Numberless exits on numbered-exit roads

[Pete from Boston]

Driving I-89 through Vermont and New Hampshire today, I realized that the interstate junctions with neither I-91 nor I-93 are numbered.  Both roads otherwise feature exit numbers.  Both have an Exit 1 that precedes the unnumbered Interstate junction.  They're both the last exit on 89 in their respective state, but the road continues through both (if only barely in NH).

Anyone know why this is done?  Is this common anyplace else? 

[Scott5114]

Some states make a practice to not number Interstate to Interstate interchanges. The theory is that these are not really "exits" as you are not leaving the Interstate System.

[Pete from Boston]

Interesting.  Vermont and New Hampshire seem to both be inconsistent in this regard, because Vermont has exits off 91 for 89 and 93 that are numbered, and one from 89 to 189.  New Hampshire has an exit number from 293 to 93, and one from 93 to 393, but none from 93 to 89 or 293. 

[mhh]

On eastbound Hwy. 402 in Point Edward, Ontario, just east of the Blue Water Bridge customs plaza, there used to be an unnumbered exit to Venetian Boulevard before Exit 1 to Front Street. The Venetian exit was closed when the secondary truck inspection area was expanded a few years ago.

[hotdogPi]

I-93 between exits 34A and 34B (I think). (Even if you say it's not I-93, it's still a numbered-exit road.)

Cemetery on MA 128 North between exits 25 and 24, and then another "exit" just before Exit 21 (not sure why it's even there).

[jemacedo9]

Before PA switched to mile-based, most (if not all) of the interstate-to-interstate junctions were not numbered...excluding the PA Turnpike.

[jp the roadgeek]

There are a couple of exits off the Wilbur Cross Parkway (CT 15) between Exits 66 and 67 that are marked for a DOT Maintenance Garage, but they are regularly used for those who want to use Miller Ave.  Then there's some inconsistencies at the ends of highways.  On CT 9, the southern end exits for I-95 do NOT have numbers, but the northern end exits for I-84 are numbered 31 and 32.  The southern end of I-91 does not have exit numbers for I-95, as does not either end of I-384.  The east end of I-291 does not have exit numbers, but the west end does (1A for I-91 and CT 218, and 1B for I-91 north).  I-691 also has exit numbers (1 & 2) at the west end at I-84.  CT 8's ends are not numbered, as are neither end of US 7.

[Beeper1]

Are the exits for the National Park roads on the NJ side of Del Water Gap on I-80 unnumbered?

[Roadgeek Adam]

Are the exits for the National Park roads on the NJ side of Del Water Gap on I-80 unnumbered?

Millbrook and Flatbrookville (Old Mine Road) is Exit 1 and signed as such.

The Dunnfield Creek Hiking Trailhead is not an numbered exit, nor is the random RIRO-interchange west of exits 4A-C.

[cl94]

New York occasionally doesn't (didn't, in at least one case) number freeway-freeway junctions. Until ~10 years ago, I-90 Exit 6A (I-787) was numberless. The western I-81/NY 17 interchange is unnumbered for both, as is the eastern one if heading east/south. I-81's interchanges with I-88 and I-690 are unnumbered for all freeways.

NYSTA-maintained roads never have numberless interchanges, with the sole exception being the Garden State Parkway Connector. Regions 3 and 9 don't usually number freeway-freeway interchanges unless the Thruway or I-481 is the intersecting road. Notably, just about everything downstate has an exit number, with the exception of a couple unnamed spurs and the Taconic/Sprain Brook, including all freeway-freeway junctions.

[getemngo]

Debatable example: US 31 in Michigan has two unnumbered exits on its expressway section in Holland, Chicago Dr/BL-196 and Lakewood Blvd, even though there is a numbered exit (47) after it separates from I-196, and numbered exits resume when US 31 becomes freeway again in Grand Haven.

You could argue that these exits should be unnumbered because it's not a freeway, but MDOT has been moving toward numbering all exits, and in a similar situation, US 127 has a numbered exit (M-57, exit 109) on its non-freeway portion. But US 31 has new Clearview signs, and still no numbers.

[roadman65]

I-95 is not numbered at the eastern terminus of I-4 near Daytona, but FL 400 is given an exit number at the same interchange.  I am guessing the reason for this is like NY, VT, and NH not numbering interstate to interstate junctions as in theory you are not leaving the interstate system for this, but to exit I-4 onto FL 400 you indeed are.

[vdeane]

Vermont uses more numbers than not.  I-89/189 is 13 for 89 and a terminus for 189.  I-91/93 is 19 for 91 and a terminus for 93.  I-91/89 is an inconsistently signed 10 for 91 and unnumbered for 89.

New York numbers most of them with a few exceptions.  Since the only numbered terminii in NY are I-781, I-99, and NY 390, I'm not counting those situations.  The only unnumbered one in Region 3 is I-690/81.  Region 9 has most of them, including the eastern I-81/86, which is incredibly inconsistent.  I-86 west to I-81 south and US 11 is 75.  I-81 north is 2E for I-86 and 2W for US 11; I-81 south is 2 for US 11 and unnumbered for staying on NY 17/I-86.  Actually, I take that back, it's consistent - the only unnumbered movements are NY 17/I-86 though lanes (unlike the western junction and I-88).  I-90/787 was definitely inconsistent - 5 for 787 and unnumbered for 90 until it became 6A.

[hotdogPi]

Are at-grades considered exits? I mentioned the ones on MA 128 before. There are also the ones on MA 2 (between exits 26 and 33).

And all rest areas.

[sawblade5]

There's the private "Bazaar Cattle Crossing" exit on I-35 Kansas Turnpike in Chase County, KS in the Flint Hills. The signs for that exit are unnumbered and the sign says "Cattle Pens" while the overpass say "Bazaar Cattle Crossing". Here's a Google Street View of the exit: https://goo.gl/maps/5JKeq The reason why I am posting this is, it is signed like an exit but it is a private exit and is unnumbered. If The interchange had an Exit Number, it would be Exit 110.

[Pete from Boston]

Are at-grades considered exits? I mentioned the ones on MA 128 before. There are also the ones on MA 2 (between exits 26 and 33).

And all rest areas.

No, rest areas are not what I'm talking about. I am talking about interchanges with roads that under normal circumstances would be numbered exits, but for some reason in certain situations are not, despite an otherwise consistent sequence of numbered exits.

At-grade intersections are not really relevant for the purposes of the question.

[keithvh]

None of I-71's interchanges in downtown Cincinnati are numbered ------ doesn't matter whether it's going North or South ----- or whether it's an exit to another interstate (I-471, I-75) or an exit to a non-interstate road (3rd Street, Columbia Parkway).


All these, should, in theory be Exits 1A, 1B, 1C, et cetera.

[AsphaltPlanet]

The ramp to Hwy 11, from the 400 north of Barrie, ON does not have a number, despite there being consistent exit numbering throughout the length of the 400.  Apparently once the current construction at that interchange has been completed next year, an exit number will then be posted.

[robbones]

None of I-71's interchanges in downtown Cincinnati are numbered ------ doesn't matter whether it's going North or South ----- or whether it's an exit to another interstate (I-471, I-75) or an exit to a non-interstate road (3rd Street, Columbia Parkway).


All these, should, in theory be Exits 1A, 1B, 1C, et cetera.

I wonder if they did it to keep non locals from getting confused with I 75.

[TheStranger]

In California this almost seems to be handled on a case-by-case basis:

I-80's junction with US 101 is given an exit number off of 101 north (433B) but none so far southbound from the Central Freeway.

US 50/Business 80's west terminus was not given a number from eastbound 80 during the 2009-era Sacramento sign upgrade project; for that matter, at the point where the 50/99/Business 80 concurrency ends along eastbound 50, there are no exit numbers eastbound (but conversely, 6B/6C along westbound 50).

No exit numbers yet at the MacArthur Maze.

[bzakharin]

Where the NJ Turnpike begins off of I-295 North, it is not signed as an exit. In fact, it's the through movement with 3 lanes vs. 2 lanes for I-295. This is surrounded by Exit 1A to the south and 1B to the north.
The NJ Turnpike northbound does not number the exit for US-40, but it's south of the tolls, so isn't "really" on the Turnpike.
A similar situation exists on the US-130 exit on the NJ Turnpike Pennsylvania Extension, though that has a secret exit number (6A).
I-287 doesn't number "Exit 0" for the NJ Turnpike, but you could argue that the exit is on NJ-440 which I-287 becomes at that point, and 440 doesn't number its exits. NJ-18 has 2 freeway segments, but only the southern one has exit numbers.

[bzakharin]

Almost forgot, probably the most pertinent one to the thread. The left exit from I-295 South to NJ-42 South (between Exits 26 and 25) is unnumbered, even though all other exits created by the 295/42/76 interchange project received numbers, including a similar left exit from I-295 North to I-76 West (Exit 27).

[PHLBOS]

Exit for Cornwell Heights Park-and-Ride lot (for SEPTA's Cornwell Heights train station) off I-95 South in Bensalem, PA.

[bzakharin]

Exit for Cornwell Heights Park-and-Ride lot (for SEPTA's Cornwell Heights train station) off I-95 South in Bensalem, PA.

There are several park-and-rides on the Garden State Parkway like this, but they are all also service areas. There's one on the Atlantic City Expressway in Atlantic City in the median, which is signed as a park-and-ride as well, but does have gas stations (yes, plural, it's huge) as well. I'm not sure that should count.

[Pete from Boston]

No, park-and-rides and rest areas pretty much never have exit numbers. There is nothing unusual about them not being numbered.

I am talking about actual exits from the highway to other roads, actual interchanges that lack a number where all or most of the remaining interchanges have numbers, and the omission therefore stands out.