3 di's

[hobsini2]

There's certain standards for exit lists that have to be followed. All destinations have to match what is on the BGS instead of what "should" be there, which is an opinion that can vary.

I would argue that if there is a sign along the route before the exit that says something like "Springfield EXIT 104" or "Allstate Arena EXIT 72" but it's not the "primary" control city on the exit sign, it should be in the note section. That was some of the stuff that I was adding. A lot of people use those wiki exit lists for POIs. I also think it is helpful to people to know things like US 151's exit off I-39/90/94 is locally called E Washington Ave despite it not being strictly a control city.

[ozarkman417]

I-470 is the reason that I lack an I-70 clinch in OH and WV. I took 470 in both directions, but I had no control over the route.

[1995hoo]

I-470 is the reason that I lack an I-70 clinch in OH and WV. I took 470 in both directions, but I had no control over the route.

I'm in a similar situation (although I'm also missing a short segment of I-70 in Columbus) and I plan to remedy that in October. I'm interested in going through the Wheeling Tunnel just to see that route anyway, and since the tunnel is closed westbound for construction I need to do it on the way home. Last time we went that way I consciously took I-470 due to a combination of traffic and construction and so far that's the only time I've been through that area. I typically opt for Corridor H and Corridor D instead.

[bing101]

I-495 is used in multiple states MA, NY, MD, VA, ME, DE


I-280 used in Multiple places CA, IL, IA, NJ, OH

I-680 Used in Nebraska, Iowa, California, Ohio

I-380 used in Iowa, California and Pennsylvania.

[GaryV]

I-275 exists in 6 states, although there are only 4 distinct routes.

[Scott5114]

There's certain standards for exit lists that have to be followed. All destinations have to match what is on the BGS instead of what "should" be there, which is an opinion that can vary.

I would argue that if there is a sign along the route before the exit that says something like "Springfield EXIT 104" or "Allstate Arena EXIT 72" but it's not the "primary" control city on the exit sign, it should be in the note section. That was some of the stuff that I was adding. A lot of people use those wiki exit lists for POIs.

Wikipedia is not meant to include all information. Whether or not it is helpful isn't the metric by which something is included. For instance, instructions for changing a tire would be helpful, but you can't make a Wikipedia page about that because that's not what the site is for. Generally, additional information found on other sign panels like this is okay to include, but if there's other information competing for that space editorial judgements have to be made on whether it's more important to note that an exit allows access to the West Brompfart Municipal Dog Park or that you can't get on there going westbound.

Without a link to a diff, I can't speak to the particulars of the situation.

I also think it is helpful to people to know things like US 151's exit off I-39/90/94 is locally called E Washington Ave despite it not being strictly a control city.

This is absolutely not okay if it's not actually on the sign. Relying on local usage is fraught with problems: do we have proof of that usage other than this editor's say-so? What percentage of the locals call it that? Is it only certain demographics (age, sex, race, income level) that call it that? Do we consider the usage of everyone in that municipality, or just people within a certain radius of the interchange? If the latter, what radius do we use? You end up needing a linguistic survey to ensure accuracy, and nobody's got the money for that.

[kphoger]

ain't nobody got time for that.

FTFY

[dvferyance]

I-470 is the reason that I lack an I-70 clinch in OH and WV. I took 470 in both directions, but I had no control over the route.

Speaking of I-470 it exist in 4 states would be 5 if Colorado hadn't screwed theirs up thanks frm Gov Lamm for that. I-270 exist in 5 states.

[thspfc]

So I-295 exists in nine states (ME, MA/RI, NY, NJ/DE, VA, NC, FL), making it the winner for most states. But another question: how many instances of max 3dis in a state are there? I-90 in NY technically does it, though I've heard that at least one of those 3dis (790 maybe?) is unsigned. I-80 in CA either does it or gets close. I-95 in MD gets really close, but oddly enough is missing 295, the most common 3di!
Any other examples?

[jmacswimmer]

So I-295 exists in nine states (ME, MA/RI, NY, NJ/DE, VA, NC, FL), making it the winner for most states. But another question: how many instances of max 3dis in a state are there? I-90 in NY technically does it, though I've heard that at least one of those 3dis (790 maybe?) is unsigned. I-80 in CA either does it or gets close. I-95 in MD gets really close, but oddly enough is missing 295, the most common 3di!
Any other examples?

There is actually an I-295 in MD, although just barely - Mostly exists in DC.

Additionally the DE/NJ I-295 now extends into PA, so does that mean I-295 actually exists in 11 states (12 if you include DC)?

[kkt]

I-80 in CA either does it or gets close.

Gets close. 

There is no I-180 because there is a state route 180 and California does not duplicate route numbers between state, U.S., and interstate systems.  However, the portion of I-580 from Albany to San Rafael may have been signed and marked on maps as I-180 for a short period in the late 1970s.  It was approved as I-180 by AASHTO, but rejected by California later and then approved as an extension of I-580 by AASHTO.

And there's now no I-480.  The Embarcadero Freeway in San Francisco was I-480 before its completion was blocked in the freeway revolt.  Then it was CA 480 for 20+ years until the 1989 earthquake damaged it so badly it was decided not to spend money to repair or replace it.

[michravera]

I-80 in CA either does it or gets close.

Gets close. 

There is no I-180 because there is a state route 180 and California does not duplicate route numbers between state, U.S., and interstate systems.  However, the portion of I-580 from Albany to San Rafael may have been signed and marked on maps as I-180 for a short period in the late 1970s.  It was approved as I-180 by AASHTO, but rejected by California later and then approved as an extension of I-580 by AASHTO.

And there's now no I-480.  The Embarcadero Freeway in San Francisco was I-480 before its completion was blocked in the freeway revolt.  Then it was CA 480 for 20+ years until the 1989 earthquake damaged it so badly it was decided not to spend money to repair or replace it.

Let's not forget that I-238 is a 3di of I-80. <duck!>

[kkt]

I-80 in CA either does it or gets close.

Gets close. 

There is no I-180 because there is a state route 180 and California does not duplicate route numbers between state, U.S., and interstate systems.  However, the portion of I-580 from Albany to San Rafael may have been signed and marked on maps as I-180 for a short period in the late 1970s.  It was approved as I-180 by AASHTO, but rejected by California later and then approved as an extension of I-580 by AASHTO.

And there's now no I-480.  The Embarcadero Freeway in San Francisco was I-480 before its completion was blocked in the freeway revolt.  Then it was CA 480 for 20+ years until the 1989 earthquake damaged it so badly it was decided not to spend money to repair or replace it.

Let's not forget that I-238 is a 3di of I-80. <duck!>

[ilpt4u]

I-80 in CA either does it or gets close.

Gets close. 

There is no I-180 because there is a state route 180 and California does not duplicate route numbers between state, U.S., and interstate systems.  However, the portion of I-580 from Albany to San Rafael may have been signed and marked on maps as I-180 for a short period in the late 1970s.  It was approved as I-180 by AASHTO, but rejected by California later and then approved as an extension of I-580 by AASHTO.

And there's now no I-480.  The Embarcadero Freeway in San Francisco was I-480 before its completion was blocked in the freeway revolt.  Then it was CA 480 for 20+ years until the 1989 earthquake damaged it so badly it was decided not to spend money to repair or replace it.

Let's not forget that I-238 is a 3di of I-80. <duck!>

Just add a "zero"  and make it the 1st 4di: I-2380

[kphoger]

A compromise:

I-238.0

[kkt]

It's been over 30 years since anyone drove on 480.  If CA did decide to fix I-238, they could number it I-480.

And I think they should, not so much because it's an orphan 3di, but because it doesn't directly connect with CA 238.

[michravera]

I-80 in CA either does it or gets close.

Gets close. 

There is no I-180 because there is a state route 180 and California does not duplicate route numbers between state, U.S., and interstate systems.  However, the portion of I-580 from Albany to San Rafael may have been signed and marked on maps as I-180 for a short period in the late 1970s.  It was approved as I-180 by AASHTO, but rejected by California later and then approved as an extension of I-580 by AASHTO.

And there's now no I-480.  The Embarcadero Freeway in San Francisco was I-480 before its completion was blocked in the freeway revolt.  Then it was CA 480 for 20+ years until the 1989 earthquake damaged it so badly it was decided not to spend money to repair or replace it.

Let's not forget that I-238 is a 3di of I-80. <duck!>

Just add a "zero"  and make it the 1st 4di: I-2380

It would even be a legitimate "Eastern" I-380. And it is possible (and was proposed back in the late 1960s and early 1970s) to have a "Southern Crossing" bridge roughly where I-380 would have hit The Bay. There are several good reasons that the bridge was never constructed. Not the least of which is that it would go through the deepest and widest part of The Bay. If all of that had hooked up, the I-238 numbering could have been handled within the currently defined system without any difficulty. I was one of the original proponents of 4dis. I-238 WB would have been I-2880 and EB would have been I-2580. If they ever get the whole thing constructed as freeway CASR-262 could do something similar. Of course, I-1080 and I-1180, etc could do the job just as well and would have an easier time fitting on existing shields.4

[kphoger]

It's been over 30 years since anyone drove on 480.  If CA did decide to fix I-238, they could number it I-480.

And I think they should, not so much because it's an orphan 3di, but because it doesn't directly connect with CA 238.

What do you mean it doesn't connect?

[TEG24601]

The Bay Area's numbering could easily be fixed with that pie-in-the-sky extension of I-70 that is bantered about.

[I-55]

The Bay Area's numbering could easily be fixed with that pie-in-the-sky extension of I-70 that is bantered about.

Or more realistically if US-101 became an I-1

[kkt]

It's been over 30 years since anyone drove on 480.  If CA did decide to fix I-238, they could number it I-480.

And I think they should, not so much because it's an orphan 3di, but because it doesn't directly connect with CA 238.

What do you mean it doesn't connect?

From I-238 eastbound you can take an exit to CA 238, but I-238 continues eastbound another few hundred yards before it joins with I-580.  CA 238 is not a simple extension of I-238, nor is I-238 a simple extension of CA 238.

The Bay Area's numbering could easily be fixed with that pie-in-the-sky extension of I-70 that is bantered about.

Or more realistically if US-101 became an I-1

It wouldn't be I-1 because CA 1 is an iconic route that the state would never change.  But US 101 could become I-3 at least from L.A. to S.F., which would require renumbering only a much less important and well-known route CA 3 in the NW end of the state.

I-70 to California is not just fictional, it's a wild fantasy.  Even if it were built for free, California would not want it built through the mountain wilderness areas and parks, nor would Caltrans have the budget to keep it open in the winter as you would expect of an interstate.  Nor would Nevada want to maintain interstate levels of maintenance on a route that barely justifies two lanes.

[kphoger]

It's been over 30 years since anyone drove on 480.  If CA did decide to fix I-238, they could number it I-480.

And I think they should, not so much because it's an orphan 3di, but because it doesn't directly connect with CA 238.

What do you mean it doesn't connect?

From I-238 eastbound you can take an exit to CA 238, but I-238 continues eastbound another few hundred yards before it joins with I-580.  CA 238 is not a simple extension of I-238, nor is I-238 a simple extension of CA 238.

meh

I think that's really splitting some hairs, there.

[bing101]

I-5 in California has spawned the most 3dis in different areas
I-105, I-205, I-305 (Signed as US-50), I-405, I-505, I-605, I-805, CA-905.

[thspfc]

I-5 in California has spawned the most 3dis in different areas
I-105, I-205, I-305 (Signed as US-50), I-405, I-505, I-605, I-805, CA-905.

I-90 in New York takes that title. 190, 290, and 990 in Buffalo, 390, 490, and 590 in Rochester, 690 in Syracuse, 790 in Utica, 890 in Schenectady for five different areas. I-10 in Texas, I-10 in Louisiana, I-40 in Tennessee, I-55 in Illinois, and I-75 in Michigan all have 3dis in three different areas, and there's probably others I'm missing in that category.

[Henry]

So I-295 exists in nine states (ME, MA/RI, NY, NJ/DE, VA, NC, FL), making it the winner for most states. But another question: how many instances of max 3dis in a state are there? I-90 in NY technically does it, though I've heard that at least one of those 3dis (790 maybe?) is unsigned. I-80 in CA either does it or gets close. I-95 in MD gets really close, but oddly enough is missing 295, the most common 3di!
Any other examples?

There is actually an I-295 in MD, although just barely - Mostly exists in DC.

Additionally the DE/NJ I-295 now extends into PA, so does that mean I-295 actually exists in 11 states (12 if you include DC)?

Of course, there's no I-995, and I-595 is unsigned along US 50 from the Beltway to Annapolis.

I-80 and I-90 (both E-W) have maxed out their 3di's, and due to Caltrans dragging its feet on the 905 thing, I-85 may very well be the first N-S 2di to max out its own 3di's, with the forthcoming I-885 in Durham and I-685 in Montgomery. With Montgomery, though, it would be a renumbering of the existing I-85, since it's slated to be rerouted onto a new southern bypass that may or may not be completed in our lifetimes.