Longest A to B within a state

[TCN7JM]

Speaking solely in terms of unedited routes between populated places (which is what I assume we're doing), the longest I could come up with in South Dakota distance-wise was 562 miles from Dakota Dunes in the jut near Sioux City to Camp Crook near the northwestern corner of the state (link). Time-wise, this route from Ardmore in the southwest to White Rock in the northeast seems to be the longest, at 8 hours and 39 minutes.

For North Dakota, the longest in terms of both distance and time is from Marmarth in the southwest to Pembina at the Canadian border in the east. It is 545 miles long and takes 7 hours and 39 minutes thanks to the inconvenient northwest-to-southeast direction of US 12 through the southwestern corner of the state (link).

[txstateends]

One thing to consider is that texas is really tall too. typing in texline tx to brownsville tx on the google gives me a distance of 899 miles

Is not US 83 almost 900 miles?

According to my not-so-quick Google Maps figuring, it is 894 miles (14 hours, 49 minutes).

[citrus]

Here's 1 hour 34 min for Rhode Island, staying within state borders.
https://www.google.com/maps/preview#!data=!4m18!3m17!1m5!1sSakonnet+Point+Club%2C+11+Bluff+Head+Ave%2C+Little+Compton%2C+RI+02837!2s0x89e5a8033ab79505%3A0x87af0bde844cfe98!3m2!3d41.464709!4d-71.195867!1m1!1swatch+hill!3m8!1m3!1d366045!2d-71.7105106!3d41.7641415!3m2!1i1280!2i738!4f13.1&fid=0

[hbelkins]

I dropped a pin in far southwestern Kentucky, near the Tennessee state line and the Mississippi River (but not in Kentucky Bend to keep the route all in the state) and I dropped another pin at the easternmost route I could find in Pike County near the Virginia state line.

Results here: http://goo.gl/maps/jlnjQ

I first tried dropping a pin up in northeastern Kentucky in Greenup County, where the Ohio River makes a big bend, but the distance was shorter than the Pike County location.

[Eth]

Georgia: Shorter than I thought I'd be able to get, honestly. From the east end of SR 40 in St. Mary's to the end of Bible Gulf Rd in Menlo is 464 miles. The northwest end is actually a couple miles away from the state line; trying to go any farther resulted in the preferred route going through either Alabama or Tennessee (usually I-24 through Chattanooga).

[rarnold]

Idaho: Eastport (northern border) to Henrys Lake (borders Montana, near Targhee Pass and Yellowstone NP) 892 miles thru Idaho, only 483 miles thru Montana.

[ctsignguy]

For Ohio, i get roughly 330 miles from Oh 7/Ohio 531 in Conneaut to US 50 where it crosses I-275 just before both duck into Indiana (west side of Cincinnati) as the longest distance in the same state

[corco]

How do you get 892? The most, I guess, direct way would be via the interstates, which coems to 864. Going what I would use as the fastest way, knowing Idaho, via US 20, comes to 839, and then the shortest and most scenic way comes to 828. Add 5 to those because I was calculating to Porthill instead of Eastport.

Ohhh wait, did you use I-84 to US 95 instead of 84->55->95? I guess that's valid since in New Meadows from US 95 south at the 95/55 junction, you're directed to stay on 95 to get to Boise for some (deprecated) reason, but I think most folks would take 55. In that case I think your 892 number uses Oregon 201- 889 is using US 95 on the Idaho side of the river, though Oregon 201 is faster for going from Weiser to the freeway.

Also, why does the Goog hate Idaho 33 through INL so much? That's wide open 65 zone in about as middle of nowhere as you can get.

Idaho is weird though- it's such a disconnected state from end to end- there's a reason Northern Idaho hates Boise.

[Charles2]

Alabama: Dauphin Island (S of Mobile) to Stevenson in the NE corner of the state, 421 miles

https://www.google.com/maps/preview?ie=UTF-8&hl=en#!data=!4m18!3m17!1m1!1sDauphin+Island%2C+AL!1m5!1sStevenson%2C+AL!2s0x8861b95b6cb31eb7%3A0xb250968f43d90d40!3m2!3d34.8686932!4d-85.8394199!3m8!1m3!1d2907414!2d-86.9440251!3d32.636081!3m2!1i1152!2i649!4f13.1&fid=0

[kurumi]

Connecticut: 151 miles, 2 hr 29 minutes (11 hours in traffic :-)
New York: 548 miles, 8:57
Hawaii: 122 miles, 2:36

[NE2]

New York: 548 miles, 8:57

554 if you make the minimum change to force it to stay in New York (i.e. adding a point on the Tappan Zee).

Though frankly the exactness of the start point is rather silly IMO, taking advantage of details of the Goog's algorithms.

[bassoon1986]

Here's the longest I could find in Texas:  http://goo.gl/maps/J7EMc

It's 942 miles, 14 hours and 26 minutes
NE of El Paso to East of Burkeville


I tried north to south. From a spot near TX/NM/OK border to Boca Chica Beach east of Brownsville:
930 miles, 14 hours and 24 minutes

[Buck87]

For Ohio, i get roughly 330 miles from Oh 7/Ohio 531 in Conneaut to US 50 where it crosses I-275 just before both duck into Indiana (west side of Cincinnati) as the longest distance in the same state

As far as longest top Google suggested route in the same state goes, I played around with that basic route and found one that's 350 miles from a point on US 52 southeast of Cincinnati to the OH/PA border on US 20. This is due to Google preferring to take 52 back to Cincinnati before heading northeast.

5 hours, 35 minutes

[Road Hog]

Oklahoma is a state almost as wide as Texas from end to end, thanks to the Panhandle.

From Kenton, OK (at the foot of Black Mesa in the Panhandle) to Tom, OK (in the SE corner) is 629 miles, all but about 25 of it along OK-3. From the New Mexico border to the Arkansas border makes it 636 miles along this route.

Teh Googles also takes you along better roads through Oklahoma (US 412, Indian Nation Turnpike, etc.) which stretches the mileage from border to border to 660 miles. A third suggested route gets you there almost exclusively through Texas via Amarillo and Wichita Falls. All three routes will take you about 10 1/2 hours, plus or minus a few minutes.

[CNGL-Leudimin]

Wow, I managed to squeeze a 400 mile route within a single region of Spain. Thanks, Andalusia.

[agentsteel53]

I tried to do Chile, but even where there is a connection without ferries (say, the corner at the Bolivia border, down to Puerto Montt), Google Maps refuses to do the routing. 

[CNGL-Leudimin]

Forget that and go to China. This route is all within Tibet, and falls 22 miles short of the 2,000 mark.

Edit: Whoa, This route peaks at almost 2,400 miles long all the way in Inner Mongolia. I had to modify the route in order to avoid entering Hebei.

[agentsteel53]

this is approximately the longest you can drive on the planet, period.

http://goo.gl/maps/ExY4J

Cape of Good Hope, South Africa, to Magadan, Russia.  nearly 24000 kilometers.

there is a ferry across the Red Sea, because it appears the Egypt/Israel border is closed - at least, Google refuses to route through it.  the all-land "political concerns get fucked" distance probably tips it over 24000.

there may be other ferries across rivers which I wasn't paying too close attention to.

[agentsteel53]

btw, Google Maps is astonishingly useless in South America.

7392 miles from Deadhorse to the north end of the Darien Gap in Panama.  calculating from the south end of that gap (Turbo, Colombia) to even Santiago, Chile is not possible for whatever reason.  I know it can be done on the Pan-Am, but I am too lazy to figure out how.

[Scott5114]

From Kenton, OK (at the foot of Black Mesa in the Panhandle) to Tom, OK (in the SE corner) is 629 miles, all but about 25 of it along OK-3. From the New Mexico border to the Arkansas border makes it 636 miles along this route.

You can add another mile if you ditch OK-3 at Idabel, then take US-259 south, then OK-87 east to the Arkansas line.

[Alps]

Here's one I got for New Jersey: http://goo.gl/maps/GIyvv

3 hours, 207-211 miles. (yours may differ)

You cheated with a reroute! Here's 215 with no reroute: http://goo.gl/maps/hzQ0T

[hotdogPi]

this is approximately the longest you can drive on the planet, period.

http://goo.gl/maps/ExY4J

Cape of Good Hope, South Africa, to Magadan, Russia.  nearly 24000 kilometers.

there is a ferry across the Red Sea, because it appears the Egypt/Israel border is closed - at least, Google refuses to route through it.  the all-land "political concerns get fucked" distance probably tips it over 24000.

there may be other ferries across rivers which I wasn't paying too close attention to.

+2 hours, +127 kilometers. Not yet at 24000 though.

http://goo.gl/maps/bgVOq

[agentsteel53]

+2 hours, +127 kilometers. Not yet at 24000 though.

http://goo.gl/maps/bgVOq

still uses that ferry. 

for some reason, Google maps refuses to route across certain borders.  Jordan-Iraq for example.  in fact, it doesn't even show the existence of particular border crossings: I cannot find any between Israel and Jordan, even though other sources clearly state that they exist.

I think, given the size of Egypt, you can probably get the Cape-Magadan run over 25000 if you avoid the ferry.  you just have to go through several states which Google Maps apparently refuses to give full diplomatic recognition to.  in conclusion: go fuck yourself, Google Maps.

[1995hoo]

I got it to 24,006 using that ferry by moving the start point around the Cape Town area and by moving the end point to what Google Maps shows as the west end of a coast road that may or may not actually run out of Magadan only to dead-end to the west. (I have no idea whether it really exists and am construing it from the standpoint of what is "Google Mappable.")

http://goo.gl/maps/l00Je


Edited to add: The OP said we're not allowed to drag the route around to extend the route, which is fair for the "within a state" distance. In terms of South Africa to Magadan I decided to see if I could push it over 40,000 km, however, subject the proviso of not doubling back for any significant distance (which prevented a side trip to the UK). I came up with this route of 40,773 km:

http://goo.gl/maps/eMTcr

Surely I could make it a whole lot longer without too much difficulty, but I didn't see much point. It refused to let me drag the route around to the east from Pakistan without going all the way back. I guess the Himalaya obstacle is simply too severe. There is a road from Nepal to Tibet, but I read somewhere the Chinese do not allow vehicles to cross.

[dgolub]

Connecticut: 151 miles, 2 hr 29 minutes (11 hours in traffic :-)
New York: 548 miles, 8:57
Hawaii: 122 miles, 2:36

The New York one goes through New Jersey and Pennsylvania.  If you start at Montauk Point and follow the Thruway (I-87/I-90) all the way to the Pennsylvania border, it's 615 miles.