, so it doesn't count for this thread.
NY 840 is 55 its entire length.
NY 531 is close, but I don't think it counts. And what about NY 400?
There are not many examples of any significant length in NY (excluding I-86, which is hopefully a short- or at least only medium-term example). Many of PA's urban/suburban freeways would probably qualify, though, as they're guaranteed not to exceed 55 mph: I-279(?), I-283, PA 283, PA 581. PA 33 notably switches from 55 to 65 halfway through, while I-380 may now be 70 mph for it's entire length (?).
Interstate 184 is 60 MPH its entire length, though the roadway drops to 45 after it transitions to US 20/26
Quote from: webny99 on September 13, 2019, 12:58:30 PM
NY 531 is close, but I don't think it counts. And what about NY 400?
NY 531 drops to 55 at either end. NY 400 also drops to 55 for a mile at its northern end, and drops to 55 and then 40 southbound approaching its southern end.
Quote
There are not many examples of any significant length in NY (excluding I-86, which is hopefully a short- or at least only medium-term example). Many of PA's urban/suburban freeways would probably qualify, though, as they're guaranteed not to exceed 55 mph: I-279(?), I-283, PA 283, PA 581. PA 33 notably switches from 55 to 65 halfway through, while I-380 may now be 70 mph for it's entire length (?).
Note that I-380 has an (IMO pointless) overlap with I-84 that is posted at 55. Even on the portion that doesn't have an overlap, it drops to 55 approaching I-84.
Quote from: sprjus4 on September 09, 2019, 07:02:21 PM
Quote from: 1995hoo on September 09, 2019, 06:57:41 PM
^^^^
To the second category, I'd add that I-495's general-purpose lanes are posted at 55 mph all the way through Virginia (and Maryland too), but the HO/T lanes are posted at 65 for their whole length.
Also, isn't the "Dulles Toll Road" portion of VA-267 posted consistently at 55 mph? I know the "Dulles Greenway" portion is 65 mph, but none on the "Dulles Toll Road" IIRC.
The Toll Road's speed limit drops to 35 mph in advance of the main toll plaza in both directions. I don't know whether that would disqualify it for purposes of this thread. As a more general matter, I kind of assumed the OP probably wouldn't count the road because I assumed VA-267 as a whole would be what would count, even though most of us in Northern Virginia distinguish between the two portions as if they're separate roads. Or even really three portions, for that matter–those of us who have lived here long enough sometimes view the portion east of Route 123 as being separate from the rest. When it opened in 1985, it was usually called the Dulles Access Road Extension. The traffic reporters nowadays tend to call it the "Dulles Connector Road." I know plenty of newer area residents consider that segment part of the "Dulles Toll Road," but that's inaccurate because there's no toll to use it (apart from any I-66 HO/T toll one might have to pay going to or from the road). I know the Toll Road opened before the Access Road Extension, but I don't know which one was planned first (forum member "Beltway" probably knows).
I do remember when I-66 inside the Beltway opened right before Christmas in 1982, the Washington Post had an article about how when the then-planned Exit 20 (as it was then numbered) opened, the "Dulles Access Road Extension" combined with I-66's HOV exemption for Dulles traffic would present a "bonanza" for the "Dulles Access Highway Outlaws," those being the people who illegally drove to the airport and turned around in an effort to beat the traffic. (Bear in mind that when I-66 opened, the restriction was HOV-4, so there was almost nobody on the road during rush hour.)
It's easy for an interstate I think. The road I used in the OP is a more local I believe it would fall under a county road but we don't have county roads in this part of Michigan.
I-86 in Idaho with 80 mph for 63 miles would be another.
[/quote]
The speed limit on I-86 drops to 65 through the Pocatello metro area.
I wanted to say the Taconic State Parkway is 55 its whole length (even in Westchester, ugh) but it does drop to 50 at the Saw Mill and becomes a surface road.
The Sprain and Palisades are 55 the whole way. The FDR Drive is 40. The Cross Island and Belt are 50. Most of the LI parkways are 55 the whole way (the Southern State drops to 50 at the Cross Island).
Putnam County: NY 403 is short, 45 the whole way.
Westchester: NY 132, 40 the whole way.
I-640, going around Knoxville, 55mph
I-459, going around B'ham, 70mph
CA 266 is 65mph from Nevada to Nevada.
Quote from: ftballfan on September 12, 2019, 10:10:24 AM
In Michigan:
I-275 - 70 mph
I-475 - 70 mph
I-496 - 70 mph
M-6 - 70 mph
M-102 - 45 mph
M-231 - 65 mph
More in Michigan:
M-186 - 55 mph
Former M-110 - 45 mph (you can still tell where M-110 ended as the speed limit drops to 35 mph going northbound)
M-157 - 55 mph
M-217 - 55 mph