Exit 0. How often is there one?

[OCGuy81]

Looking through an atlas recently, along with the nicely done AARoads focus page on Texas,  I noticed that Texas has two (that I saw) Exit 0's.  The first is on I-10 at the New Mexico state line for FM 1905 serving Anthony.  The other appears to be along I-40 at the New Mexico state line as well.

How many instances are there of an Exit 0?  Is this just a Texas thing?

[The High Plains Traveler]

I saw it at the end of I-172 in Illinois. This is a little different in that it's the last exit on a route, not the first after it crosses a state line.

[algorerhythms]

There's one on I-70 on Wheeling Island in West Virginia.

[Brandon]

Illinois/Indiana along I-90.  This is the State Line Interchange/Exit 0 for the Indiana Toll Road ever since it opened in 1956.  Yes, interchanges along the Toll Road started at 0 even when it used sequential numbering (1956-1980).  It also is Exit 0 for the Chicago (nee Calumet) Skyway as those mileposts start at the state line and go west to the Ryan.

[PurdueBill]

Illinois/Indiana along I-90.  This is the State Line Interchange/Exit 0 for the Indiana Toll Road ever since it opened in 1956.  Yes, interchanges along the Toll Road started at 0 even when it used sequential numbering (1956-1980).  It also is Exit 0 for the Chicago (nee Calumet) Skyway as those mileposts start at the state line and go west to the Ryan.

Yep, Indiana likes Exit 0.  Along with the Indpls. Blvd. exit on I-90, exit 0 appears on I-65, I-69 (original), and I-469, the latter two not being at state lines.

Also, a typical Indy-area sign of the type used for a route joining 465 appears on I-865 WB saying that US 52 WB should follow 865 to Exit 0.  There are no exits on 865 other than the termini, and neither terminus has exit numbers, so the reference to Exit 0 is strange but fun.  If they did number the termini, 865 would have only Exits 0 and 5.

[Mr_Northside]

http://maps.google.com/maps?q=New+Stanton,+PA&hl=en&ll=40.226581,-79.590261&spn=0.010338,0.022724&sll=37.0625,-95.677068&sspn=43.713406,93.076172&t=h&hnear=New+Stanton,+Westmoreland,+Pennsylvania&z=16&layer=c&cbll=40.226877,-79.594584&panoid=ubofAZtbnIkVwtSWA2j85w&cbp=12,338.63,,0,-0.63

The southern end of Toll-66 in New Stanton has some Exit 0's.

[Road Hog]

Weird that Texas has Exit 0's because the TxDOT exit policy seems to be to go to the next higher mile marker. Unless the interchange is smack on the state line, in which I could understand it.

[sp_redelectric]

I-90 at the Montana/Idaho state line has an Exit 0 but that's the only one I know of in the Pacific Northwest.

Several that could legitimately be "Exit 0" aren't:

I-405 in Portland, left-hand exit to Harbor Drive and Naito Parkway, is Exit 1A.  (In fact, Exits 1B and 1C come before Milepost 1, but Exit 1D is after MP 1)

I-5 in Vancouver - SR 14 and Main Street are both less than a half mile from the state line, but are Exits 1A and 1B respectively.  Exits 1C and 1D are just before the milepost.

I-205, also in Vancouver - SR 14 is just over 1/2 mile from the stateline, but in keeping with the milepost concurrency between the two states on 205 it is exit 27 (with Airport Way, on the Oregon side, being Exit 24).

On I-84, the first eastbound exit is definitely well past the milepost, but westbound the ramps to Holladay Street (Rose Quarter/Convention Center) and Morrison Bridge/Oregon 99E could theoretically be Exit 0s...but that would be quite confusing (as one of the exits is located on the transition to I-5 north; the other to I-5 south.)

I-105 in Eugene could have an Exit 0, but it's a never-finished interchange.

[roadman65]

The Golden Glades Interchange on Florida's Turnpike is not Exit 0, but it was 0X.  Sign updates removed it at the Turnpike split near Miramar several years ago.

The "X" is for the extension even though realistically its the mainline.  The numbering system starts at Homstead at US 1 and runs along the Homestead Extension then up the mainline to its terminus at I-75 in Wildwood. 

The other exits along the Turnpike  section between the extension and Golden Glades  that also have an "X" after the number are Exit 2X and 4X.  The former is for the Stadium and the latter is the Northbound Turnpike for the Southbound Homestead Extension. 

[roadfro]

Nevada does not use Exit 0 at all.

If they did, there would be two of them: I-215's southern terminus in Henderson & the Primm exit on I-15 (CA/NV state line).

[SteveG1988]

NJ avoids it with I-295/I-195/NJ29...having the 195/NJ29 ramps be labeled exit 60 instead of exit 0.

[ftballfan]

Michigan avoids it by numbering the end as Exit 1 (I-96, I-696, M-10, M-39*) or leaving it unnumbered (I-196, I-275, I-375**, I-496, I-675, M-6, M-8**)
* - M-39 begins at I-75 but its mileposts begin at I-94, so Exit 1 should be Exit 2 or Exit 3
** - Neither I-375 nor M-8 have numbered exits

[OCGuy81]

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

[corco]

I-184's junction with I-84 is I-184 exit 0

[silverback1065]

i'm pretty sure most highways start with exit 0

[Kacie Jane]

I'm pretty sure you're wrong.

[txstateends]

The other appears to be along I-40 at the New Mexico state line as well.

How many instances are there of an Exit 0?  Is this just a Texas thing?

The I-40 exit at Glenrio is Exit 0.  It's almost fitting since there's almost nothing left there.

[formulanone]

Southbound end of I-164 in Indiana.

[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! 

[The High Plains Traveler]

The other appears to be along I-40 at the New Mexico state line as well.

How many instances are there of an Exit 0?  Is this just a Texas thing?

The I-40 exit at Glenrio is Exit 0.  It's almost fitting since there's almost nothing left there.

At the exit on the south end of I-27 in Lubbock, where it becomes just U.S. 87, it's Exit 1. Then from there north it's 1A, 1B and 1C. If there's an appropriate place to have an exit 0, that's it.

[drummer_evans_aki]

I just want one of those signs. Exit 0 "My House"

[mukade]

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

Well, I-265 in Indiana also has an Exit 0 also, but that Exit 0 on I-164 that is shown will not be part of I-69, so I-69 will lose exit 0. Current exit 0 on I-69 in Indianapolis will eventually be exit 184.

[Road Hog]

The Dora exit on I-40 at the Arkansas-Oklahoma state line is Exit 330 in Oklahoma and Exit 1 in Arkansas. 

[rarnold]

I-380 has Exits 0A and 0B at its junction with I-80 west of Iowa City, Iowa. US 218/IA 27 continue south from that point, so that may explain the Exit 0 in this instance.

[PurdueBill]

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

Well, I-265 in Indiana also has an Exit 0 also, but that Exit 0 on I-164 that is shown will not be part of I-69, so I-69 will lose exit 0. Current exit 0 on I-69 in Indianapolis will eventually be exit 184.

Darn, that's right--it's going to become 169(?) from 164.  I wonder if it will still have an Exit 0 or if they will number it backwards so 0 is at the end that connects to 69.