Exit 0. How often is there one?

[mukade]

Good point - it could be I-169 or something similar, but it would be a very short route. I think I-69 itself will have its first exit around two or three miles in.

[Ian]

The very south end of the Garden State Parkway in Cape May, NJ is marked as an exit 0.

[jdb1234]

I-65 has an Exit 0 at I-10 in Mobile.

[thenetwork]

Back in the mid-80s, Arizona had an Exit 0 (km!  ) on I-19 going into Nogales on the US side, which has since been changed to Exit 1-A.   

I wonder if the change to 1-A was to avoid confusion for motorists thinking that Exit 0 would automatically dump drivers into Mexico with no chance of staying in the US?

[Alex]

Exit 0 discussion in 2009.

[roadman65]

Southbound end of I-164 in Indiana.

Forgot that one...so if I-164 is absorbed by I-69, then I-69 would still have an Exit 0....not too shabby! 

Actually, I-69 does have an Exit 0 at its current terminus at I-465 near Indy.

[rickmastfan67]

Forgot that one...so if I-164 is absorbed by I-69, then I-69 would still have an Exit 0....not too shabby! 

Actually, I-69 does have an Exit 0 at its current terminus at I-465 near Indy.

Already mentioned.

[PurdueBill]

Southbound end of I-164 in Indiana.

Forgot that one...so if I-164 is absorbed by I-69, then I-69 would still have an Exit 0....not too shabby! 

Actually, I-69 does have an Exit 0 at its current terminus at I-465 near Indy.

Yes, I was thinking about how I-69 would still have an Exit 0 even after its extension, but I forgot that it's taking over almost all, but not all, of I-164.

[Kacie Jane]

The very south end of the Garden State Parkway in Cape May, NJ is marked as an exit 0.

I've seen it marked as such on many maps, but from my recollection driving it, and from what I can tell on GSV, it's not signed as such in the field.

[Bickendan]

I think the 5/805 split in San Ysidro would qualify for Exit 0 as well since, IIRC, it happens before the first milepost.

No, per California exit numbering policy. The ranges for exit number are dependent on where they are on the mileage: Exit 1's range is milemarker 0-1.5, 2 is 1.5-2.5, 3 is 2.5-3.5, etc.
I suspect that Oregon and Washington use similar schemes, although in OR 217's case, the exit numbers extend past their milemarker range, made painfully evident when the half-mile marker/reassurance shields were erected (ie, Exit 6 is slightly beyond milemarker 7).

[agentsteel53]

I've seen it marked as such on many maps, but from my recollection driving it, and from what I can tell on GSV, it's not signed as such in the field.

I seem to recall it ending at an at-grade intersection which was not numbered as an exit.

[PurdueBill]

A thought about Exit 0 and how it could be justified to states that don't use it occurred to me this afternoon while on I-71.  I realized that Exit 0 is (imo) the best way to signify that an exit is at the state line or the end of the route, while Ohio's mish-mash of uses of Exit 1 is very ambiguous, especially when it comes to the latter case.

• I-271: southbound, there is no choice but the default onto I-71 SB, which nonetheless is signed as Exit 1.
• I-670: westbound, there are exits 1B and 1A followed by the default onto I-70 WB, which doesn't get an exit number at all.
• OH 8: southbound, there are exits 1B and 1A followed by the Central Interchange where "doing nothing" puts you on I-77 SB, but there are also exits for I-76 EB and for I-77 NB/I-76 WB which don't get numbers.
• I-490: westbound, there is an exit 1 for I-71 SB at the 90/71/490 partial stack, with no number for the default onto I-90 WB.

Consistency would suggest that Exit 0 should be used for all 4 cases because the final exits are at or very close to mile 0 at the end of the routes.  The OH 8 case begs for some kind of exit number because all the other exits on all the routes at the Central Interchange have exit numbers; only the ramps from OH 8 to 76 do not, and Exits 1, 2, 3, 4, 5 are all taken (some with suffixes) already to the north--so Exits 0A and 0B would seem appropriate, if it weren't for ODOT not liking Exit 0.  As it is, there are exit numbers for defaults with no choice sometimes and not others.  Using Exit 0 at terminal interchanges would make sense and signal that the route number is ending so even if you "do nothing" you will be on a different route.  (I've experienced talking to more than one confused visitor to Akron who didn't realize for miles that they were no longer on Route 8 after crossing I-76 because they missed the "END 8" posted in (of all places) the overhead pull-through BGS for I-77 SB.  If it were part of an Exit 0, maybe that would be more of a signal.

[vdeane]

IMO terminal interchanges shouldn't have any exit numbers at all.  This is how it's done in NY (with the exceptions of NY 390 at the parkway and I-781).

[roadman65]

IMO terminal interchanges shouldn't have any exit numbers at all.  This is how it's done in NY (with the exceptions of NY 390 at the parkway and I-781).

I-4 in Florida uses no exit numbers at both terminals except for FL 400 (the continuation of I-4 after it ends at the east terminus) and Downtown Jefferson Street ramp in Tampa (that uses I-275's numbering scheme).

[deathtopumpkins]

IMO terminal interchanges shouldn't have any exit numbers at all.  This is how it's done in NY (with the exceptions of NY 390 at the parkway and I-781).

Even if the road itself phyiscally continues, just not as a freeway? I'd agree about not giving terminal interchanges exit numbers so long as it's just a simple split for each direction. Anything more complicated deserves exit numbers.

[PurdueBill]

IMO terminal interchanges shouldn't have any exit numbers at all.  This is how it's done in NY (with the exceptions of NY 390 at the parkway and I-781).

Even if the road itself phyiscally continues, just not as a freeway? I'd agree about not giving terminal interchanges exit numbers so long as it's just a simple split for each direction. Anything more complicated deserves exit numbers.

I could live with that if Ohio would get consistent with it.  The four different scenarios I listed above (two endings defaulting onto another freeway with no other choice, two where the route number ends at an interchange where you can exit onto another route or default onto yet another) are all handled differently.  The way that Indiana handles the endings of I-69 and I-469 are ideal and like you mention--the road continues onto a non-freeway and the exits from the mainline are Exit 0 (A-B on 469) while the default onto the non-freeway is unnumbered but well-signed with pull-throughs.  The end of Route 8 in Akron really bugs me because all of the other movements at that interchange are either thru movements on route numbers or posted with exit numbers (exits 23A-B on I-76 or exit 125 on I-77), but being the south end of Route 8, the exits from 8 SB did not get exit numbers when ODOT numbered exits on 8 a few years ago.  Thus there is a default onto another freeway route number and two exits that don't get numbers either, and navigation there would be helped by exit numbers.

[njroadhorse]

The very south end of the Garden State Parkway in Cape May, NJ is marked as an exit 0.

I've seen it marked as such on many maps, but from my recollection driving it, and from what I can tell on GSV, it's not signed as such in the field.

I can tell you for a fact that the new BGSes they put up at Exit 0 do, in fact, have an Exit 0 tab on them.

[vdeane]

IMO terminal interchanges shouldn't have any exit numbers at all.  This is how it's done in NY (with the exceptions of NY 390 at the parkway and I-781).

Even if the road itself phyiscally continues, just not as a freeway? I'd agree about not giving terminal interchanges exit numbers so long as it's just a simple split for each direction. Anything more complicated deserves exit numbers.

Well, at least in upstate NY, that doesn't happen on roads that have exit numbers... the closest is the Adirondack Northway, which has its own issues.

[Kacie Jane]

The very south end of the Garden State Parkway in Cape May, NJ is marked as an exit 0.

I've seen it marked as such on many maps, but from my recollection driving it, and from what I can tell on GSV, it's not signed as such in the field.

I can tell you for a fact that the new BGSes they put up at Exit 0 do, in fact, have an Exit 0 tab on them.

Not that I don't believe you -- I do, it's been a long time since I've been down that way myself -- but if you have or come across a picture, I'd love to see it.

Is Exit 0 just the slip ramp to 109 North?  Or does the BGS refer to the whole intersection as Exit 0?

[njroadhorse]

The very south end of the Garden State Parkway in Cape May, NJ is marked as an exit 0.

I've seen it marked as such on many maps, but from my recollection driving it, and from what I can tell on GSV, it's not signed as such in the field.

I can tell you for a fact that the new BGSes they put up at Exit 0 do, in fact, have an Exit 0 tab on them.

Not that I don't believe you -- I do, it's been a long time since I've been down that way myself -- but if you have or come across a picture, I'd love to see it.

Is Exit 0 just the slip ramp to 109 North?  Or does the BGS refer to the whole intersection as Exit 0?

They refer to the whole intersection as Exit 0, but they don't denote a difference (like A and B) for the directions you can go at the intersection.

[sp_redelectric]

I suspect that Oregon and Washington use similar schemes, although in OR 217's case, the exit numbers extend past their milemarker range, made painfully evident when the half-mile marker/reassurance shields were erected (ie, Exit 6 is slightly beyond milemarker 7).

One would think that for highways less than 10 miles (?) exit numbering should just be sequential rather than by milepost.  Once the highway is longer than 10 miles (?) milepost numbering begins to make more sense.

[Scott5114]

I suspect that Oregon and Washington use similar schemes, although in OR 217's case, the exit numbers extend past their milemarker range, made painfully evident when the half-mile marker/reassurance shields were erected (ie, Exit 6 is slightly beyond milemarker 7).

One would think that for highways less than 10 miles (?) exit numbering should just be sequential rather than by milepost.  Once the highway is longer than 10 miles (?) milepost numbering begins to make more sense.

But that's how you get fun stuff like suffixes going up to G!

[Roadsguy]

Or X, like on the New Jersey Turnpike (of course, that's only because there's two rail lines that cross near there, not that there are 23 other exits between two original ones.

[agentsteel53]

how high does Exit 2 go in Kansas City?  I believe it uses all but I, O, and Z?  does it use Q?

[ljwestmcsd]

I-264 in Louisville, KY has two exit zeros, 0A goes to Indiana on I-64, and 0B goes towards downtown Louisville