Highest Exit Sum in Your State...

[pianocello]

In Iowa, it's I-80 and US 61: 295+123=418.

If the Iowa DOT decided to make all of the Avenue of the Saints' exit numbers consistent, the interchange with I-35 would be 190+253=443. But for the time being, an exit number based on the mileage of US 18 is used at that interchange.

[GaryV]

For Michigan it has to be 469 (I-94 and I-69 in Port Huron).

Too bad US-2 and M-28 don't have "exits" to I-75 (both have mile markers).  They'd be in the 650 to 670 range.

[roadman65]

In NJ the highest exit number would be the I-80 and Garden State Parkway interchange in Saddle Brook.

The GSP 159
I-80 @ 52
Sum- 211

[hotdogPi]

In NJ the highest exit number would be the I-80 and Garden State Parkway interchange in Saddle Brook.

The GSP 159
I-80 @ 52
Sum- 211

Pennsylvania's largest sum is because of the way the Turnpike's and I-76's exit numbers are handled. The roads are one and the same for 326 miles until Valley Forge, after which both I-76 on the Schuylkill Expressway and I-276 on the Turnpike continue the exit numbers up to 351 and 358, respectively. Valley Forge is thus both Exit 326 of I-76 and Exit 326 of I-276, for a sum of 652. Quite a big number for state only about 300 miles across.

Correct me if I'm wrong, but there is no Exit 326 on the Schuylkill Expressway. The last exit is 327 and the Turnpike entrance is not marked as an exit.

New Jersey has Exit 354 on I-76 before NJ exit numbers kick in. Unfortunately it leads to Exit 1 of I-676 meaning the sum is only 355. Aside from that, the Garden State Parkway / I-80 interchange is 159+62 = 221 which is the maximum I believe.

[roadman65]

Though totally accurate, many of us tend to not think of the Delaware River Port Authorities little stint of using PA mileage to sign a NJ exit.

Yes that is higher than the GSP/ I-80 Exchange being it is signed as such whether good or bad judgement it is signed.

[SSR_317]

For my native state of Indiana it's almost certainly where the Toll Road meets I-69: 144 + 356 = 500

I hated the renumbering of "classic" I-69's exits (the southern extension SHOULD have been designated as I-63, IMHO!), but somehow it is appropriate that the sum of these two is now 500, in the state that is the home to the World's Most Famous Race, the Indy 500!

[jflick99]

For Kansas, it's in Kansas City at I-70 (Exit 411) and I-435 (Exit 12) for a total of 423. Narrowly beats I-70's interchange with I-635 a few miles away (418 + 4 = 422).

[hotdogPi]

For Kansas, it's in Kansas City at I-70 (Exit 411) and I-435 (Exit 12) for a total of 423. Narrowly beats I-70's interchange with I-635 a few miles away (418 + 4 = 422).

I-70 (Exit 366) and I-470 (Exit 183). 366+183=549.

[jeffandnicole]

In NJ the highest exit number would be the I-80 and Garden State Parkway interchange in Saddle Brook.

The GSP 159
I-80 @ 52
Sum- 211

Pennsylvania's largest sum is because of the way the Turnpike's and I-76's exit numbers are handled. The roads are one and the same for 326 miles until Valley Forge, after which both I-76 on the Schuylkill Expressway and I-276 on the Turnpike continue the exit numbers up to 351 and 358, respectively. Valley Forge is thus both Exit 326 of I-76 and Exit 326 of I-276, for a sum of 652. Quite a big number for state only about 300 miles across.

Correct me if I'm wrong, but there is no Exit 326 on the Schuylkill Expressway. The last exit is 327 and the Turnpike entrance is not marked as an exit.

New Jersey has Exit 354 on I-76 before NJ exit numbers kick in. Unfortunately it leads to Exit 1 of I-676 meaning the sum is only 355. Aside from that, the Garden State Parkway / I-80 interchange is 159+62 = 221 which is the maximum I believe.

Ok, I wasn't going to bitch when someone first ignored my answer, but seriously now. Take me off your blocked list or whatever...

Reponse #6 or #7:

NJ has an oddball winner:

I-76 Exit 354 plus I-676 Exit 1 = 355

[bzakharin]

Ok, I wasn't going to bitch when someone first ignored my answer, but seriously now. Take me off your blocked list or whatever...

Reponse #6 or #7:

NJ has an oddball winner:

I-76 Exit 354 plus I-676 Exit 1 = 355

Apologies, can't imagine how I didn't see it.

[SkyPesos]

Ohio's mentioned above already: I-71 (247) + I-90 (170) + I-490 (1) = 418
Kentucky's is I-71/75 (185) + I-275 (84) = 269
Think Massachusetts would have a new (much higher) answer with their distance based exits conversion.

Now at the risk of creating a duplicate thread, what is the lowest sum of exits in your state? For Ohio, it's probably I-670 (2) + OH 315 (1) = 3. Theoretically, the one at I-71/I-75/US 50 should have a sum of 2, but exits on Fort Washington Way (I-71) aren't signed for some reason, so that one is out.

[I-55]

Tennessee: I-40 @ I-75 western junction: 368 + 84 = 452

Mississippi: I-55 @ I-69 @ I-269: 283 + 1 + 0 = 284 (when I-69 has numbered exits in the distant future this number will be higher) Exit 291 on I-55 surpasses this by 7.

Arkansas: I-40 @ I-30: 153 + 143 = 296

[NWI_Irish96]

For my native state of Indiana it's almost certainly where the Toll Road meets I-69: 144 + 356 = 500

The 356 alone is higher than any other sum anywhere else in the state.

[Ben114]

Think Massachusetts would have a new (much higher) answer with their distance based exits conversion.

Massachusetts would go to 172 when MA 2 (with exit 127) and I-95 (with exit 45) are renumbered.

[oscar]

For California, I-5(678) and CA 44(2). CA 44 is mostly non-freeway, but its west end in the I-5 area is freeway with exit numbers.

Someone from Texas can come up with a higher sum in Houston, along I-10.

[SkyPesos]

Think Massachusetts would have a new (much higher) answer with their distance based exits conversion.

Massachusetts would go to 172 when MA 2 (with exit 127) and I-95 (with exit 45) are renumbered.

Found a higher one: MA 2 (113) and I-495 (78), with a sum of 191.

[paulthemapguy]

The winner is south of Dallas, TX:

I-35E meets I-20 at Exit 418
I-20 meets I-35E at Exit 467

418+467=885

I-69 has new, higher exit numbers, so I-69 meets I-10 at exit 132. On I-10, the exit number is 770.  So 132 + 770 = 902.

Illinois's highest sum is probably the junction of I-80 and I-57, the only Interstate whose exit numbers reach the 300's.  There, you have 345 + 151 = 496.

[Ketchup99]

Pa's is at the Junction Of I-81 Exit 194 and I-476  Exit 131  near Scranton  for a total of 325. It could possibly !-76   and I-95 In Phila  but I dont think there is a direct connection between them

There indeed is a direct connection, and it adds to 370. But like you said above, 80 and 81 is the highest - 411.

[1995hoo]

VA's is I-64/264/664 in Bowers Hill at 299 + 15 + 1 = 315, narrowly beating out I-64 / I-81 in Staunton at 221 + 81 = 308.

I was wondering if both routes must have exit numbers to be eligible for this game. That is, if one road has no exit number, then it might be assigned zero, such that Virginia's highest would probably be the northernmost exit on I-81 (Exit 323 + 0 = 323). I could see that being deemed "too easy," though, or alternatively too ambiguous in the context of there being those rare exits in a few places that are actually numbered Exit 0.

[Bickendan]

Within CA, the highest-numbered double-Interstate interchange would be I-5 (exit 522) with I-80 (exit 86), rendering a total of 608.  Of course, as has been previously stated, I-5 with CA 44 is somewhat higher (680); that's the farthest north freeway-to-freeway interchange in CA with exit numbers for both intersecting routes.  Of course, it would have been considerably higher prior to the rerouting of CA 299 in the Redding area several years back; if anyone has any pix of a EB CA 299 exit number at the I-5 interchange (if indeed exit numbering had been applied to 299 before the switch), please post if just for the purposes of edification!

(Data from OpenStreetMap)

I-5 and CA 99. 525+306=831.

Overlooked that one; when I was living up in that area, the 5/99 interchange utilized 5's numbers for the whole shooting match; apparently that's changed with the extension of the CA 99 freeway.  Thanks to 1 for unearthing that piece of info -- that indeed would be the highest aggregate exit # within the state!

Another one missed: US 101 at CA 299. 716 + 1 = 717.
I note OSM doesn't show an exit number for 299 at 101 itself, but per CalTrans rules, it would be westbound's 1.

Oregon: I-5 @ OR 62 (presumptive future): 30+1=31
I-5 @ OR 58 (presumptive): 188+1=189
I-5 @ I-105/OR 126: 194+4=198
I-5 @ OR 569: 195+12=207
I-5 @ OR 22/99EB: 253+1=254
I-5 @ I-205 (implied; I-205's not signed): 288+1=289
I-5 @ OR 217 (implied; OR 217's not signed): 292+8=300
I-5 @ I-405 (implied; SB 405 not signed, but NB @ Harbor within interchange is): 299+1=300
I-5 @ I-84/US 30 (implied; 84 not signed and WB 1 is @ Lloyd Blvd): 301+1=302
I-5 @ I-405/US 30 (implied; 405 not signed...): 302+4=306
I-84/US 30 @ I-205, Gateway: 6+21=27
I-84/US 30 @ I-205, Maywood Park: 9+22=31
I-205 @ OR 213 (presumptive): 10+1=11
I-205 @ OR 213 and 224 (presumptive): 13+11+5=29 (owing to 213's 0 being at Airport Way and not at I-205 or in Salem)
I-405 @ US 26: 1+74=75
I-405 @ US 30 (implied; also, this is the '0' for this portion of US 30): 3+1=4
US 26 @ OR 6 (presumptive): 53+51=104
US 26 @ OR 217 (implied; NB 217 not signed): 69+1=70
US 26 @ OR 35 (presumptive): 59+59=118
US 97 @ OR 58 (presumptive): 195+85=280
(Digging up what US 101's at US 26 and OR 18, as well as OR 99E at 224 is not worth the effort)
With all that noted: I-5 @ I-405/US 30 wins.

Applying CalTrans rules (ie, each route getting exit numbers based on distance from their 0, and not from the route's respective highway's 0):
I-5 @ OR 62, 58, 569, 217, I-205, 405 (south): No change.
I-5 @ I-105/OR 126 (presuming I-105 adopts OR 126's): 194+57=251
I-5 @ OR 22/99EB: 253+57=310
I-405 @ US 30 (setting 0 in Astoria instead of Portland): 4+95=99
I-5 @ I-405/US 30: 302+4+100=406*
I-5 @ I-84/US 30: 300+1+102=403*
*Note: This is assuming that US 30's would be able to supercede an Interstate's. As it's very unlikely, continuing US 30's sequence over I-84 is pointless.
Finally: US 26 @ OR 35: 135+1=136**
**This puts OR 35's 0 on Mt Hood, not at the Ross Island Bridge where it currently is.
Tentatively, I-5 @ OR 22/99EB wins this one.

[oscar]

Another one missed: US 101 at CA 299. 716 + 1 = 717.
I note OSM doesn't show an exit number for 299 at 101 itself, but per CalTrans rules, it would be westbound's 1.

Caltrans disobeys those supposed "rules": in both directions, it assigns exit number 1 to the CA 299/Guintoli Lane interchange, and no CA 299 exit number at all to its interchange with US 101.

https://dot.ca.gov/-/media/dot-media/programs/safety-programs/documents/exit/f0017877-299-a11y.pdf

That conforms to the signage (or lack thereof) I saw last time I was up there.

The Cal-NExUS exit list also says that CA 299 has no exit number for its junction with I-5.

[Dirt Roads]

Not worth mentioning, but West Virginia only has a handful of them:

I-77 at I-64 south of Beckley:  40+121 = 161
I-64 at I-77 in Charleston:  59+101 = 160
I-77 at I-79 just north of there:  104+0 = 104

I-70 at I-470 in Wheeling is not marked for I-470.  But if it were, it would be Exit 6.  5A+6 = 11
I-64 at US-52 in West Huntington is not marked for US-52.  But US-52 is technically a Super 2 here, albeit a very short one.  It has 3 exits, and I-64 could be marked as Exit 1C:  6+1 = 7

[FrCorySticha]

Montana only has 3 mainline to mainline interchanges and two other freeway to freeway interchanges.

#1: I-94 terminus & I-90 near Billings: 0+456=456
#2: I-90 & I-15 east of Butte: 227+129=356
#3: I-90 & I-15 west of Butte: 219+121=340

[Great Lakes Roads]

Not worth mentioning, but West Virginia only has a handful of them:

I-77 at I-64 south of Beckley:  40+121 = 161
I-64 at I-77 in Charleston:  59+101 = 160
I-77 at I-79 just north of there:  104+0 = 104

I-70 at I-470 in Wheeling is not marked for I-470.  But if it were, it would be Exit 6.  5A+6 = 11
I-64 at US-52 in West Huntington is not marked for US-52.  But US-52 is technically a Super 2 here, albeit a very short one.  It has 3 exits, and I-64 could be marked as Exit 1C:  6+1 = 7

You forgot about the I-68/I-79 interchange in Morgantown: 148+0= 148

[JasonOfORoads]

Within CA, the highest-numbered double-Interstate interchange would be I-5 (exit 522) with I-80 (exit 86), rendering a total of 608.  Of course, as has been previously stated, I-5 with CA 44 is somewhat higher (680); that's the farthest north freeway-to-freeway interchange in CA with exit numbers for both intersecting routes.  Of course, it would have been considerably higher prior to the rerouting of CA 299 in the Redding area several years back; if anyone has any pix of a EB CA 299 exit number at the I-5 interchange (if indeed exit numbering had been applied to 299 before the switch), please post if just for the purposes of edification!

(Data from OpenStreetMap)

I-5 and CA 99. 525+306=831.

Overlooked that one; when I was living up in that area, the 5/99 interchange utilized 5's numbers for the whole shooting match; apparently that's changed with the extension of the CA 99 freeway.  Thanks to 1 for unearthing that piece of info -- that indeed would be the highest aggregate exit # within the state!

Another one missed: US 101 at CA 299. 716 + 1 = 717.
I note OSM doesn't show an exit number for 299 at 101 itself, but per CalTrans rules, it would be westbound's 1.

Oregon: I-5 @ OR 62 (presumptive future): 30+1=31
I-5 @ OR 58 (presumptive): 188+1=189
I-5 @ I-105/OR 126: 194+4=198
I-5 @ OR 569: 195+12=207
I-5 @ OR 22/99EB: 253+1=254
I-5 @ I-205 (implied; I-205's not signed): 288+1=289
I-5 @ OR 217 (implied; OR 217's not signed): 292+8=300
I-5 @ I-405 (implied; SB 405 not signed, but NB @ Harbor within interchange is): 299+1=300
I-5 @ I-84/US 30 (implied; 84 not signed and WB 1 is @ Lloyd Blvd): 301+1=302
I-5 @ I-405/US 30 (implied; 405 not signed...): 302+4=306
I-84/US 30 @ I-205, Gateway: 6+21=27
I-84/US 30 @ I-205, Maywood Park: 9+22=31
I-205 @ OR 213 (presumptive): 10+1=11
I-205 @ OR 213 and 224 (presumptive): 13+11+5=29 (owing to 213's 0 being at Airport Way and not at I-205 or in Salem)
I-405 @ US 26: 1+74=75
I-405 @ US 30 (implied; also, this is the '0' for this portion of US 30): 3+1=4
US 26 @ OR 6 (presumptive): 53+51=104
US 26 @ OR 217 (implied; NB 217 not signed): 69+1=70
US 26 @ OR 35 (presumptive): 59+59=118
US 97 @ OR 58 (presumptive): 195+85=280
(Digging up what US 101's at US 26 and OR 18, as well as OR 99E at 224 is not worth the effort)
With all that noted: I-5 @ I-405/US 30 wins.

Applying CalTrans rules (ie, each route getting exit numbers based on distance from their 0, and not from the route's respective highway's 0):
I-5 @ OR 62, 58, 569, 217, I-205, 405 (south): No change.
I-5 @ I-105/OR 126 (presuming I-105 adopts OR 126's): 194+57=251
I-5 @ OR 22/99EB: 253+57=310
I-405 @ US 30 (setting 0 in Astoria instead of Portland): 4+95=99
I-5 @ I-405/US 30: 302+4+100=406*
I-5 @ I-84/US 30: 300+1+102=403*
*Note: This is assuming that US 30's would be able to supercede an Interstate's. As it's very unlikely, continuing US 30's sequence over I-84 is pointless.
Finally: US 26 @ OR 35: 135+1=136**
**This puts OR 35's 0 on Mt Hood, not at the Ross Island Bridge where it currently is.
Tentatively, I-5 @ OR 22/99EB wins this one.

If we're going by what's signed in the field -- thereby excluding all unnumbered exits -- I-5/OR-22/OR-99EB wins with 254.

I really wish Oregon would just number exits at the termini.