Interstate exit violations

[burgess87]

New York uses N-S and E-W suffixes (as opposed to A-B) in cases where more than one ramp serves the same "Exit".  I don't recall seeing that practice in any other state but I don't know if it's unique to New York.

Not all of New York.  The Rochester and Buffalo areas use A/B.

I've seen a couple of E/W designations still alive & well on the mainline Thruway (specifically exits for NY 33 and Walden AVE).

[citrustaco]

There is an Exit 0 from Kentucky to Indiana on I-65.

[rawmustard]

There is an Exit 0 from Kentucky to Indiana on I-65.

Yeah, the exit to downtown Jeffersonville. But there's no violation.

ETA: And before people try to spout off more Exit 0s here, it's already been done.

[tdindy88]

Another Indiana example, currently there are two Exit 22s on I-69, one in Gibson County near I-64 on the new stretch of I-69 and one in Madison County in the central part on the traditional part of I-69. However, this should be rectified soon as INDOT is petitioning to AASHTO to get the I-69 route in Southern Indiana approved so they can change the exit numbers further north. Exit 0 at I-465 will become Exit 184 and what is now Exit 22 will be Exit 206.

[citrustaco]

Thanks for the heads up on I-69 and renumbering.

[Duke87]

What are they using as the new zero mile marker? If it's anything other than the future Ohio River crossing, they're just going to have to renumber the exits again...

[UptownRoadGeek]

New York uses N-S and E-W suffixes (as opposed to A-B) in cases where more than one ramp serves the same "Exit".  I don't recall seeing that practice in any other state but I don't know if it's unique to New York.

Mississippi used to do this before they switched to mileage based exit numbers

There is an Exit 0 from Kentucky to Indiana on I-65.

This is common in Alabama.

[Ian]

New York uses N-S and E-W suffixes (as opposed to A-B) in cases where more than one ramp serves the same "Exit".  I don't recall seeing that practice in any other state but I don't know if it's unique to New York.

I recall seeing some of these in Connecticut.

[rickmastfan67]

New York uses N-S and E-W suffixes (as opposed to A-B) in cases where more than one ramp serves the same "Exit".  I don't recall seeing that practice in any other state but I don't know if it's unique to New York.

PA has also done this.

And here's an example:  I-80 WB Exit #212W

Yet, the EB side uses A&B.

[BigMattFromTexas]

All I've seen is "A,B,C, etc" I think it would be interesting to see an "E,W,N, or S" one. But I don't think that's gonna happen any time soon.

[mukade]

Another Indiana example, currently there are two Exit 22s on I-69, one in Gibson County near I-64 on the new stretch of I-69 and one in Madison County in the central part on the traditional part of I-69. However, this should be rectified soon as INDOT is petitioning to AASHTO to get the I-69 route in Southern Indiana approved so they can change the exit numbers further north. Exit 0 at I-465 will become Exit 184 and what is now Exit 22 will be Exit 206.

Because of the I-74 concurrency with I-465, I-74 in Indiana has two of the following exit numbers: exit 4, exit 8, and exit 52. Depending on how the new US 136/Crawfordsville Rd exit is numbered, there could also be two exit 15s. A similar situation with I-69 where it overlaps I-465 may permanently create duplicate exit numbers there as well.

[Duke87]

All I've seen is "A,B,C, etc" I think it would be interesting to see an "E,W,N, or S" one. But I don't think that's gonna happen any time soon.

Dunno about all four, but there are definitely a couple cases with three:

- The Wilbur Cross Parkway (CT 15) northbound has exits 68W-N-E for I-691, I-91, and CT 66 (respectively)
- The Belt Parkway westbound has exits 17N-W-S for Cross Bay Boulevard north/south and NY 27 (North Conduit Avenue) west.

[SEWIGuy]

I believe that the exit numbers on interstate multiplexes should use the mileage of the lowered number interestate. 

If that is correct, when I-39 was extended over I-90 and I-90/94 in Wisconsin, WIDOT didn't change the interstate exit numbers to reflect I-39's mileage.  They still use I-90s numbers.

[Brandon]

I believe that the exit numbers on interstate multiplexes should use the mileage of the lowered number interestate. 

If that is correct, when I-39 was extended over I-90 and I-90/94 in Wisconsin, WIDOT didn't change the interstate exit numbers to reflect I-39's mileage.  They still use I-90s numbers.

Yes, they still use I-90's numbers (why change?).  I-39 also uses US-51's numbers north of Portage.

[SSOWorld]

I believe that the exit numbers on interstate multiplexes should use the mileage of the lowered number interestate. 

If that is correct, when I-39 was extended over I-90 and I-90/94 in Wisconsin, WIDOT didn't change the interstate exit numbers to reflect I-39's mileage.  They still use I-90s numbers.

Yes, they still use I-90's numbers (why change?).  I-39 also uses US-51's numbers north of Portage.

and "South" (WIS 78's #s were an extension southward of US 51's numbers) to I-90.

[golden eagle]

I believe that the exit numbers on interstate multiplexes should use the mileage of the lowered number interestate. 

If that is correct, when I-39 was extended over I-90 and I-90/94 in Wisconsin, WIDOT didn't change the interstate exit numbers to reflect I-39's mileage.  They still use I-90s numbers.

Mississippi uses I-59's mileage when they're multiplexed with I-20 in the Meridian/Lauderdale County area.

[mightyace]

^^^

Is there any rule for which set of exit numbers to use on a multiplex?

I've really never seen a pattern, but that doesn't mean there's no rule.

[TheStranger]

^^^

Is there any rule for which set of exit numbers to use on a multiplex?

I've really never seen a pattern, but that doesn't mean there's no rule.

In California, I THINK it's ordered in terms of route priority (Interstate - then US - then state) with the lower-numbered route first, though there are few instances where this is truly a factor (i.e. the Route 99 concurrencies in Sacramento, the 5/10 concurrency in East Los Angeles).

[Bickendan]

I had the impression that's how the FHWA prefers it, too.

[rickmastfan67]

I think it has to do with whatever route is the through route there.  In the case of I-77 and I-81, they use I-81's exit numbers because I-77 leaves/joins the highway on both ends.

[Scott5114]

I think it has to do with whatever route is the through route there.  In the case of I-77 and I-81, they use I-81's exit numbers because I-77 leaves/joins the highway on both ends.

But on I-35/40, I-35 numbers take precedence, when I-40 is the "through route".

[bulldog1979]

I think it has to do with whatever route is the through route there.  In the case of I-77 and I-81, they use I-81's exit numbers because I-77 leaves/joins the highway on both ends.

And sometimes it's which ever was there first. I-96/I-69 in Lansing, MI has I-96 milemarkers and exit numbers. I-69 came some 30 years later.

[mapman]

In California, I THINK it's ordered in terms of route priority (Interstate - then US - then state) with the lower-numbered route first, though there are few instances where this is truly a factor (i.e. the Route 99 concurrencies in Sacramento, the 5/10 concurrency in East Los Angeles).

Actually, it's based upon the true route number on that particular segment.  The state route definitions in California do not include route concurrencies, regardless of how the roadway may be signed.

[TheStranger]

In California, I THINK it's ordered in terms of route priority (Interstate - then US - then state) with the lower-numbered route first, though there are few instances where this is truly a factor (i.e. the Route 99 concurrencies in Sacramento, the 5/10 concurrency in East Los Angeles).

Actually, it's based upon the true route number on that particular segment.  The state route definitions in California do not include route concurrencies, regardless of how the roadway may be signed.

On the surface, I'd agree - I do however recall the Calnexus website giving the explanation of route priority/lowest digit. 

5/10, 99/5, Business 80/50/99, 580/80, 215/60, and 405/22 I think are the only significant freeway/freeway concurrencies left in California, at least at the present time. 

Business 80 and US 50 represents the only example of two different routes sharing a set of exit numbers (from I-80 east to the Oak Park Interchange), with Business 80/hidden Route 51 continuing on with Exit 7 as well as US 50.

[froggie]

New York uses N-S and E-W suffixes (as opposed to A-B) in cases where more than one ramp serves the same "Exit".  I don't recall seeing that practice in any other state but I don't know if it's unique to New York.

I know of 2 cases where this format is used in Vermont.  One is on I-91 at I-89 (Exit 10N-S).  The other is on I-89 at US 2 in Burlington (Exit 14E-W).  Coincidentally, I believe these (and I-93 at I-91, but that's unnumbered) are the only multi-exit interchanges in the state, though that will change when the northeast quadrant of the Bennington bypass opens.

On a related note, the interchanges on both I-89 and I-93 at I-91 are unnumbered.  I-89 would/should be Exit 1A-B regardless of whether a sequential-based or mile-based system is used.  I-93 would/should be Exit 2A-B with a sequential-system and Exit 11A-B with a mile-based system.