Speed Limit Differences at State Lines of 10 mph or more

[Ingsoc75]

Typically on 2 lane roads that pass from one state to the other at the state line but could be other types of roads as well.

Texas-Louisiana - 70/55 (Maybe 75 on some road in east TX that crosses into LA)

Oregon-Nevada - 55/70

These are two examples that come to mind.

[dgolub]

I'm not sure it's exactly at the state line, but when you cross from the Hutchinson Parkway in New York to the Merritt Parkway (CT 15) in Connecticut, there's a curvy stretch just over the border where the speed limit drops from 55 MPH to 45 MPH for a little while.

[froggie]

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

[jp the roadgeek]

Within 3 miles of the CT/MA border, the speed limit on I-91 N drops from 65 to 45 for the Forest Park curve in Springfield.

[oscar]

IIRC, when I drove it in early 2008, US 62/180 dropped from 75 to 55, crossing from Texas east of El Paso into New Mexico. Now GMSV shows the drop is only down to 70, with the highway changing from two-lane to four-lane divided just after the state line.

[jeffandnicole]

Due to the various agencies that operate the toll bridges crossing the Delaware River which base their speed limits on arbitrary figures rather than actual engineering, one will find speed limit drops as you get close to the border.  Taking the NJ Turnpike south, the limit drops from 65 to 50 mph at the Delaware Memorial Bridge.  I-76 drops from 55 to 45 mph approaching the Walt Whitman Bridge.  On I-676, the limit was 55 mph up to near the toll plaza.  Apparently the DRPA took over a little more jurisdiction of I-676 in NJ, because they posted 45 mph limits on 676 where it had been 55 mph forever.

[1995hoo]

I seem to recall US-15 dropping from 65 in Pennsylvania, where it's a freeway around Gettysburg, to 55 in Maryland.

[WillWeaverRVA]

I seem to recall US-15 dropping from 65 in Pennsylvania, where it's a freeway around Gettysburg, to 55 in Maryland.

That speed limit drop (currently) happens before the state line:

https://www.google.com/maps/@39.7221869,-77.3053872,3a,75y,312.66h,78.57t/data=!3m6!1e1!3m4!1se1-U2YougOEMP3xdPtn01A!2e0!7i13312!8i6656

[ekt8750]

Due to the various agencies that operate the toll bridges crossing the Delaware River which base their speed limits on how much money they can make on speeding tickets rather than actual engineering, one will find speed limit drops as you get close to the border.

FTFY

Taking the NJ Turnpike south, the limit drops from 65 to 50 mph at the Delaware Memorial Bridge.  I-76 drops from 55 to 45 mph approaching the Walt Whitman Bridge.  On I-676, the limit was 55 mph up to near the toll plaza.  Apparently the DRPA took over a little more jurisdiction of I-676 in NJ, because they posted 45 mph limits on 676 where it had been 55 mph forever.

I noticed that as well. I see DRPA cops patrolling 676 north of Kaighn's Av all the time these days.

[vdeane]

I-84 Oregon/Idaho: 65 (soon to be 70)/80

I seem to recall US-15 dropping from 65 in Pennsylvania, where it's a freeway around Gettysburg, to 55 in Maryland.

That speed limit drop (currently) happens before the state line:

https://www.google.com/maps/@39.7221869,-77.3053872,3a,75y,312.66h,78.57t/data=!3m6!1e1!3m4!1se1-U2YougOEMP3xdPtn01A!2e0!7i13312!8i6656

Close enough.  Looks like Pennsylvania is just signing the Maryland limit.

I'm not sure it's exactly at the state line, but when you cross from the Hutchinson Parkway in New York to the Merritt Parkway (CT 15) in Connecticut, there's a curvy stretch just over the border where the speed limit drops from 55 MPH to 45 MPH for a little while.

Looked like 55 to 50 when I was there for the Merritt Parkway meet.

[bzakharin]

Not state line, but county line, on Church Road as you enter Burlington County from Camden County, the speed limit goes up from 25 to 40: https://www.google.com/maps/@39.9316524,-74.9824522,3a,75y,83.7h,69.82t/data=!3m6!1e1!3m4!1speUL2QbZiwtn6ih1ZN_Ykw!2e0!7i13312!8i6656!5m1!1e1!6m1!1e1
Well, probably. That is the first 40 sign going eastbound, but the first 25 sign going westbound is not until after Kings Highway. Curiously, Greentree Road goes the opposite way, 35 to 25 from Camden to Burlington County (https://www.google.com/maps/@39.9059785,-74.9527659,3a,75y,83.66h,81.2t/data=!3m6!1e1!3m4!1ssjQxRfeAVwBU0W2akE-L_g!2e0!7i13312!8i6656!5m1!1e1!6m1!1e1).

[cl94]

US 4 at the NY/VT line has a 10 mph drop/increase within 1/4 mile of the state line. NY/MA 2 has a 15 mph drop at the state line heading EB (25 for trucks).

I don't think this was mentioned yet, but I-95 at the DE/MD line.

[elsmere241]

I don't think this was mentioned yet, but I-95 at the DE/MD line.

Not anymore.  I-95 from the Maryland line to just past the I-495 split is now 65.

[roadman65]

US 19 across the FL/GA State Line goes from 65 mph in Florida to 55 mph in Georgia.

US 1, 23, and 301 do the same at the FL/GA State Line (St. Mary's River) where GA keeps what FL does at 65 at 55.

The US 1 crossing has an excuse because Folkston lies within a few miles of the border which has lower speed limits than 55 anyway.  US 19 has over 10 miles of rural road, which is 65 mph elsewhere on four lane roads like itself usually, before it reaches Thomasville, GA its first city along the way.

[1995hoo]

I seem to recall US-15 dropping from 65 in Pennsylvania, where it's a freeway around Gettysburg, to 55 in Maryland.

That speed limit drop (currently) happens before the state line:

https://www.google.com/maps/@39.7221869,-77.3053872,3a,75y,312.66h,78.57t/data=!3m6!1e1!3m4!1se1-U2YougOEMP3xdPtn01A!2e0!7i13312!8i6656

Close enough.  Looks like Pennsylvania is just signing the Maryland limit.

....

That's how I've always understood it because the northbound limit changes pretty much right after you cross the state line.

[wphiii]

I seem to recall US-15 dropping from 65 in Pennsylvania, where it's a freeway around Gettysburg, to 55 in Maryland.

The inverse happens going from Maryland (65) to PA (55) on I-70. That 55 mph stretch in PA is utterly pointless.

[hbelkins]

Speed limit on US 460 in West Virginia east of Princeton drops from 65 to 45 at the Virginia state line. I actually think the drop was to 35 at one point.

[corco]

It's worth noting that the speed limit on US 95 at the Oregon/ Idaho line is currently 55/65, where one speeds up 10 MPH entering Idaho.

Come this spring, it will be 70/65, so crossing from Oregon into Idaho will actually require slowing down 5 MPH.

[cl94]

-Until the New York section of I-99 opened, US 15 was 55/65 at the NY/PA line, dropping NB. If the drop wasn't right at the line, it was pretty damn close.
-NY/VT 149 is 30/40
-MA/NY 23 is 30/55
-I-70 at the OH/WV line is 65/45, respectively. I don't know if ODOT raised that stretch to 70, so it might be more.

[Ace10]

It's worth noting that the speed limit on US 95 at the Oregon/ Idaho line is currently 55/65, where one speeds up 10 MPH entering Idaho.

Come this spring, it will be 70/65, so crossing from Oregon into Idaho will actually require slowing down 5 MPH.

I don't think I saw this mentioned above, but I-84's speed limit also changes at the OR/ID state line, from 80 mph in Idaho to 65 mph in Oregon, a 15 mph difference. It's a very lurching slowdown. As corco mentioned above time-wise, Oregon should be raising I-84's speed limit to 70 mph east of The Dalles, which I believe takes effect on 1 March 2016. If ODOT had its way I bet they'd want to keep the easternmost few miles inside Ontario set at 65 (due to the couple exits within a mile or two of each other) but the law might preclude them from setting a limit lower than 70 there.

[thenetwork]

From a vague memory, US-491 South goes from 65 MPH in Colorado to either 50 or 55 at the border with New Mexico. 

The strangest part of it all is that when you cross into New Mexico, despite no lane additions or drops, the NM side of the border is more barren than the CO side, and yet that is where the slower speed resides.

[lordsutch]

I-20 drops from 70 mph to 55 mph westbound at the AL/GA state line, because the concrete pavement on the AL section was falling apart and rather than fix it short-term they thought lowering the speed limit would make the next time a chunk flew up off the road into a car's windshield non-lethal.

Now it's a construction zone technically, although in ALDOT's typical fashion it's completely half-assed with a lengthy portion that's been widened to six lanes but blocked off to traffic for no apparent reason (and the 55 mph work zone limit still in force, naturally).

[cl94]

I-20 drops from 70 mph to 55 mph westbound at the AL/GA state line, because the concrete pavement on the AL section was falling apart and rather than fix it short-term they thought lowering the speed limit would make the next time a chunk flew up off the road into a car's windshield non-lethal.

Now it's a construction zone technically, although in ALDOT's typical fashion it's completely half-assed with a lengthy portion that's been widened to six lanes but blocked off to traffic for no apparent reason (and the 55 mph work zone limit still in force, naturally).

They must have had someone transfer from PennDOT. The long-running joke about them is that they store their cones/barrels on the road.

[Ingsoc75]

I-20 drops from 70 mph to 55 mph westbound at the AL/GA state line, because the concrete pavement on the AL section was falling apart and rather than fix it short-term they thought lowering the speed limit would make the next time a chunk flew up off the road into a car's windshield non-lethal.

Now it's a construction zone technically, although in ALDOT's typical fashion it's completely half-assed with a lengthy portion that's been widened to six lanes but blocked off to traffic for no apparent reason (and the 55 mph work zone limit still in force, naturally).

They must have had someone transfer from PennDOT. The long-running joke about them is that they store their cones/barrels on the road.

I live in Huntsville and once took I-20 as part of a drive to Atlanta. I saw that 55 mph limit and was like WTF. ALDOT (or ALDONT as many call it) has to be one of the worst DOT in the nation.

[74/171FAN]

I seem to recall US-15 dropping from 65 in Pennsylvania, where it's a freeway around Gettysburg, to 55 in Maryland.

The inverse happens going from Maryland (65) to PA (55) on I-70. That 55 mph stretch in PA is utterly pointless.

Last time I drove that part of I-70 it seemed very substandard all they way up to Breezewood.  I can at least understand why it is still only 55.

Speed limit on US 460 in West Virginia east of Princeton drops from 65 to 45 at the Virginia state line. I actually think the drop was to 35 at one point.

Last I saw (March 2014), it had changed from 65 to 50(looking at Street View it had changed before 2009).  The US 460 Blacksburg/Christiansburg Bypass also now ends eastbound with a 65 to 50 to 35 drop.