Speed Limit Differences at State Lines of 10 mph or more

[peterj920]

I have not field-checked these, but given the statewide default differences between the Dakotas (65 MPH) and Minnesota (generally 55 MPH), there could theoretically be 10 mph differences at these outside-an-adjacent-town locations:

- MN 269/SD 11
- MN 30/SD 34
- US 14
- MN 19/SD 30
- MN 271/SD 28
- MN 68/SD 22
- US 212
- MN 40/SD 20
- MN 55/ND 11
- MN 200/ND 200
- MN 317/ND 17
- MN 11/ND 66
- MN 175/ND 5

Minnesota is raising the Speed Limit on many 2 lane roads to 60.  US 212 is one of them, and streetview confirms that the speed limit is 60 when crossing from South Dakota to Minnesota.  Over a 5 year period, MNDOT will be studying all roads that have a 55 mph speed limit to see if they should be raised to 60, and the study started in 2014.  I personally drove MN 7 across the state a few years ago and it was signed at 60.

[peterj920]

KS 171 to MO 171 drops from 65 to 55 when crossing into Missouri. 

[TheHighwayMan3561]

I-90 going between Minnesota and South Dakota is changing between 70 and 80 MPH.

[Revive 755]

* Although it appears to be a bit south of the state line, I-74 goes from 65 in Illinois to 50 in Iowa Streetview

* I-72 used to go from 65 in Illinois to 55 in Missouri:  Streetview.  Since Illinois raised rural interstates to 70, it may now be a 70 to 55.

[doorknob60]

I-90 drops from 75 to 55 moving from Montana to Idaho (unless this has changed somewhat recently), a 20 MPH difference. Yes both states have a maximum of 80, but Idaho is much more "gung-ho" about lowering the limits from the maximum than Montana is.

[vtk]

Entirely due to different states' speed limit laws:

US 30 IN/OH (60/70 MPH)
I suspect the same on US 24, but I have not personally observed it.

Urban/rural:

US 23 and I-75 are both 70 MPH in extreme southern Michigan, certainly lower across the border in Ohio, though I can't remember if it's 55 or 60 or 65 MPH just inside the Toledo metro area.

[Ingsoc75]

US 190 at the Texas/Louisiana state line there is a 20 mph speed difference.

75 mph on TX side

55 mph on LA side

[cl94]

Entirely due to different states' speed limit laws:

US 30 IN/OH (60/70 MPH)
I suspect the same on US 24, but I have not personally observed it.

Urban/rural:

US 23 and I-75 are both 70 MPH in extreme southern Michigan, certainly lower across the border in Ohio, though I can't remember if it's 55 or 60 or 65 MPH just inside the Toledo metro area.

US 23 is 65 in Ohio. I checked that one yesterday because it immediately came to mind.

[corco]

I-90 drops from 75 to 55 moving from Montana to Idaho (unless this has changed somewhat recently), a 20 MPH difference. Yes both states have a maximum of 80, but Idaho is much more "gung-ho" about lowering the limits from the maximum than Montana is.

Yep, and to add to that, US-12 goes from 70 to 50 crossing from Montana into Idaho.

[vdeane]

I-81 (NY)/ON 137: 65 mph to 50 kph, with a brief NB 40 mph zone for customs.

[1995hoo]

Maryland to DC on Pennsylvania Avenue, speed limit drops from 45 mph to 30 mph. It's not an unreasonable drop due to the road narrowing combined with parallel parking, but DC gives drivers the finger by putting a speed camera within a block or two of the line.

[Duke87]

NY/CT is good for these.

NY 433 has a speed limit of 45. Upon entering Connecticut (and becoming locally maintained) it drops to 35. Which is damn exceptional because you will rarely see a town maintained road in Connecticut posted higher than 30.

The speed limit on NY 35 approaching the CT state line is 55. Once you enter Connecticut, the limit drops to 40. Half a mile later, it drops to 30. Granted, the road on the Connecticut side is curvier than the road on the New York side and does legitimately justify a lower speed limit, but it doesn't need to be rapidly ratcheted all the way down to 30 except because Connecticut.

NY 116 is 45, CT 116 is 35.

NY 343 is 55, CT 343 is 40.

Inversely, CT 123 is posted at 45 but drops to 35 upon entering NY.

[Buck87]

Entirely due to different states' speed limit laws:

US 30 IN/OH (60/70 MPH)

Huh, I was expecting to find that this was wrong, but I now see that they bumped the western section of US 30 to 70 mph back in June (http://limaohio.com/news/6069/speed-limit-on-u-s-30-bumped-to-70-mph). When they first made the jump to 70 for non interstate freeways in October of 2013, the only part of US 30 west of I-71 that qualified was the section from Mansfield to Bucyrus....so I'm pretty damn surprised that they have now decided to make it 70 on sections that still have at grade intersections. So now US 30 is 70 mph from the Indiana line all the way to the edge of Mansfield, with the exception of the multiplex with US 23 around Upper Sandusky.

US 23 and I-75 are both 70 MPH in extreme southern Michigan, certainly lower across the border in Ohio, though I can't remember if it's 55 or 60 or 65 MPH just inside the Toledo metro area.

according to GSV it's 65 right at the border on I-75, and as cl94 pointed out the same is true for US 23.

[cl94]

Entirely due to different states' speed limit laws:

US 30 IN/OH (60/70 MPH)

Huh, I was expecting to find that this was wrong, but I now see that they bumped the western section of US 30 to 70 mph back in June (http://limaohio.com/news/6069/speed-limit-on-u-s-30-bumped-to-70-mph). When they first made the jump to 70 for non interstate freeways in October of 2013, the only part of US 30 west of I-71 that qualified was the section from Mansfield to Bucyrus....so I'm pretty damn surprised that they have now decided to make it 70 on sections that still have at grade intersections. So now US 30 is 70 mph from the Indiana line all the way to the edge of Mansfield, with the exception of the multiplex with US 23 around Upper Sandusky.

IINM, SR 11 has been 70 north of Youngstown since the beginning and it has an at-grade at the rest area.

[noelbotevera]

Redoing my post, I-78 EB goes from 65, then suddenly becomes 55 after entering NJ. WB goes from 55 until MP 1, and then for the last mile I-78 WB is briefly 65 before being reduced to a speed limit of 5 because of the toll after the bridge. I may be wrong though.

[jeffandnicole]

Redoing my post, I-78 EB goes from 65, then suddenly becomes 55 after entering NJ. WB goes from 55 until MP 1, and then for the last mile I-78 WB is briefly 65 before being reduced to a speed limit of 5 because of the toll after the bridge. I may be wrong though.

I-78 is normally 65 right thru the state line between PA & NJ, although construction had the limit temporarily down to 50 in NJ.  At the toll plaza, the express EZ Pass should be supporting 65 thru the lanes.  Amazingly, GSV hasn't been updated since 2008 near the toll plaza.

[kphoger]

Carretera Federal 85, between the states of Tamaulipas and Nuevo León:  100 km/h versus 80 km/h, for an equivalent difference of approximately 12.4 mph.  I don't remember, offhand, which state has which limit.

[lordsutch]

Forgot an obvious one: US 78 drops from 70 mph to 55 mph at the Tennessee state line, although that's more due to the change in access control from "full" to "barely any" a few hundred feet into Tennessee.

[cl94]

NY/CT is good for these.

NY 433 has a speed limit of 45. Upon entering Connecticut (and becoming locally maintained) it drops to 35. Which is damn exceptional because you will rarely see a town maintained road in Connecticut posted higher than 30.

The speed limit on NY 35 approaching the CT state line is 55. Once you enter Connecticut, the limit drops to 40. Half a mile later, it drops to 30. Granted, the road on the Connecticut side is curvier than the road on the New York side and does legitimately justify a lower speed limit, but it doesn't need to be rapidly ratcheted all the way down to 30 except because Connecticut.

NY 116 is 45, CT 116 is 35.

NY 343 is 55, CT 343 is 40.

Inversely, CT 123 is posted at 45 but drops to 35 upon entering NY.

For all of New York's insanely low limits in urban areas, a speed limit under 55 is typically reserved for developed areas. A winding road on a mountain will often be 55. Almost every state line crossing out of New York on a local road in terrain that isn't relatively flat has a drop of at least 5 mph. I'll add NY 26/PA 267 and NY 79/PA 92 near Binghamton (55/45)

As for dropping when one enters New York, there are very few. There's CT 123, VT 149, PA 191 in Hancock (30/45), and the two tunnels into Manhattan.

[capt.ron]

US 59 where it straddles Texas and Arkansas north of Texarkana. Southbound 59 has a 75 mph limit since its on the Texas side and 65 mph on the northbound lanes due to it being in Arkansas.
Southbound  US 59 / 71 immediately crossing the red river
https://www.google.com/maps/@33.5491842,-94.0436348,3a,75y,192.19h,97.56t/data=!3m6!1e1!3m4!1sCQR7A9JxyMdlPH2NqpHBXg!2e0!7i13312!8i6656
Northbound 59/71, just south of the river bridge
https://www.google.com/maps/@33.542464,-94.0430557,3a,75y,29.74h,75.95t/data=!3m6!1e1!3m4!1sjTfuo44Mp8mx_YWR6Wk2_A!2e0!7i13312!8i6656

[hbelkins]

Is there anywhere else where two sides of the same road have a different speed limit? I remember once upon a time this was the case on I-79 between the WV line and I-70, due to a mine subsidence problem, but not sure if it's the case or not.

[cl94]

Is there anywhere else where two sides of the same road have a different speed limit? I remember once upon a time this was the case on I-79 between the WV line and I-70, due to a mine subsidence problem, but not sure if it's the case or not.

How long of a distance are we talking about? New York typically drops limits to 55 before the end of an expressway in the direction approaching the end for a mile or so.

[The Nature Boy]

Is there anywhere else where two sides of the same road have a different speed limit? I remember once upon a time this was the case on I-79 between the WV line and I-70, due to a mine subsidence problem, but not sure if it's the case or not.

How long of a distance are we talking about? New York typically drops limits to 55 before the end of an expressway in the direction approaching the end for a mile or so.

I-89 in Bow, NH is an answer along the same vein. The speed limit drops at the end as it comes to I-93 (where it goes past to actually end at a traffic light)

[1995hoo]

Is there anywhere else where two sides of the same road have a different speed limit? I remember once upon a time this was the case on I-79 between the WV line and I-70, due to a mine subsidence problem, but not sure if it's the case or not.

I-65 immediately north of Montgomery had that. Northbound was 70 mph after you crossed the river and southbound was 60 or 65 in the same area (don't remember which). Don't know if it's still like that. The reason had to do with southbound traffic entering an area with multiple interchanges in a short stretch.

[thenetwork]

Is there anywhere else where two sides of the same road have a different speed limit? I remember once upon a time this was the case on I-79 between the WV line and I-70, due to a mine subsidence problem, but not sure if it's the case or not.

Not a numbered highway, but there was a 2-lane road in Northeast Ohio that straddled two municipalities (West 130th St. north of SR-303). Northbound/Hinckley Township was 45 MPH, Southbound/Brunswick City was 35 MPH.  Not sure if they ever settled on a uniform speed limit, but these dual-limits were in place for many many years as late as the early 00s.

Which begs the question:  If you were passing someone going the speed limit entering into the other municipality, would you be passing at the other's legal speed limit or "speeding" in the other municipality, depending on the direction you are going?